WO2017167269A1

WO2017167269A1 - Filter optimisation method, filter configuration method, and related device and system

Info

Publication number: WO2017167269A1
Application number: PCT/CN2017/078992
Authority: WO
Inventors: 赵兆; 王奇; 龙毅; 郭志恒; 程型清; 龚希陶; 舒尔曼·麦塔
Original assignee: 华为技术有限公司
Priority date: 2016-03-31
Filing date: 2017-03-31
Publication date: 2017-10-05
Also published as: CN107294895B; CN107294895A

Abstract

Disclosed are a filter optimisation method, a filter configuration method, and a related device and system. The filter optimisation method comprises: according to a target adjacent channel leakage ratio requirement, determining a transmitting filter coefficient g^(o) _RX(t) satisfying the target adjacent channel leakage ratio requirement; according to a set channel statistic property H and g^(o) _RX(t) satisfying the target adjacent channel leakage ratio requirement, analysing a preferred receiving filter coefficient γ^(o) _RX(t) maximising a signal-to-interference-plus-noise ratio SINR_RX of a receiving end; using a known window function to approximate the preferred receiving filter coefficient γ^(o) _RX(t) to obtain a receiving filter coefficient γ⁽¹⁾ _RX(t) similar to the preferred receiving filter coefficient γ^(o) _RX(t), wherein the receiving filter coefficient γ⁽¹⁾ _RX(t) is used for configuring a filter at the receiving end. The solution can improve a signal-to-interface-plus-noise ratio, and improve the communication performance.

Description

Filter optimization method, filter configuration method, related equipment and system

This application claims the priority of the Chinese patent application filed on March 31, 2016, the Chinese Patent Office, the application number is 201610201208.9, and the invention name is "filter optimization method, filter configuration method, related equipment and system". This is incorporated herein by reference.

Technical field

The present invention relates to the field of communications, and in particular, to a filter optimization method, a filter configuration method, related devices, and systems.

Background technique

The Orthogonal Frequency Division Multiplexing (OFDM) system is the most widely used communication system in recent years, for example, a Long Term Evolution (LTE) system.

Compared with the LTE communication system, the next-generation communication system not only needs to improve the performance, but also needs to support the new service type through the design of the new air interface. That is to say, based on the traditional Mobile BroadBand (MBB) service, it also needs to support Machine-To-Machine (M2M), Man-Compute-Communication (MCC), and other rich and varied new technologies. Increased services, such as Ultra-reliable and Low Latency Communications (uMTC) and Massive Machine Type Communications (MMTC). The new air interface technology includes multiple dimensions of coding, waveform, multiple access and frame structure. Among them, waveform technology is the key link to achieve multi-service flexible support, which is very important for the new air interface of 5G system.

Due to the Cyclic Prefix (CP)-based Orthogonal Frequency Division Multiplexing (OFDM) technology, that is, CP-OFDM, it has good anti-multipath interference capability and has good performance with various MIMO technologies. In terms of compatibility, the existing OFDM system usually adopts CP-OFDM as a specific scheme of multi-carrier waveform. However, the CP-OFDM system is fixed with a rectangular window for windowing, and has obvious defects in suppressing the Adjacent Channel Leakage Ratio (ACLR) and Out Of Band Emission (OOBE). A certain guard band needs to be reserved to suppress interference between adjacent time-frequency resource blocks caused by different services or channel shapes.

Summary of the invention

Embodiments of the present invention provide a filter optimization method, a filter configuration method, a related device and a system, which can improve a signal to interference and noise ratio, improve communication performance, and support different communication scenarios.

In a first aspect, an embodiment of the present invention provides a filter optimization method, where the method includes:

Determining a transmit filter coefficient that satisfies the target adjacent channel leakage ratio requirement according to a target adjacent channel leakage ratio requirement

According to the channel statistical characteristic H and the requirement of the target adjacent channel leakage ratio

Calculate the preferred receive filter coefficients that maximize the receiver signal to interference and noise ratio SINR _RX

Wherein, the channel statistical characteristic, the transmission filter coefficient g _TX (t), and the reception filter coefficient γ _RX (t) are variables that determine the signal-to-interference-and-noise ratio SINR _RX of the receiving end;

Approximating the preferred receive filter coefficients using a known window function

Obtaining the preferred receive filter coefficients

Approximate receive filter coefficient

Said

Used to configure the receiver filter.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, according to a channel statistical characteristic, H and satisfying the target adjacent channel leakage ratio requirement

include:

The preferred receiving filter coefficients that maximize the receiver signal to interference and noise ratio SINR _RX are obtained by the following algorithm.

Where g _TX (t) is equal to

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the method further includes:

According to the channel statistical property H and the

Calculating a preferred transmit filter coefficient that maximizes the transmit signal to interference and noise ratio SINR _TX

The channel statistical characteristic, the transmit filter coefficient g _TX (t), and the receive filter coefficient γ _RX (t) are variables that determine the transmit signal to interference and noise ratio SINR _TX ;

Approximating the preferred transmit filter coefficients using known window functions

Obtaining the preferred transmit filter coefficients

Approximate transmit filter

Said

Used to configure the transmitter filter.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect,

include:

The preferred transmit filter coefficients that maximize the transmit signal to interference and noise ratio SINR _TX are obtained by the following algorithm.

Where γ _RX (t) is equal to

With reference to the first aspect, or the first possible implementation of the first aspect, or the second possible implementation of the first aspect, or the third possible implementation of the first aspect, in the first aspect Of the four possible implementations, the resulting received filter coefficients are obtained

Approximate receive filter coefficient

After that, it also includes:

The transmission filter coefficients g _TX (t) and the reception filter coefficients γ _RX (t) are progressively optimized by an iterative optimization process; wherein:

In the (i+1)th round, the preferred receive filter coefficients are calculated by the following algorithm.

Where g _TX (t) is equal to

Is the preferred transmit filter coefficient obtained in the ith round

Approximate transmit filter coefficients,

Is a preferred transmit filter coefficient calculated in the ith round to maximize the transmit signal to interference and noise ratio SINR _TX ;

Or, in the (i+1)th round, the preferred transmit filter coefficients are calculated by the following algorithm.

Where γ _RX (t) is equal to

Is the preferred receive filter coefficient obtained in the ith round

Approximate receive filter coefficients,

Is a preferred receive filter coefficient calculated in the ith round to maximize the receive signal to interference and noise ratio SINR _RX ; where i is a positive integer.

With reference to the first aspect, or the first possible implementation of the first aspect, or the second possible implementation of the first aspect, or the third possible implementation of the first aspect, or the first aspect In a fourth possible implementation manner of the first aspect, the receiving filter coefficient g _TX (t) and the transmitting filter coefficient γ _RX (t) are all defined by a predefined pulse parameter. Characterization

The pulse parameter includes: all or part of a preset parameter set; the preset parameter set includes: a first flag position Flag _head , a second flag bit Flag _tail , a first value N ₁ , a second value N ₂ , a pulse The shape P _type and the length K of the pulse to be configured with respect to a single symbol period. The first flag Flag _{head is} used to indicate whether the symbol header is pulse-formed, the second flag Flag _{tail is} used to indicate whether the symbol tail is pulse-formed, and the first value N _{1 is} used to indicate a single The number of sampling points in the symbol which are pulse-formed and whose amplitude weight is not equal to 1, and the second value N _{2 is} used to indicate the number of sampling points for pulse shaping outside a single symbol; the pulse shape P _{type is} used to indicate The shape of the pulse to be configured.

In a second aspect, an embodiment of the present invention provides a filter configuration method, where the method is applied to a base station side, including:

If the current communication scenario belongs to a preset communication scenario that requires pulse shaping processing, the base station determines a pulse to be configured for the current communication scenario; the pulse to be configured is characterized by a set of pulse parameters;

Receiving configuration information sent by the terminal device, where the configuration information is used to indicate a pulse shape supported by the terminal device;

And if the configuration information indicates that the terminal device supports the pulse to be configured, and determines that a pulse shaping process needs to be performed on the terminal device side, notifying the pulse parameter of the pulse to be configured to the terminal device; And configuring a filter coefficient of the terminal device.

In conjunction with the second aspect, in a first possible implementation manner of the second aspect, the performing the pulse forming process on the terminal device side includes:

In the uplink transmission process, pulse modulation needs to be performed at the transmitting end; or, in the downlink transmission process, pulse modulation needs to be performed at the receiving end;

The pulse parameter is used to configure a filter coefficient of the terminal device, including:

In the uplink transmission process, the pulse parameter of the pulse to be configured is used to configure the transmission filter of the terminal device; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used to configure the reception filter of the terminal device.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the method further includes: if it is determined that the pulse forming process needs to be performed on the base station side, Determining a pulse parameter of the configuration pulse, configuring a filter coefficient of the base station side; the pulse parameter is used to configure a filter coefficient of the base station.

In conjunction with the second possible implementation of the second aspect, in a third possible implementation of the second aspect, the performing the pulse forming process on the base station side includes:

In the uplink transmission process, pulse modulation needs to be performed at the receiving end; or, in the downlink transmission process, pulse modulation needs to be performed at the transmitting end;

The pulse parameter is used to configure a filter coefficient of the base station, including:

In the uplink transmission process, the pulse parameter of the pulse to be configured is used to configure the receiving filter coefficient of the base station; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used to configure the transmission filter coefficient of the base station.

In conjunction with the first possible implementation of the second aspect, or the third possible implementation of the second aspect, in a fourth possible implementation of the second aspect, the determining is required to perform a pulse at the transmitting end Modulation, including:

Whether it is necessary to perform pulse modulation at the transmitting end according to at least one of a service type of the transmission service, a preset requirement of the communication scenario, and an overhead of the guard band.

With reference to the first possible implementation of the second aspect, or the third possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the determining is required to perform a pulse at the receiving end Modulation, including:

Whether or not pulse modulation is required at the receiving end is determined according to at least one of the demodulation performance of the receiving end, the encoding of the signal, and the order of modulation.

With reference to the second aspect, or the first possible implementation of the second aspect, or the second possible implementation of the second aspect, or the third possible implementation of the second aspect, or the second aspect In a fourth possible implementation manner of the second aspect, the fourth possible implementation manner of the second aspect, the notifying the pulse parameter of the pulse to be configured to the terminal Equipment, including:

Notifying the terminal device to the terminal device by using dynamic signaling with a fixed period; or

The pulse parameters are notified to the terminal device by real-time dynamic signaling.

With reference to the sixth possible implementation of the second aspect, in a seventh possible implementation manner of the second aspect, the signaling carries a pulse parameter of the to-be-configured pulse; or the signaling carries the The indication of the pulse to be configured.

With reference to the second aspect, or the first possible implementation of the second aspect, or the second possible implementation of the second aspect, or the third possible implementation of the second aspect, or the second aspect The four possible implementations, or the fifth possible implementation of the second aspect, or the sixth possible implementation of the second aspect, or the seventh possible implementation of the second aspect, in the second aspect In an eighth possible implementation manner, the preset communication scenario that requires pulse shaping processing includes at least one of the following:

The current communication scenario belongs to a preset scenario that needs to limit out-of-band power leakage, the terminal device is scheduled to be at a resource edge where different OFDM setting parameters coexist, and the terminal device adopts a high-order modulation or a high-order modulation and coding strategy. The current time-frequency fading of the terminal device reaches a preset level, and the resource location corresponding to the terminal device is at the frame header and/or the end of the data frame, and the physical channel currently in which the terminal device is located is a preset requirement. Pulse shaped physical channel; The OFDM setup parameters include a cyclic prefix length and a subcarrier width.

With reference to the second aspect, or the first possible implementation of the second aspect, or the second possible implementation of the second aspect, or the third possible implementation of the second aspect, or the second aspect The four possible implementations, or the fifth possible implementation of the second aspect, or the sixth possible implementation of the second aspect, or the seventh possible implementation of the second aspect, or the second aspect The ninth possible implementation manner of the second aspect, the pulse parameter includes: all or part of a preset parameter set; the preset parameter set includes: a first flag bit Flag _head , a second flag, a _tail value, a first value N ₁ , a second value N ₂ , a pulse shape P _type, and a length K of the pulse to be configured with respect to a single symbol period. The first flag Flag _{head is} used to indicate whether the symbol header is pulse-formed, the second flag Flag _{tail is} used to indicate whether the symbol tail is pulse-formed, and the first value N _{1 is} used to indicate a single The number of sampling points in the symbol which are pulse-formed and whose amplitude weight is not equal to 1, and the second value N _{2 is} used to indicate the number of sampling points for pulse shaping outside the single symbol, and the pulse shape P _{type is} used to indicate The shape of the pulse to be configured.

In a third aspect, an embodiment of the present invention provides a filter configuration method, where the method is applied to a terminal device side, including:

Sending configuration information to the base station, where the configuration information is used to indicate a pulse shape supported by the terminal device;

Receiving a pulse parameter of the to-be-configured pulse notified by the base station;

The filter coefficients are configured according to the pulse parameters of the pulse to be configured.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the receiving, by the receiving base station, the pulse parameter of the to-be-configured pulse includes:

Receiving dynamic signaling with a fixed period sent by the base station, where the dynamic signaling with a fixed period is used to notify the pulse parameter of the to-be-configured pulse; or

Receiving real-time dynamic signaling sent by the base station, where the real-time dynamic signaling is used to notify the pulse parameters of the to-be-configured pulse.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the signaling carries a pulse parameter of the to-be-configured pulse; or the signaling carries the The indication of the pulse to be configured.

With reference to the third aspect, or the first possible implementation manner of the third aspect, or the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the terminal device supports The pulse shape is used to indicate whether the terminal device supports the to-be-configured pulse corresponding to the current communication scenario; the current communication scenario belongs to a preset communication scenario that requires pulse shaping processing.

With reference to the third aspect, or the first possible implementation of the third aspect, or the second possible implementation of the third aspect, or the third possible implementation of the third aspect, in the third aspect In four possible implementation manners, the preset communication scenario that requires pulse shaping processing includes at least one of the following:

In a fourth aspect, an embodiment of the present invention provides a communication network device, where the network device includes:

a determining unit, configured to determine a transmit filter coefficient that meets the target adjacent channel leakage ratio requirement according to a target adjacent channel leakage ratio requirement

a first calculating unit, configured to: according to a channel statistical characteristic H and satisfying the target adjacent channel leakage ratio requirement

a first approximation unit for approximating the preferred receive filter coefficients using a known window function

Obtaining the preferred receive filter coefficients

Approximate receive filter coefficient

Said

Used to configure the receiver filter.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the first calculating unit is specifically configured to:

Where g _TX (t) is equal to

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the method further includes:

a second calculating unit, configured to calculate the characteristic H according to the channel and the

The channel statistics characteristic, the transmit filter coefficient g _TX (t), and the receive filter coefficient γ _RX (t) are variables that determine the transmit signal to interference and noise ratio SINR _TX ;

a second approximation unit for approximating the preferred transmit filter coefficients using a known window function

Obtaining the preferred transmit filter coefficients

Approximate transmit filter

Said

Used to configure the transmitter filter.

In conjunction with the second possible implementation of the fourth aspect, in a third possible implementation manner of the fourth aspect, the second calculating unit is specifically configured to:

Where γ _RX (t) is equal to

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, or the third possible implementation manner of the fourth aspect, in the fourth aspect The four possible implementation manners further include: an iterative optimization unit, configured to: progressively optimize the transmit filter coefficient g _TX (t) and the receive filter coefficient γ _RX (t) through an iterative optimization process; among them:

Where g _TX (t) is equal to

Is the preferred transmit filter coefficient obtained in the ith round

Approximate transmit filter coefficients,

Where γ _RX (t) is equal to

Is the preferred receive filter coefficient obtained in the ith round

Approximate receive filter coefficients,

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, or the third possible implementation manner of the fourth aspect, or the fourth aspect In a fourth possible implementation manner of the fourth aspect, the receive filter coefficient g _TX (t) and the transmit filter coefficient γ _RX (t) are all defined by a predefined pulse Parameter characterization

In a fifth aspect, an embodiment of the present invention provides a base station, where the base station includes:

a determining unit, configured to: if the current communication scenario belongs to a preset communication scenario that requires pulse shaping processing, the base station determines a pulse to be configured for the current communication scenario; the pulse to be configured is characterized by a set of pulse parameters;

a receiving unit, configured to receive configuration information sent by the terminal device, where the configuration information is used to indicate a pulse shape supported by the terminal device;

a determining unit, configured to determine, according to the configuration information, whether the terminal device supports the pulse to be configured, and determine whether a pulse shaping process needs to be performed on the terminal device side;

a notification unit, configured to notify the terminal device of the pulse parameter of the pulse to be configured if the configuration information indicates that the terminal device supports the pulse to be configured, and determines that a pulse shaping process needs to be performed on the terminal device side; The pulse parameter is used to configure a filter coefficient of the terminal device.

In conjunction with the fifth aspect, in a first possible implementation manner of the fifth aspect, the performing the pulse forming process on the terminal device side includes:

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, the second possible implementation manner of the fifth aspect, further includes: a configuration unit, configured to perform pulse shaping on the base station side if it is determined Processing, configuring, according to the pulse parameter of the pulse to be configured, a filter coefficient of the base station side; the pulse parameter is used to configure a filter coefficient of the base station.

In conjunction with the second possible implementation of the fifth aspect, in the three possible implementation manners of the fifth aspect, the performing the pulse forming process on the base station side includes:

With reference to the first possible implementation manner of the fifth aspect, or the third possible implementation manner of the fifth aspect, in the four possible implementation manners of the fifth aspect, the determining module is specifically configured to: according to the transmission service At least one of the service type, the preset requirement of the communication scenario, and the overhead of the guard band determines whether it is required to perform pulse modulation at the transmitting end.

With reference to the first possible implementation of the fifth aspect, or the third possible implementation manner of the fifth aspect, in the five possible implementation manners of the fifth aspect, the determining module is specifically configured to: according to the receiving end At least one of the demodulation performance, the encoding of the signal, and the order of the modulation is used to determine whether pulse modulation is required at the receiving end.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, or the second possible implementation manner of the fifth aspect, or the third possible implementation manner of the fifth aspect, or the fifth aspect The four possible implementation manners, or the fifth possible implementation manner of the fifth aspect, in the six possible implementation manners of the fifth aspect, the notification unit is specifically configured to:

With reference to the sixth possible implementation manner of the fifth aspect, in a seventh possible implementation manner of the fifth aspect, the signaling carries a pulse parameter of the to-be-configured pulse; or the signaling carries the The indication of the pulse to be configured.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, or the second possible implementation manner of the fifth aspect, or the third possible implementation manner of the fifth aspect, or the fifth aspect Four possible implementations, or a fifth possible implementation of the fifth aspect, or a sixth possible implementation of the fifth aspect, Or the seventh possible implementation manner of the fifth aspect, in the eight possible implementation manners of the fifth aspect, the preset communication scenario that needs to perform pulse shaping processing includes at least one of the following:

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, or the second possible implementation manner of the fifth aspect, or the third possible implementation manner of the fifth aspect, or the fifth aspect The four possible implementation manners, or the fifth possible implementation manner of the fifth aspect, or the sixth possible implementation manner of the fifth aspect, or the seventh possible implementation manner of the fifth aspect, or the fifth aspect The eighth possible implementation manner, in the nine possible implementation manners of the fifth aspect, the pulse parameter includes: all or part of a preset parameter set; the preset parameter set includes: a first flag bit Flag _{A head} , a second flag, a _tail value, a first value N ₁ , a second value N ₂ , a pulse shape P _type, and a length K of the pulse to be configured with respect to a single symbol period. The first flag Flag _{head is} used to indicate whether the symbol header is pulse-formed, the second flag Flag _{tail is} used to indicate whether the symbol tail is pulse-formed, and the first value N _{1 is} used to indicate a single The number of sampling points in the symbol which are pulse-formed and whose amplitude weight is not equal to 1, and the second value N _{2 is} used to indicate the number of sampling points for pulse shaping outside the single symbol, and the pulse shape P _{type is} used to indicate The shape of the pulse to be configured.

In a sixth aspect, an embodiment of the present invention provides a terminal device, where the terminal device includes:

a sending unit, configured to send configuration information to the base station, where the configuration information is used to indicate a pulse shape supported by the terminal device;

a receiving unit, configured to receive a pulse parameter of the to-be-configured pulse notified by the base station;

And a configuration unit, configured to configure a filter coefficient according to the pulse parameter of the pulse to be configured.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the receiving unit is specifically configured to:

In conjunction with the sixth aspect, in a second possible implementation manner of the sixth aspect, the signaling carries a pulse parameter of the to-be-configured pulse; or the signaling carries indication information of the to-be-configured pulse.

With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, or the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the terminal device supports The pulse shape is used to indicate whether the terminal device supports the to-be-configured pulse corresponding to the current communication scenario; the current communication scenario belongs to a preset communication scenario that requires pulse shaping processing.

Combining the sixth aspect, or the first possible implementation of the sixth aspect, or the second possible aspect of the sixth aspect The implementation manner of the sixth aspect, or the third possible implementation manner of the sixth aspect, in the fourth possible implementation manner of the sixth aspect, the preset communication scenario that needs to perform pulse shaping processing includes at least one of the following:

In a seventh aspect, an embodiment of the present invention provides a communication network device, where the communication network device includes a functional unit for performing some or all of the steps of any implementation manner of the first aspect of the embodiments of the present invention.

In an eighth aspect, an embodiment of the present invention provides a base station, where the base station includes a functional unit for performing some or all of the steps of any implementation manner of the second aspect of the embodiment of the present invention.

A ninth aspect, the embodiment of the present invention provides a terminal device, where the terminal device includes a functional unit for performing some or all of the steps of any implementation manner of the third aspect of the embodiment of the present invention.

In an eighth aspect, an embodiment of the present invention provides a communication system, where the system includes: a base station and a terminal device, where:

The base station is the base station described in the fifth aspect or the eighth aspect;

The terminal device described in the sixth or ninth aspect of the terminal device.

By implementing the filter optimization method provided by the embodiments of the present invention, a preferred receive filter coefficient or a preferred transmit filter coefficient is obtained by maximizing the receive signal to interference and noise ratio, and the known window function is used to approximate the preferred Receive filter coefficients or preferred transmit filter coefficients, which can improve the dry-to-noise ratio and improve the demodulation performance. By implementing the filter configuration method provided by the embodiments of the present invention, in a preset communication scenario requiring pulse shaping processing By configuring the filter of the transmitting end and/or the receiving end by the pulse parameter of the pulse to be configured, the communication performance of the entire communication system can be improved, for example, reducing out-of-band power leakage, improving signal to interference and noise ratio, reducing interference, and the like.

DRAWINGS

In order to more clearly illustrate the technical solutions of the present application, the drawings used in the description of the embodiments will be briefly described below.

1A-1F are schematic diagrams of several possible application scenarios involved in an embodiment of the present invention;

2 is a schematic flowchart of a filter optimization method according to an embodiment of the present invention;

3 is a schematic flowchart of a filter optimization method according to an embodiment of the present invention;

4 is a schematic diagram of an example of a waveform of a transceiver filter according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a filter configuration method according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a communication network device according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure;

9 is a schematic structural diagram of a transmitter according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of an implementation block diagram of a transmitter according to an embodiment of the present invention; FIG.

11 is a schematic diagram of another implementation block diagram of a transmitter according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a receiver according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of an implementation block diagram of a receiver according to an embodiment of the present invention; FIG.

FIG. 14 is a schematic diagram of another implementation block diagram of a receiver according to an embodiment of the present invention.

detailed description

The terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

First, several possible application scenarios involved in the embodiments of the present invention are introduced in conjunction with FIG. 1A-1F. details as follows:

As shown in FIG. 1A, in an application scenario of an enhanced mobile broadband (eMBB) service, an extended sub-band multicast/multicast single frequency network (Multimedia Broadcast) is usually adopted for more flexible resource configuration. Multicast service Single Frequency Network, MBSFN). Since multicast/multicast requires signal coverage enhancement, the MBSFN and single cell transmission channels use different OFDM Numerologies (ie, a set of values set by the CP length and subcarrier width of OFDM) for data transmission. For example, MBSFN in existing systems uses an extended CP to combat longer channel delay times. In the case where a plurality of OFDM Numerologies coexist, the communication system can effectively limit out-of-band leakage by pulse shaping processing, reduce interference between resource blocks, and reduce the overhead of the guard band.

As shown in FIG. 1B, during resource scheduling, user equipments (UEs) of different OFDM Numerologies are allocated to different locations of resource blocks. Users in the resource block sideband (or nearby) typically experience severe sub-band interference compared to users who are inside the resource block (ie, not near the sideband). For users of the resource block sideband (or nearby), the pulsed processing can be used to reduce the interference experienced by the user.

As shown in FIG. 1C, the communication system adjusts the Modulation and Coding Scheme (MCS) in real time according to the channel quality information. It can be understood that the higher the modulation order, the higher the signal to noise ratio requirement of the transmission signal. Under the high-order modulation and coding strategy, the pulse-forming process can achieve a better signal-to-noise ratio for the transmission signals of higher modulation orders.

As shown in FIG. 1D, the existing CP-OFDM has certain advantages in combating certain frequency selective channels (the channel delay spread length is less than the CP length), but if severe time-frequency fading occurs, the instantaneous offset and the channel delay spread length If the signal is larger than CP or Doppler frequency offset/phase noise is strong, the communication performance is seriously attenuated. Under such channel conditions, the reliability of signal transmission can be improved by pulse shaping processing.

As shown in FIG. 1E, the flexible handover self-completed Time Division Duplexing (TDD) frame structure has attracted widespread attention in 5G communication research. The self-completed TDD frame structure technology can implement fast switching between uplink and downlink transmission and acknowledgment in the same TDD frame, which can effectively reduce transmission delay and provide flexibility for flexible frame structure design. In general, the position of a symbol in such a frame structure can be defined into four shapes: a frame header (type 1), a frame tail (type 2), a frame header and a frame tail (type 3), and a frame interior (type 4). For symbols at the beginning and/or the end of the frame, the interference due to channel attenuation, non-synchronization, and time-domain jitter can be reduced by pulse shaping processing.

As shown in FIG. 1F, different physical channels coexist, for example, a physical random access channel (PRACH) and a physical uplink shared channel (PUSCH) coexist, wherein PRACH is required compared to PUSCH. Supports long multipath delay spread and high anti-asynchronization capability. Therefore, for PRACH, the robustness against symbol-level time offset can be achieved by pulse shaping processing. For example, the pulse length corresponding to the filter is equivalent to a plurality of symbol periods.

It should be noted that the embodiment of the present invention may also be directed to other communication scenarios that need to improve communication performance, and details are not described herein.

It should be noted that the pulse shaping according to the embodiment of the present invention refers to subcarrier level filtering (ie, filtering for subcarriers) that satisfies the transmission signal s(t) described in the following formula in an OFDM system, or OFDM signal. Pulse shaping:

s(t)=∑ _m ∑ _n a _m,n g _TX (t-nT) ^2πjmFT

Where s(t) is the transmission signal of the OFDM system, a _m,n is the data on the mth subcarrier and the nth symbol, T is the OFDM symbol period, F is the subcarrier spacing of OFDM, and g _TX is the transmitting end Waveform or (prototype) sends a pulse. G _TX waveform and the receiving side or opposite (prototype) the received pulse can be expressed γ _RX. In the existing CP-OFDM system, the transmitting end waveform g _TX and the receiving end waveform γ _RX are fixed to a rectangular shape by default.

In order to solve the problem that the existing OFDM communication system is subjected to pulse shaping by using a rectangular window, the embodiment of the present invention provides a filter optimization method, a filter configuration method, a related device, and a system, which can be optimized by Configuration to improve communication performance to support different communication scenarios. The filter optimization method, the filter configuration method, the related device and the system provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

2 is a schematic flowchart of a filter optimization method according to an embodiment of the present invention. As shown in Figure 2, the method includes:

S101. Determine, according to a target adjacent channel leakage ratio requirement, a transmit filter coefficient that meets the target adjacent channel leakage ratio requirement.

S103, according to the channel statistical characteristic H and satisfying the requirement of the target adjacent channel leakage ratio

The channel statistical characteristic, the transmission filter coefficient g _TX (t), and the reception filter coefficient γ _RX (t) are variables that determine the signal-to-interference-and-noise ratio SINR _RX of the receiving end.

S105, approximating the preferred receiving filter coefficients by using a known window function

Obtaining the preferred receive filter coefficients

Approximate receive filter coefficient

Said

Used to configure the receiver filter.

In the embodiment of the present invention, the transmission filter coefficients g _TX (t) and the reception filter coefficients γ _RX (t) may all be characterized by predefined pulse parameters. The pulse parameter includes all or part of a preset parameter set.

Specifically, the preset parameter set may be as shown in Table 1:

Table 1

Where α denotes the roll-off coefficient of the Raised Cosine (RC) filter; N _CP is the length of the OFDM cyclic prefix, and N _sym is the number of sampling points corresponding to a single symbol period. It should be noted that Table 1 is only an implementation manner of the embodiment of the present invention, and may be different in practical applications, and should not be construed as limiting.

In the embodiment of the present invention, the preset parameter set may also include some system predefined OFDM parameters, such as N _CP and N _sym , or other parameters, which are not limited herein.

As described in "Definitions" in Table 1, the first flag Flag _head can be used to indicate whether the symbol header is pulse-formed, and the second flag Flag _tail can be used to indicate whether the symbol tail is pulse-formed, and the first value N _{1 is} available. The number of sampling points indicating pulse shaping and amplitude weight not equal to 1 in a single symbol, the second value N ₂ may be used to indicate the number of sampling points for pulse forming outside a single symbol, and P _type may be used to indicate a pulse to be configured. The shape, K, can be used to indicate the length of the pulse to be configured relative to a single symbol period.

In some possible implementations, if the first flag Flag _head is equal to the first enable value, the first flag Flag _head indicates that the symbol header is pulse-formed, otherwise the symbol header is not pulse-formed. . For example, as shown in Table 1, the first flag bit Flag _head is a 1-bit flag bit, and the first enable value is 1. Then, when the Flag _head is equal to 1, it indicates that the symbol head is pulse-formed; when the Flag _head is equal to 0, it indicates that the symbol header is not pulse-formed. The example is only one embodiment of the embodiment of the present invention, and may be different in practical applications, and should not be construed as limiting.

Similarly, in some possible implementations, if the second flag bit _tail is equal to the second enable value, the second flag bit Flag _tail indicates that the symbol tail is pulse-formed, otherwise the symbol tail is not pulsed. forming.

It should be noted that the first enable value and the second enable value may be defined according to actual requirements, and are not limited herein.

In the embodiment of the present invention, a set of pulse parameters, such as (N _CP , N ₁ , N ₂ ), can correspondingly characterize a specific pulse shape, that is, a filter coefficient (also referred to as a shape factor of a filter). Also, the performance of a filter is usually determined by the shape of the pulse corresponding to the filter. Therefore, a filter with a better pulse shape tends to have better ability to limit out-of-band power leakage, improve signal-to-noise ratio, and the like.

The optimization process of the reception filter coefficients and the transmission filter coefficients will be described in detail below from two aspects.

In the first aspect, regarding the optimization process of the reception filter coefficients: in the case where the transmission filter coefficients are determined, the reception filter coefficients can be optimized mainly for the purpose of maximizing the reception side signal to interference and noise ratio SINR _RX . as follows:

Specifically, the preferred receiving filter coefficient that maximizes the receiver signal to interference and noise ratio SINR _RX

It can be represented by the following algorithm:

The channel statistical characteristics, such as delay spread and Doppler frequency offset, may be characterized by a channel scatter function H; the receive signal to interference and noise ratio SINR _RX may be a channel statistic characteristic H, a transmit filter coefficient g _TX ( t), and the reception filter coefficient γ _RX (t) is determined as SINR _RX {H, g _TX (t), γ _RX (t)}.

It can be understood that the adjacent channel leakage ratio ACLR is related to the transmission filter coefficient g _TX (t), which can be expressed here.

Therefore, for target adjacent channel leakage ratio requirements, for example

Can solve the problem that meets this requirement

In a specific implementation, the base station may select a set of pulse parameters that meet the target adjacent channel leakage ratio requirement from the pulse parameter table corresponding to the known window function to represent

For example, the pulse parameter table corresponding to the raised cosine window function can be as shown in Table 2 (Flag _tail =1, Flag _head =1), wherein Table 2 provides several CP lengths and their corresponding N ₁ and N ₂ ranges.

N_CP N _CP	N₁ N ₁	N₂ N ₂
3636	12～1612 to 16	12～1412~14
7272	30～3230~32	24～3024~30
144144	60～6460~64	40～6040~60

Table 2

It should be noted that Table 2 is only used to explain the embodiments of the present invention and should not be construed as limiting.

In the solution process of the above algorithm 1, since the channel statistical property H is known, and the transmission filter coefficient g _TX (t) is equal to

Therefore, it is possible to solve the problem that satisfies the above algorithm.

That is, under the conditions of the transmission filter and the determined channel characteristics, can be theoretically obtained from the receiving end such that the maximum signal to interference noise ratio SINR _RX reception filter coefficients, i.e.,

For practical application of the theoretically calculated preferred receive filter coefficients (ie

), you can use the known window function to approximate the theoretical calculation

Finally obtained with the preferred receive filter coefficients

Approximate suboptimal receive filter coefficients

It is assumed that the known window function is a raised cosine (RC) filter. Then, it can be solved by the norm regularization method.

Suboptimal receive filter coefficients for infinite approximation

E.g

The example is only an implementation manner of the embodiment of the present invention, and may be solved by other algorithms in practical applications, and should not be construed as limiting.

The approximation can also be within a certain range of errors.

For example, as shown in FIG. 3, it is a transmission and reception filter waveform in a communication system whose channel characteristics are known. among them,

Is the raised cosine window function of the transmitting end, and the corresponding pulse parameters are: N1=0, N2=16;

Is the preferred receive filter coefficient obtained by the above algorithm 1;

Is approximated by a raised cosine window function

The resulting receive filter coefficients,

The corresponding pulse parameters are: N1=16, N2=0.

It should be noted that the known window function for approximating the preferred receiving filter coefficients in practical applications may also be a Gaussian window function, a rectangular window function, and the like, which are not limited herein.

In a second aspect, an optimization process for transmitting filter coefficients: according to the received filter coefficients

Further optimizing the transmit filter coefficient g _TX (t); specifically, at γ _RX (t) is equal to

In the case, mainly to maximize the transmission side transmits to optimize the signal to interference noise ratio SINR _TX filter coefficients for the purpose. as follows:

Specifically, a preferred transmit filter coefficient that maximizes the transmit signal to interference and noise ratio SINR _TX

It can be represented by the following algorithm two:

Therefore, the channel statistical property H is known, and the reception filter coefficient γ _RX (t) is equal to

Under the conditions, can solve the above algorithm

Similarly, the theoretically calculated transmit filter coefficients are calculated for practical application (ie

Finally obtaining the preferred transmit filter coefficients

Approximate transmit filter coefficient

Here you can

This is called the transmit filter coefficient. About getting

The method of approximation can be obtained by referring to the foregoing

The process is not repeated here.

Understandably,

Under the condition that the transmission filter g _TX (t) is determined, the maximum receiver signal to interference and noise ratio SINR _{RX can be obtained} , and the demodulation performance of the communication system is improved;

Can be implemented in the receive filter γ _RX (t) equal

Under the condition, the maximum transmit signal to interference and noise ratio SINR _{TX is obtained} , which further improves the demodulation performance of the communication system.

As shown in FIG. 4, the embodiment of the present invention can also progressively optimize the transmit filter coefficients g _TX (t) and the receive filter coefficients γ _RX (t) through an iterative optimization process. among them:

It is assumed that the i-th iteration is an optimization process for the transmission filter coefficient g _TX (t). In the ith round, the theoretically calculated preferred transmit filter coefficients are

The transmission filter coefficient obtained by approximate approximation using the actual window function is

Then, the (i+1)th iteration may be an optimization process for the reception filter coefficient γ _RX (t). Specifically include:

First, the preferred receive filter coefficients can be theoretically calculated by the following algorithm.

Where H is the predetermined channel statistical characteristic, and i is a positive integer;

Then, using known actual window functions, such as RC window functions, can be approximated by theoretical calculations.

Finally get the received filter coefficients

It can be inferred that the next i+2 round iteration can be a further optimization process for the transmit filter coefficients g _TX (t). Specifically include:

First, the preferred transmit filter coefficients can be theoretically calculated by the following algorithm.

Finally get the received filter coefficients

By analogy, the subsequent (after i+2 rounds) iterative process can be repeatedly performed with reference to the aforementioned (i+2th round) iterative process, which is not described here.

Implementing an embodiment of the present invention, obtaining a preferred receiving filter coefficient by maximizing the signal-to-interference-to-noise ratio of the receiving end under the condition that the transmission filter coefficient is known, and approximating the preferred receiving filter by using a known window function The coefficient is finally obtained, which is similar to the receiving filter coefficient which can be used to configure the receiving end filter, improves the signal-to-interference ratio of the receiving end, improves the demodulation performance, and then maximizes the transmission according to the optimized receiving filter coefficient. The signal-to-noise ratio is further obtained to obtain a preferred transmission filter coefficient, and the known transmission filter coefficient is approximated by a known window function, so that the transmission filter similar to the one that can be practically used for configuring the transmission end filter is configured. The coefficient further improves the signal to interference and noise ratio of the transmitting end and improves the demodulation performance.

A filter configuration method provided by an embodiment of the present invention will be described below. The filter configuration method can be used to configure the filter coefficients obtained by the filter optimization method corresponding to the embodiment of FIG. 2, that is, a set of pulse parameters characterizing the filter coefficients, to the filter. The filter configuration method will be described in detail below with reference to FIGS. 5-6.

FIG. 5 is a schematic flowchart diagram of a filter configuration method according to an embodiment of the present invention. As shown in FIG. 5, the method can include:

S201. If the current communication scenario belongs to a preset communication scenario that requires pulse shaping processing, the base station may determine a pulse to be configured for the current communication scenario.

S203. The terminal device sends configuration information to the base station, where the configuration information is used to indicate a pulse shape supported by the terminal device. Specifically, the pulse shape supported by the terminal device may include a raised cosine pulse, a Gaussian pulse, a rectangular pulse, and the like.

S205. Correspondingly, the base station receives the configuration information sent by the terminal device. And, the base station may determine, according to the configuration information, whether the terminal device supports the to-be-configured pulse, and determine whether a pulse shaping process needs to be performed on the terminal device side.

S207. If the base station determines that the terminal device supports the to-be-configured pulse, and determines that the pulse shaping process needs to be performed on the terminal device side, the base station may notify the terminal device of the pulse parameter of the to-be-configured pulse. Specifically, the pulse parameter can be used to configure a filter coefficient of the terminal device.

It can be understood that if the pulse shape supported by the terminal device is sufficient to cover the pulse shape that the base station may configure, the S203 is not a necessary step of the embodiment of the present invention. Accordingly, the base station does not need to determine the S205. Whether the terminal device supports the pulse to be configured.

It should be noted that S203 is not limited to S201. That is, the terminal device can send the configuration information to the base station at any time, and can be free from the limitation of the communication scenario in which the current communication scenario belongs to a preset pulse shaping process.

In the embodiment of the present invention, the preset communication scenario that needs to perform pulse shaping processing may include, but is not limited to, the communication scenario illustrated in FIGS. 1A-1F. Specifically, the communication scenario belongs to a preset scenario that needs to limit the out-of-band power leakage, and the terminal device is scheduled to coexist in different OFDM Numerologies (ie, a set of values set by the CP length and the subcarrier width of the OFDM). The edge and the terminal device adopt a high-order modulation or a high-order modulation and coding strategy, the current time-frequency fading of the terminal device reaches a preset level, and the resource location corresponding to the terminal device is at the frame header and/or the end of the data frame, and the terminal device currently The physical channel is one or more of a communication scenario such as a preset physical channel that requires pulse shaping.

It should be noted that, in an actual application, the preset scenario may also include other communication scenarios that require pulse shaping processing, which is not limited herein.

In the embodiment of the present invention, after determining that the current communication scenario needs to be pulse-formed, the base station may further determine whether it is necessary to perform pulse shaping processing on the transmitting end, or perform pulse shaping processing on the receiving end, or need to send and receive two The ends are pulsed.

In a possible implementation manner, the base station may determine whether it is necessary to perform pulse modulation at the receiving end according to the demodulation performance of the receiving end, the coding of the signal, the modulation order, and the like.

For example, if the demodulation performance of the receiving end is low, it is determined that pulse modulation needs to be performed at the receiving end to improve the signal to interference and noise ratio of the receiving end and improve the demodulation performance.

For another example, the higher the modulation order, the higher the signal-to-noise ratio requirement of the transmission signal. Therefore, if the modulation order of the signal is high, it can be determined that the pulse modulation needs to be performed at the receiving end to improve the signal to interference and noise ratio. To ensure transmission performance.

The example is only one implementation manner of the embodiment of the present invention, and may be different in practical applications, and should not be construed as limiting.

In a possible implementation manner, the base station may determine, according to the service type of the transmission service, the requirement of the communication scenario, the overhead of the protection band, etc., whether the pulse modulation needs to be performed at the transmitting end.

For example, if the transmission service is a uMTC service, it is determined that pulse modulation needs to be performed at the transmitting end to ensure the reliability of the transmitted signal.

For another example, if the current communication scenario belongs to the preset scenario that needs to be pulse modulated, it is determined that pulse modulation needs to be performed at the transmitting end to improve the communication performance of the current communication scenario.

For another example, if the overhead of the guard band between different users is large, it is determined that pulse modulation needs to be performed at the transmitting end to reduce the overhead of the guard band.

It should be noted that the base station may also determine at which end the pulse shaping process is required according to a predefined filter configuration strategy.

For example, multiple levels of out-of-band power leakage indicators are defined in advance; if the out-of-band power leakage in the current communication scenario is higher than the first leakage indicator (high leakage), it indicates that pulse forming processing needs to be performed at both ends of the transmitting and receiving, To minimize the out-of-band power leakage to ensure communication performance; if the out-of-band power leakage in the current communication scenario is within the second leakage index (moderate leakage), it indicates that pulse shaping processing is required at the transmitting end. It is used to reduce the interference of the transmitting end to other users; if the out-of-band power leakage in the current communication scenario is lower than the third leakage index (light leakage), it indicates that the pulse forming process can be performed only at the receiving end, and the other is reduced. User interference to the receiving end.

It should be noted that the base station may also determine that the pulse forming process needs to be performed at that end according to other strategies, which is not limited in the embodiment of the present invention.

It can be understood that, in the uplink transmission process, if it is determined that the pulse modulation needs to be performed on the transmitting end, it indicates that the terminal device side needs to perform pulse modulation, and the pulse parameter of the to-be-configured pulse can be used to configure the transmission filter of the terminal device; In the downlink transmission process, if it is determined that the pulse modulation needs to be performed at the receiving end, it also indicates that the pulse modulation needs to be performed on the terminal device side, and the pulse parameter of the pulse to be configured can be used to configure the receiving filter of the terminal device.

It can be understood that, in the uplink transmission process, if it is determined that the pulse modulation needs to be performed at the receiving end, it indicates that the channel modulation needs to be performed on the base station side, and the pulse parameter of the to-be-configured pulse can be used to configure the receiving filter of the base station; During the transmission process, if it is determined that the pulse modulation needs to be performed at the transmitting end, it also indicates that the pulse modulation needs to be performed on the base station side, and the pulse parameter of the pulse to be configured can be used to configure the transmission filter of the base station.

In the embodiment of the present invention, the pulse parameter may include all or part of a preset parameter set.

Specifically, the preset parameter set may refer to Table 1 in the embodiment of FIG. 2 and related content, and details are not described herein again.

In an embodiment of the invention, a set of pulse parameters corresponds to a particular pulse shape. As described in "Definitions" in Table 1, the first flag Flag _head can be used to indicate whether the symbol header is pulse-formed, and the second flag Flag _tail can be used to indicate whether the symbol tail is pulse-formed, and the first value N _{1 is} available. The number of sampling points indicating pulse shaping and amplitude weight not equal to 1 in a single symbol, the second value N ₂ may be used to indicate the number of sampling points for pulse forming outside a single symbol, and P _type may be used to indicate a pulse to be configured. The shape, K, can be used to indicate the length of the pulse to be configured relative to a single symbol period.

In the embodiment of the present invention, different communication scenarios that require pulse shaping processing may correspond to different pulses to be configured (ie, different pulse parameters). As shown in Table 3, it is necessary to limit the out-of-band leakage scenario corresponding to the pulse to be configured:

	N_CP N _CP	N₁ N ₁	N₂ N ₂
短CPShort CP	144144	20～7220～72	16～7216～72
长CPLong CP	512512	60～25660~256	40～25640~256

table 3

In an implementation manner, different communication scenarios for which the pulse shaping process is required may be performed by using a graph. The filter optimization method described in the embodiment obtains pulse parameters (ie, filter coefficients) of the pulses to be configured corresponding to the different communication scenarios.

In another implementation manner, for the different communication scenarios that need to perform pulse shaping processing, the to-be-configured pulses corresponding to the different communication scenarios may be preset.

For example, statically defining the to-be-configured pulse corresponding to the scenario that needs to limit the out-of-band leakage by the protocol is as shown in Table 2. The example is only one implementation manner of the embodiment of the present invention, and may be different in practical applications, and should not be construed as limiting.

In the embodiment of the present invention, the pulse parameters of the pulse to be configured may be notified to the terminal device by using the following implementation manners:

In a first implementation manner, the pulse parameter may be notified to the terminal device by using dynamic signaling with a fixed period, such as RRC signaling.

In a second implementation manner, the pulse parameters may be notified to the terminal device by using real-time dynamic signaling, such as scheduling signaling.

In the third implementation manner, the to-be-configured pulse corresponding to the different communication scenarios can be statically defined by the protocol. Therefore, the terminal device can know the parameters to be configured corresponding to the current communication scenario by determining the shape of the current communication scenario. For example, the pulse parameters shown in Table 3 are statically defined by the protocol, that is, used to characterize the to-be-configured pulse corresponding to the scene in which the out-of-band leakage needs to be restricted. The example is only one implementation manner of the embodiment of the present invention, and may be different in practical applications, and should not be construed as limiting.

In the embodiment of the present invention, if the terminal device is notified of the to-be-configured parameter by signaling, then:

In an implementation manner, the signaling parameter may be directly carried in the signaling; the terminal device may directly perform filter configuration according to the pulse parameter.

In another implementation manner, the signaling may also carry indication information of the pulse parameter; the terminal device needs to determine a pulse parameter indicated by the indication information according to the indication information, and further filter according to the pulse parameter. Configuration.

For example, the indication information of the pulse parameter is a pulse shape, wherein the pulse parameter corresponding to the pulse shape has been specified by a preset protocol; then, the terminal device can know the pulse parameter corresponding to the pulse shape according to the protocol.

For example, the indication information of the pulse parameter is an index of the pulse to be configured in a preset database, wherein the terminal device side can access the preset database; then, the terminal device can search from the preset database. The pulse parameter corresponding to the index.

In the embodiment of the present invention, in a communication scenario in which a pulse shaping process is required to be performed, a filter of a transmitting end and/or a receiving end is configured by a pulse parameter of a pulse to be configured, thereby improving communication performance of the entire communication system, for example, reducing Out-of-band power leakage, improved signal to noise ratio, reduced interference, and more.

FIG. 6 is a schematic structural diagram of a communication network device according to an embodiment of the present invention. The communication network device can be used to perform the filter optimization method described in the embodiment of FIG. 2. As shown in FIG. 6, the communication network device 60 may include a determining unit 601, a first calculating unit 603, and a first approximation unit 605, where:

a determining unit 601, configured to determine, according to a target adjacent channel leakage ratio requirement, a transmit filter coefficient that meets the target adjacent channel leakage ratio requirement

a first calculating unit 603, configured to: according to a channel statistical characteristic H and satisfying the target adjacent channel leakage ratio requirement

a first approximation unit 605 for approximating the preferred receive filter coefficients by using a known window function

Obtaining the preferred receive filter coefficients

Approximate receive filter coefficient

Said

Used to configure the receiver filter.

In the embodiment of the present invention, the pulse parameter may be all or part of a preset parameter set. Specifically, the preset parameter set may refer to Table 1 in the embodiment of FIG. 2 and related content, and details are not described herein again.

In the embodiment of the present invention, the first calculating unit 603 may be specifically configured to obtain a preferred receiving filter coefficient that maximizes the receiver signal to interference and noise ratio SINR _RX by using the following algorithm.

Where g _TX (t) is equal to

For specific implementations of the first computing unit 603, reference may be made to related content in the method embodiment of FIG. 2, and details are not described herein again.

As shown in FIG. 6, the communication network device 60 may further include: a second calculation unit 607 and a second approximation unit 609, wherein:

a second calculating unit 607, configured to perform, according to the channel statistical characteristic H,

a second approximation unit 609 for approximating the preferred transmit filter coefficients using a known window function

Obtaining the preferred transmit filter coefficients

Approximate transmit filter

Said

Used to configure the transmitter filter.

In the embodiment of the present invention, the second calculating unit 607 may be specifically configured to obtain a preferred transmit filter coefficient that maximizes the transmit signal to interference and noise ratio SINR _TX by using the following algorithm.

Where γ _RX (t) is equal to

For details, refer to related content in the method embodiment of FIG. 2 for specific implementation of the second computing unit 607, and details are not described herein again.

Further, the communication network device 60 may further include an iterative optimization unit. The iterative unit may be configured to: progressively optimize the transmit filter coefficients g _TX (t) and the receive filter coefficients γ _RX (t) through an iterative optimization process; wherein:

Where g _TX (t) is equal to

Is the preferred transmit filter coefficient obtained in the ith round

Approximate transmit filter coefficients,

Where γ _RX (t) is equal to

Is the preferred receive filter coefficient obtained in the ith round

Approximate receive filter coefficients,

Is a preferred receive filter coefficient calculated in the ith round to maximize the receiver signal to interference and noise ratio SINR _RX ;

Where i is a positive integer.

For details, refer to the related content in the method embodiment of FIG. 2 and FIG. 4 for specific implementation of the iterative unit, and details are not described herein again.

It can be understood that the specific implementation of the functional unit included in the communication network device 60 can refer to the content of the method embodiment of FIG. 2, and details are not described herein again.

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 7, the base station 70 may include: a determining unit 701, a receiving unit 703, a determining unit 705, and a notifying unit 707, where:

a determining unit 701, configured to: if the current communication scenario belongs to a preset communication scenario that requires pulse shaping processing, the base station determines a pulse to be configured for the current communication scenario; the pulse to be configured is characterized by a set of pulse parameters;

The receiving unit 703 is configured to receive configuration information sent by the terminal device, where the configuration information is used to indicate a pulse shape supported by the terminal device;

The determining unit 705 is configured to determine, according to the configuration information, whether the terminal device supports the pulse to be configured, and determine whether a pulse shaping process needs to be performed on the terminal device side;

The notification unit 707 is configured to notify the terminal device of the pulse parameter of the pulse to be configured if the configuration information indicates that the terminal device supports the pulse to be configured, and determines that a pulse shaping process needs to be performed on the terminal device side. The pulse parameter is used to configure a filter coefficient of the terminal device.

Specifically, the preset communication scenario that requires the pulse forming process may refer to the content in the method embodiment of FIG. 5, and details are not described herein again.

Specifically, the pulse parameter may be all or part of a preset parameter set. Specifically, the preset parameter set may refer to Table 1 in the embodiment of FIG. 2 and related content, and details are not described herein again.

Specifically, the determining unit 705 may be specifically configured to: determine, according to at least one of a service type of the transmission service, a preset requirement of the communication scenario, and an overhead of the protection band, whether to perform pulse modulation on the transmitting end.

Specifically, the determining unit 705 can be specifically configured to: according to the demodulation performance of the receiving end, the coding and modulation order of the signal At least one of the numbers determines whether a pulse modulation is required at the receiving end.

Further, the base station 70 may further include: a configuration unit, configured to configure, according to the pulse parameter of the to-be-configured pulse, a filter coefficient of the base station side if the pulse shaping process is required to be performed on the base station side; The filter coefficients of the base station are configured.

Specifically, the notification unit 707 may be specifically configured to: notify the terminal device by using the dynamic signaling with a fixed period, or notify the pulse parameter by using real-time dynamic signaling. Terminal Equipment.

In a specific implementation, the signaling may directly carry the pulse parameter of the to-be-configured pulse, and the signaling may also carry the indication information of the to-be-configured pulse.

It can be understood that the specific implementation of the functional unit included in the base station 70 can refer to the functions of the base station in the method embodiment of FIG. 5, and details are not described herein again.

Corresponding to the base station 70, a terminal device is further provided by the embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 8, the terminal device 80 may include: a transmitting unit 801, a receiving unit 803, and a configuration unit 805, where:

The sending unit 801 is configured to send, to the base station, configuration information, where the configuration information is used to indicate a pulse shape supported by the terminal device;

The receiving unit 803 is configured to receive a pulse parameter of the to-be-configured pulse notified by the base station;

The configuration unit 805 is configured to configure a filter coefficient according to the pulse parameter of the pulse to be configured.

In the embodiment of the present invention, the pulse shape supported by the terminal device may be used to indicate whether the terminal device supports the to-be-configured pulse corresponding to the current communication scenario; the current communication scenario belongs to a preset pulse shaping process. Communication scenario. For the communication scenario in which the preset pulse forming process is required, refer to the content in the method embodiment of FIG. 5, and details are not described herein again.

Specifically, the receiving unit 803 is specifically configured to: receive dynamic signaling with a fixed period sent by the base station, where the dynamic signaling with a fixed period is used to notify the pulse parameter of the to-be-configured pulse; or

It can be understood that the specific implementation of the functional unit included in the terminal device 80 can refer to the function of the terminal device in the method embodiment of FIG. 5, and details are not described herein again.

In order to facilitate the implementation of the above filter configuration method, a schematic diagram of a transmitter and a receiver is provided below. Specifically, in an uplink communication process, the transmitter may be integrated in a terminal device, and the receiver may be integrated in a base station; in a downlink communication process, the transmitter may be integrated in a base station, and the receiver Can be integrated in the terminal device.

FIG. 9 is a schematic structural diagram of a transmitter according to an embodiment of the present invention. The transmitter is configured to perform pulse shaping processing on the transmission signal at the transmitting end. As shown in FIG. 9, the transmitter 10 may include a pulse shaping controller 101, a pulse shaping filter 102, an inverse Fourier transform (IFT) 103, and a parallel/serial conversion (P/S) module 104, wherein:

The inverse Fourier transform module 103 can be configured to perform inverse Fourier transform on the serial-to-parallel converted baseband modulated signal, and output the transformed signal to the pulse shaping filter 102;

The pulse forming controller 101 is configured to: receive pulse configuration signaling, generate a pulse parameter corresponding to the pulse to be configured according to the pulse configuration signaling, and output the pulse parameter to the pulse shaping filter 102; the pulse shaping filter 102 is available And performing subcarrier level filtering on the output signal of the inverse Fourier transform module 103, performing pulse shaping processing on the output signal of the inverse Fourier transform module 103 according to the pulse parameter; and outputting the processed signal to P/S module 104;

The P/S module 104 is configured to serially output a signal processed by the pulse shaping filter.

A specific implementation manner of the transmitter 10 provided by the embodiment of the present invention is further described below with reference to FIG. 10 and FIG. Wherein: the transmitter 10 corresponding to FIG. 10 is preferably applied in a scene in which the length of the pulse shape is small (such as the K≤2), and the transmitter 10 corresponding to FIG. 11 is preferably applied when the length of the pulse shape is large (as in the In the scene of K>2).

In an implementation manner of the embodiment of the present invention, the transmitter 10 can be as shown in FIG. Wherein: the inverse Fourier transform module 103, the parallel-to-serial conversion (P/S) module 104 and the pulse shaping controller 101 are identical to the corresponding modules in the embodiment of FIG. 9, and are not described again; the pulse shaping filter 102 can be as shown in FIG. The method further includes an adding module 1021, a windowing module 1023, a computing module 1025, and a storage module 1027.

The adding module 1021, the windowing module 1023, and the calculating module 1025 may be used together for the inverse Fourier transform module 103 under the condition that the first flag Flag _head is equal to the first enable value (such as "1"). The head of the OFDM symbol of the output signal is subjected to pulse shaping processing. among them:

The adding module 1021 is configured to: add, for the OFDM symbol, a cyclic prefix of a first length; and output the OFDM symbol to which the cyclic prefix is added to the windowing module 1023.

For example, as shown in FIG. 10, the first length may be equal to (N _CP + N ₂ ). In an actual application, the first length may also be equal to N _CP plus an integer multiple of N ₂ , for example, (N _CP +2N ₂ ), and the first length may also be other values, which is not limited herein.

The windowing module 1023 can be configured to: for a header portion of the OFDM symbol, use a first window portion of a preset windowing function (such as a windowing function indicated by P _type ), at M sampling points of the header portion, Windowing the OFDM symbol; and outputting the windowed OFDM symbol to the computing module 1025; the M is a positive integer.

For example, as shown in FIG. 10, the M may be equal to (N ₁ + N ₂ ). It should be noted that, according to actual application requirements, the M may also be other values, such as (N ₁ + 2N ₂ ), which is not limited herein.

The calculating module 1025 is operative to: add X sampling points of the tail portion of the previous OFDM symbol to the OFDM symbol on the X sampling points of the header portion of the OFDM symbol after the windowing process; The added OFDM symbol output. The X is a positive integer. It should be noted that the addition refers to adding X sampling points of the tail portion of one OFDM symbol in the time domain. For example, as shown in FIG. 10, the X is equal to 2N ₂ , and its physical meaning is as shown in FIG. 3, which means that a sampling point overlapping the tail portion of the previous OFDM symbol and the OFDM symbol is added to the OFDM. The head part of the symbol.

The adding module 1021 and the windowing module 1023 may also be used together for the output signal of the inverse Fourier transform module 103 under the condition that the second flag bit _tail is equal to the second enable value (such as "1"). The tail of the OFDM symbol is subjected to pulse shaping processing. among them:

The adding module 1021 is configured to: add, for the OFDM symbol, a cyclic suffix of a second length; and output the OFDM symbol to which the cyclic suffix is added to the windowing module 1023.

For example, as shown in FIG. 10, the second length may be equal to N _2. In a practical application, the second length may also be equal to N _CP plus an integer multiple of N ₂ , for example, (N _CP +2N ₂ ), and the second length may also be other values, which is not limited herein.

The windowing module 1023 can be configured to: for the tail portion of the OFDM symbol output by the adding module 1021, using the second half of the preset windowing function (such as the windowing function indicated by P _type ), N in the tail portion At the sampling point, the OFDM symbol is windowed; and the windowed OFDM symbol is output; the N is a positive integer.

For example, as shown in FIG. 10, the N may be equal to (N ₁ + N ₂ ). It should be noted that, according to actual application requirements, the N may also be other values, such as (N ₁ + 2N ₂ ), which is not limited herein.

In addition, the storage module 1029 in the transmitter 10 shown in FIG. 10 can be configured to save the Y sample points of the tail portion of the OFDM symbol after the windowing process into a storage medium. In a specific implementation, Y may be equal to X, that is, X sampling points of the tail portion of the previous OFDM symbol may be stored in a storage medium. In practical applications, Y can also be greater than X, which is not limited here.

In 5G and future communication scenarios, Time Division Duplexing (TDD) technology requires more frequent uplink and downlink switching, usually with a switching period of less than 1 millisecond. When the uplink and downlink are switched, the signal may be leaked in the time domain due to the system's out-of-synchronization, causing mutual interference between the uplink and the downlink. By performing pulse shaping processing on the tail of the last symbol of the uplink frame described in the embodiment of the present invention, or performing pulse shaping processing on the head of the first symbol of the downlink frame, smooth switching of uplink and downlink data frames can be realized. Help improve the uplink and downlink interference.

In another implementation of the embodiment of the present invention, the transmitter 10 can be as shown in FIG. Wherein: the inverse Fourier transform module 103, the parallel-to-serial conversion (P/S) module 104 and the pulse shaping controller 101 are identical to the corresponding modules in the embodiment of FIG. 9, and are not described again; the pulse shaping filter 102 can be as shown in FIG. The method includes: a multi-phase register network, configured to perform a sub-carrier level on an output signal of the inverse Fourier transform module 103 according to the length K and a transmit-end filter coefficient determined by the shape P _{type of the} pulse to be configured. Filtering, and outputting the filtered plurality of subcarriers to the parallel to serial conversion module 104.

Specifically, as shown in FIG. 10, the depth of the multi-phase register network is consistent with the length K. A set of said lengths K and P _type can determine the transmit end filter coefficient g _tx . The input received by the multi-phase register network shown in FIG. 10 is the n-channel signal of the output of the inverse Fourier transform module 103.

In still another implementation of the embodiment of the present invention, the transmitter 10 may include: a pulse shaping filter in the embodiment of FIG. 10 and a pulse shaping filter in the embodiment of FIG. 11, both of which are pulse-formed The controller 101 and the inverse Fourier transform module 103 are connected.

In a possible implementation manner, the pulse shaping filter in the corresponding embodiment of FIG. 10 and FIG. 11 respectively may be two hardware modules, and the two hardware modules are independently integrated in the transmitter 10, and each of them is The pulse forming controllers are connected; in practical applications, the two hardware modules can also be integrated in the pulse forming controller as part of the pulse forming controller, and the hardware modules of the two hardware modules are in the embodiment of the present invention. There is no restriction on the layout.

In another possible implementation manner, the pulse shaping filter in the corresponding embodiment of FIG. 10 and FIG. 11 respectively may be two software modules, and the two software modules may be operated in the pulse forming controller. It can be run on other processing chips that can communicate with the pulse shaping controller. The embodiment of the present invention does not limit the operating environment of the two software modules.

In still another implementation, the pulse forming controller 101 is further configured to: determine whether the length K is greater than a preset value (eg, 2), and if greater, output the pulse parameter to the embodiment of FIG. a pulse shaping filter for triggering the pulse shaping filter in the embodiment of FIG. 10 to perform pulse shaping processing on the transmission signal; if less than or equal to, outputting the pulse parameter to the pulse shaping filter in the embodiment of FIG. For triggering the pulse shaping filter in the embodiment of FIG. 10 to perform pulse shaping processing on the transmission signal.

It can be understood that the pulse parameter used in the embodiment of FIG. 10 may be a subset of the preset parameter set shown in FIG. 1, ie, {N ₁ , N ₂ , Flag _head , Flag _tail }; used in the embodiment of FIG. 10 The pulse parameter can be another subset of the preset parameter set shown in Figure 1, namely {K, P _type }.

In the embodiment of the present invention, the pulse configuration signaling received by the pulse forming controller 101 may be an upper layer, for example, a signaling sent by a Radio Resource Control (RRC). In practical applications, the pulse configuration signaling may also be sent by the application layer to the pulse shaping controller 101 in response to user operations. The embodiment of the present invention is not limited in terms of the source and the manner of generating the pulse configuration signaling.

FIG. 12 is a schematic structural diagram of a receiver according to an embodiment of the present invention. As shown in FIG. 12, the receiver 20 may include a serial to parallel conversion (S/P) module 204, a pulse shaping filter 202, a pulse shaping controller 201, and a Fourier transform module 203, wherein:

The S/P module 204 can be configured to: output the serial input transmission signal to the pulse shaping filter 202 in parallel;

The pulse shaping controller 201 is configured to: receive pulse configuration signaling, generate a pulse parameter corresponding to the pulse to be configured according to the pulse configuration signaling, and output the pulse parameter to the pulse shaping filter 202;

The pulse shaping filter 202 can be configured to perform subcarrier level filtering on the output signal of the S/P module 204, perform pulse shaping processing on the output signal of the S/P module 204 according to the pulse parameter, and output the processed signal to Fourier transform module 203;

The Fourier transform module 203 can be configured to perform a Fourier transform on the signal processed by the pulse shaping filter.

It should be noted that FIG. 12 only shows a part of the architecture of the receiver 20. In practical applications, the receiver 20 may further include other modules for signal demodulation and signal reception, which are not described herein.

In the embodiment of the present invention, the pulse parameter that the pulse shaping controller 201 outputs to the pulse shaping filter 202 may be all or part of the preset parameter set. Specifically, the preset parameter set may refer to Table 1 in the embodiment of FIG. 2 and related description, and details are not described herein again.

A specific implementation manner of the receiver 20 provided by the embodiment of the present invention is described in detail below with reference to FIG. 13 and FIG. Wherein: the receiver 20 corresponding to FIG. 13 is preferably applied in a scene in which the length of the pulse shape is small (such as the K≤2), and the receiver 20 corresponding to FIG. 14 is preferably applied when the length of the pulse shape is large (as in the In the scene of K>2).

In an implementation manner of the embodiment of the present invention, the receiver 20 can be as shown in FIG. The serial-to-parallel conversion (S/P) module 204, the pulse-forming controller 201, and the Fourier transform module 203 are identical to the corresponding modules in the embodiment of FIG. 12, and are not described again; the pulse-forming filter 202 can be as shown in FIG. The display further includes: a calculation module 2021, a windowing module 2023, a removal module 2025, and a storage module 2027.

The calculation module 2021, the windowing module 2023, and the removal module 2025 may be used together for output signals to the S/P module 204 under the condition that the first flag Flag _head is equal to the first enable value (eg, "1"). The head of the corresponding OFDM symbol is subjected to pulse shaping processing. among them:

The calculating module 2021 is configured to: with respect to the header portion of the OFDM symbol, use X sampling points of the tail portion of the previous OFDM symbol to subtract the OFDM symbol from the X sampling points of the header portion; The subtracted OFDM symbols are output to the windowing module 2023. Wherein X is a positive integer. It should be noted that the subtraction refers to subtracting X sample points of the tail portion of the previous OFDM symbol in the time domain. For example, as shown in FIG. 13, the Y may be equal to 2N ₂ , and its physical meaning is as described with reference to FIG. 3, which means subtracting the tail portion and the slave of the previous OFDM symbol from the header portion of the OFDM symbol. Sample points where OFDM symbols overlap.

The windowing module 2023 is configured to: for the header portion of the subtracted OFDM symbol, perform the OFDM symbol on the M sampling points of the header portion by using a first half of the preset windowing function Windowing processing; and outputting the windowed OFDM symbol to the removing module 2025; the M is a positive integer.

For example, as shown in FIG. 13, the M may be equal to (N ₁ + N ₂ ). It should be noted that, according to actual application requirements, the M may also be other values, such as (N ₁ + 2N ₂ ), which is not limited herein.

The removing module 2025 is configured to: remove, for the OFDM symbol after the windowing process, a cyclic prefix of a first length; and output the OFDM symbol after removing the cyclic prefix.

For example, as shown in FIG. 13, the first length may be equal to (N _CP + N ₂ ). In an actual application, the first length may also be equal to N _CP plus an integer multiple of N ₂ , for example, (N _CP +2N ₂ ), and the first length may also be other values, which is not limited herein.

The windowing module 2023 and the removing module 2025 may be used together for the OFDM symbol corresponding to the output signal of the S/P module 204 under the condition that the second flag bit _tail is equal to the second enabling value (such as "1"). The tail is pulsed. among them:

The windowing module 2023 is configured to: for the tail portion of the OFDM symbol, use a second half of the preset windowing function to perform windowing on the OFDM symbol at the N sampling points of the tail portion; Outputting the windowed OFDM symbol to the removal module; the N is a positive integer.

For example, as shown in FIG. 13, the N may be equal to (N ₁ + N ₂ ). It should be noted that, according to actual application requirements, the N may also be other values, such as (N ₁ + 2N ₂ ), which is not limited herein.

The removing module 2025 is configured to: remove the cyclic suffix of the second length for the windowed processed OFDM symbol; and output the OFDM symbol with the cyclic suffix removed.

For example, as shown in FIG. 13, the second length may be equal to N _2. In a practical application, the second length may also be equal to N _CP plus an integer multiple of N ₂ , for example, (N _CP +2N ₂ ), and the second length may also be other values, which is not limited herein.

In addition, the storage module 2027 in the receiver 20 shown in FIG. 13 can be configured to: save Y sample points of the tail portion of the OFDM symbol corresponding to the output signal of the S/P module 204 into a storage medium; the Y is a positive integer . In a specific implementation, Y may be equal to X, that is, X sampling points of the tail portion of the previous OFDM symbol may be stored in a storage medium. In practical applications, Y can also be greater than X, which is not limited here.

In another implementation of the embodiment of the present invention, the receiver 20 can be as shown in FIG. Wherein: the serial-to-parallel conversion (S/P) module 204, the pulse forming controller 201, and the Fourier transform module 203 are identical to the corresponding modules in the embodiment of FIG. 5, and are not described again; the pulse shaping filter 202 can be as shown in FIG. The method includes: a multi-phase register network, configured to: perform sub-carrier level filtering on an output signal of the S/P module 204 according to the length K and the receiving end filter coefficient determined by the shape P _{type of the} pulse to be configured, and The filtered plurality of subcarriers are output to the Fourier transform module 203.

Specifically, as shown in FIG. 14, the depth of the multi-phase register network is consistent with the length K. A set of said lengths K and P _type can determine the transmit end filter coefficient γ _rx . The input received by the multi-phase register network shown in FIG. 14 is the n-channel signal output by the S/P module 204.

In still another implementation of the embodiment of the present invention, the receiver 20 may include: a pulse shaping filter in the embodiment of FIG. 13 and a pulse shaping filter in the embodiment of FIG. 14, both of which are pulse-formed The controller 201 and the inverse Fourier transform module 203 are connected.

In a possible implementation manner, the pulse shaping filter in the corresponding embodiment of FIG. 13 and FIG. 14 respectively may be two hardware modules, and the two hardware modules are independently integrated in the transmitter 10, and each of them is The pulse forming controllers are connected; in practical applications, the two hardware modules can also be integrated in the pulse forming controller as part of the pulse forming controller, and the hardware modules of the two hardware modules are in the embodiment of the present invention. There is no restriction on the layout.

In another possible implementation manner, the pulse shaping filter in the corresponding embodiment of FIG. 13 and FIG. 14 respectively may be two software modules, and the two software modules may be operated in the pulse forming controller. It can be run on other processing chips that can communicate with the pulse shaping controller. The embodiment of the present invention does not limit the operating environment of the two software modules.

In still another implementation, the pulse forming controller 101 is further configured to: determine whether the length K is greater than a preset value (eg, 2), and if greater, output the pulse parameter to the embodiment of FIG. 14 a pulse shaping filter for triggering the pulse shaping filter in the embodiment of FIG. 14 to perform pulse shaping processing on the transmission signal; if less than or equal to, outputting the pulse parameter to the pulse shaping filter in the embodiment of FIG. The pulse shaping filter transmission signal in the embodiment of FIG. 13 is triggered to perform pulse shaping processing.

It can be understood that the pulse parameter used in the embodiment of FIG. 13 may be a subset of the preset parameter set shown in FIG. 1, namely {N ₁ , N ₂ , Flag _head , Flag _tail }; used in the embodiment of FIG. 14 The pulse parameter can be another subset of the preset parameter set shown in Table 1, namely {K, P _type }.

For the source and the manner of the pulse configuration signaling received by the pulse forming controller 201, reference may be made to the related description in the embodiment of the transmitter 10, which is not limited in the embodiment of the present invention.

In addition, an embodiment of the present invention further provides a communication system, where the communication system includes: a base station and a terminal device, where:

The base station may be the base station 70 described in the embodiment corresponding to FIG. 7, or may be the base station described in the method embodiment of FIG. 5. For the function and implementation manner of the base station, reference may be made specifically to the content of the method embodiment of FIG. No longer;

The terminal device may be the terminal device 80 described in the embodiment corresponding to FIG. 8, or may be the terminal device station described in the method embodiment of FIG. 5. The function and implementation manner of the terminal device may be specifically implemented by referring to the method in FIG. The content of the example will not be described here.

In summary, by implementing the filter optimization method provided by the embodiments of the present invention, a preferred receive filter coefficient or a preferred transmit filter coefficient is obtained by maximizing the receive signal to interference and noise ratio, and using a known window function. Approximating the preferred receive filter coefficients or the preferred transmit filter coefficients, the dry noise ratio can be improved, and the demodulation performance can be improved. By implementing the filter configuration method provided by the embodiments of the present invention, pulse shaping is required at a preset time. In the processed communication scenario, the filter of the transmitting end and/or the receiving end is configured by the pulse parameter of the pulse to be configured, thereby improving the communication performance of the entire communication system, such as reducing out-of-band power leakage, improving signal to interference and noise ratio, reducing interference, etc. Wait.

One of ordinary skill in the art can understand that all or part of the process of implementing the foregoing embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above disclosure is only a part of the embodiments of the present invention, and the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the claims of the present invention. Equivalent changes are still within the scope of the invention.

Claims

A filter optimization method, comprising:

Determining a transmit filter coefficient that satisfies the target adjacent channel leakage ratio requirement according to a target adjacent channel leakage ratio requirement

According to the channel statistical characteristic H and the requirement of the target adjacent channel leakage ratio
Calculate the preferred receive filter coefficients that maximize the receiver signal to interference and noise ratio SINR RX
Wherein, the channel statistical characteristic, the transmission filter coefficient g TX (t), and the reception filter coefficient γ RX (t) are variables that determine the signal-to-interference-and-noise ratio SINR RX of the receiving end;

Approximating the preferred receive filter coefficients using a known window function
Obtaining the preferred receive filter coefficients
Approximate receive filter coefficient
Said
Used to configure the receiver filter.
The method of claim 1 wherein said statistical characteristic H according to a channel and said target adjacent channel leakage ratio are met
Calculate the preferred receive filter coefficients that maximize the receiver signal to interference and noise ratio SINR RX
include:

The preferred receiving filter coefficients that maximize the receiver signal to interference and noise ratio SINR RX are obtained by the following algorithm.

Where g TX (t) is equal to
The method of claim 1 or 2, further comprising:

According to the channel statistical property H and the
Calculating a preferred transmit filter coefficient that maximizes the transmit signal to interference and noise ratio SINR TX
The channel statistical characteristic, the transmit filter coefficient g TX (t), and the receive filter coefficient γ RX (t) are variables that determine the transmit signal to interference and noise ratio SINR TX ;

Approximating the preferred transmit filter coefficients using known window functions
Obtaining the preferred transmit filter coefficients
Approximate transmit filter
Said
Used to configure the transmitter filter.
The method of claim 3, wherein said said according to said channel statistical characteristic H and said
Calculating a preferred transmit filter coefficient that maximizes the transmit signal to interference and noise ratio SINR TX
include:

The preferred transmit filter coefficients that maximize the transmit signal to interference and noise ratio SINR TX are obtained by the following algorithm.

Where γ RX (t) is equal to
The method according to any one of claims 1 to 4, wherein said obtaining and said preferred receiving filter coefficients are obtained
Approximate receive filter coefficient
After that, it also includes:

The transmit filter coefficients g TX (t) and the receive filter coefficients γ RX (t) are progressively optimized by an iterative optimization process;

In the (i+1)th round, the preferred receive filter coefficients are calculated by the following algorithm.

Where g TX (t) is equal to
Is the preferred transmit filter coefficient obtained in the ith round
Approximate transmit filter coefficients,
Is a preferred transmit filter coefficient calculated in the ith round to maximize the transmit signal to interference and noise ratio SINR TX ;

Or, in the (i+1)th round, the preferred transmit filter coefficients are calculated by the following algorithm.

Where γ RX (t) is equal to
Is the preferred receive filter coefficient obtained in the ith round
Approximate receive filter coefficients,
Is a preferred receive filter coefficient calculated in the ith round to maximize the receiver signal to interference and noise ratio SINR RX ;

Where i is a positive integer.
A method according to any one of claims 1 to 5, wherein said reception filter coefficients g TX (t) and said transmission filter coefficients γ RX (t) are each characterized by a predefined pulse parameter;

The pulse parameter includes: all or part of a preset parameter set; the preset parameter set includes: a first flag position Flag head , a second flag bit Flag tail , a first value N 1 , a second value N 2 , a pulse The shape P type and the length K of the pulse to be configured with respect to a single symbol period. The first flag Flag head is used to indicate whether the symbol header is pulse-formed, the second flag Flag tail is used to indicate whether the symbol tail is pulse-formed, and the first value N 1 is used to indicate a single The number of sampling points in the symbol which are pulse-formed and whose amplitude weight is not equal to 1, and the second value N 2 is used to indicate the number of sampling points for pulse shaping outside a single symbol; the pulse shape P type is used to indicate The shape of the pulse to be configured.
A filter configuration method, which is applied to a base station side, and includes:

If the current communication scenario belongs to a preset communication scenario that requires pulse shaping processing, the base station determines a pulse to be configured for the current communication scenario; the pulse to be configured is characterized by a set of pulse parameters;

Receiving configuration information sent by the terminal device, where the configuration information is used to indicate a pulse shape supported by the terminal device;

And if the configuration information indicates that the terminal device supports the pulse to be configured, and determines that a pulse shaping process needs to be performed on the terminal device side, notifying the pulse parameter of the pulse to be configured to the terminal device; And configuring a filter coefficient of the terminal device.
The method of claim 7, wherein the step of performing a pulse forming process on the terminal device side comprises:

In the uplink transmission process, pulse modulation needs to be performed at the transmitting end; or, in the downlink transmission process, pulse modulation needs to be performed at the receiving end;

The pulse parameter is used to configure a filter coefficient of the terminal device, including:

In the uplink transmission process, the pulse parameter of the pulse to be configured is used to configure the transmission filter of the terminal device; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used to configure the reception filter of the terminal device.
The method according to claim 7 or 8, further comprising: if it is determined that the pulse forming process needs to be performed on the base station side, configuring the filter coefficients of the base station side according to the pulse parameter of the pulse to be configured The pulse parameter is used to configure a filter coefficient of the base station.
The method of claim 9 wherein said step of performing a pulse shaping process on the base station side comprises:

In the uplink transmission process, pulse modulation needs to be performed at the receiving end; or, in the downlink transmission process, pulse modulation needs to be performed at the transmitting end;

The pulse parameter is used to configure a filter coefficient of the base station, including:

In the uplink transmission process, the pulse parameter of the pulse to be configured is used to configure the receiving filter coefficient of the base station; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used to configure the transmission filter coefficient of the base station.
The method according to claim 8 or 10, wherein said determining that pulse modulation is required at the transmitting end comprises:

Whether it is necessary to perform pulse modulation at the transmitting end according to at least one of a service type of the transmission service, a preset requirement of the communication scenario, and an overhead of the guard band.
The method according to claim 8 or 10, wherein said determining that pulse modulation is required at the receiving end comprises:

Whether or not pulse modulation is required at the receiving end is determined according to at least one of the demodulation performance of the receiving end, the encoding of the signal, and the order of modulation.
The method according to any one of claims 7 to 12, wherein the notifying the pulse parameter of the pulse to be configured to the terminal device comprises:

Notifying the terminal device to the terminal device by using dynamic signaling with a fixed period; or

The pulse parameters are notified to the terminal device by real-time dynamic signaling.
The method according to claim 13, wherein the signaling carries a pulse parameter of the pulse to be configured; or the signaling carries indication information of the pulse to be configured.
The method according to any one of claims 7-14, wherein the preset communication scenario requiring pulse shaping processing comprises at least one of the following:

The current communication scenario belongs to a preset scenario that needs to limit out-of-band power leakage, the terminal device is scheduled to be at a resource edge where different OFDM setting parameters coexist, and the terminal device adopts a high-order modulation or a high-order modulation and coding strategy. The current time-frequency fading of the terminal device reaches a preset level, and the resource location corresponding to the terminal device is at the frame header and/or the end of the data frame, and the physical channel currently in which the terminal device is located is a preset requirement. Pulse shaped physical channel; the OFDM setup parameters include a cyclic prefix length and a subcarrier width.
The method according to any one of claims 7 to 15, wherein the pulse parameter comprises: all or part of a preset parameter set; the preset parameter set comprises: a first flag position Flag head , A flag tail , a first value N 1 , a second value N 2 , a pulse shape P type, and a length K of the pulse to be configured with respect to a single symbol period. The first flag Flag head is used to indicate whether the symbol header is pulse-formed, the second flag Flag tail is used to indicate whether the symbol tail is pulse-formed, and the first value N 1 is used to indicate a single The number of sampling points in the symbol which are pulse-formed and whose amplitude weight is not equal to 1, and the second value N 2 is used to indicate the number of sampling points for pulse shaping outside the single symbol, and the pulse shape P type is used to indicate The shape of the pulse to be configured.
A filter configuration method, which is applied to a terminal device side, and includes:

Sending, to the base station, configuration information, where the configuration information is used to indicate a pulse shape supported by the terminal device; and receiving, by the base station, a pulse parameter of the to-be-configured pulse;

The filter coefficients are configured according to the pulse parameters of the pulse to be configured.
The method of claim 17, wherein the receiving the pulse parameters of the to-be-configured pulse notified by the base station comprises:

Receiving dynamic signaling with a fixed period sent by the base station, where the dynamic signaling with a fixed period is used to notify the pulse parameter of the to-be-configured pulse; or

Receiving real-time dynamic signaling sent by the base station, where the real-time dynamic signaling is used to notify the pulse parameters of the to-be-configured pulse.
The method according to claim 18, wherein the signaling carries a pulse parameter of the pulse to be configured; or the signaling carries indication information of the pulse to be configured.
The method according to any one of claims 17 to 19, wherein the pulse shape supported by the terminal device is used to indicate whether the terminal device supports the to-be-configured pulse corresponding to a current communication scenario; The current communication scenario belongs to a preset communication scenario that requires pulse shaping processing.
The method according to any one of claims 17 to 20, wherein the predetermined communication scenario requiring pulse shaping processing comprises at least one of the following:

The current communication scenario belongs to a preset scenario that needs to limit out-of-band power leakage, the terminal device is scheduled to be at a resource edge where different OFDM setting parameters coexist, and the terminal device adopts a high-order modulation or a high-order modulation and coding strategy. The current time-frequency fading of the terminal device reaches a preset level, and the resource location corresponding to the terminal device is at the frame header and/or the end of the data frame, and the physical channel currently in which the terminal device is located is a preset requirement. Pulse shaped physical channel; the OFDM setup parameters include a cyclic prefix length and a subcarrier width.
A communication network device, comprising:

a determining unit, configured to determine a transmit filter coefficient that meets the target adjacent channel leakage ratio requirement according to a target adjacent channel leakage ratio requirement

a first calculating unit, configured to: according to a channel statistical characteristic H and satisfying the target adjacent channel leakage ratio requirement
Calculate the preferred receive filter coefficients that maximize the receiver signal to interference and noise ratio SINR RX
Wherein, the channel statistical characteristic, the transmission filter coefficient g TX (t), and the reception filter coefficient γ RX (t) are variables that determine the signal-to-interference-and-noise ratio SINR RX of the receiving end;

a first approximation unit for approximating the preferred receive filter coefficients using a known window function
Obtaining the preferred receive filter coefficients
Approximate receive filter coefficient
Said
Used to configure the receiver filter.
The device according to claim 22, wherein the first calculating unit is specifically configured to:

The preferred receiving filter coefficients that maximize the receiver signal to interference and noise ratio SINR RX are obtained by the following algorithm.

Where g TX (t) is equal to
The device according to claim 22 or 23, further comprising:

a second calculating unit, configured to calculate the characteristic H according to the channel and the
Calculating a preferred transmit filter coefficient that maximizes the transmit signal to interference and noise ratio SINR TX
The channel statistics characteristic, the transmit filter coefficient g TX (t), and the receive filter coefficient γ RX (t) are variables that determine the transmit signal to interference and noise ratio SINR TX ;

a second approximation unit for approximating the preferred transmit filter coefficients using a known window function
Obtaining the preferred transmit filter coefficients
Approximate transmit filter
Said
Used to configure the transmitter filter.
The device according to claim 24, wherein the second calculating unit is specifically configured to:

The preferred transmit filter coefficients that maximize the transmit signal to interference and noise ratio SINR TX are obtained by the following algorithm.

Where γ RX (t) is equal to
The apparatus according to any one of claims 22 to 25, further comprising: an iterative optimization unit, configured to: progressively optimize the transmit filter coefficient g TX (t) by an iterative optimization process And the receive filter coefficient γ RX (t); where:

In the (i+1)th round, the preferred receive filter coefficients are calculated by the following algorithm.

Where g TX (t) is equal to
Is the preferred transmit filter coefficient obtained in the ith round
Approximate transmit filter coefficients,
Is a preferred transmit filter coefficient calculated in the ith round to maximize the transmit signal to interference and noise ratio SINR TX ;

Or, in the (i+1)th round, the preferred transmit filter coefficients are calculated by the following algorithm.

Where γ RX (t) is equal to
Is the preferred receive filter coefficient obtained in the ith round
Approximate receive filter coefficients,
Is a preferred receive filter coefficient calculated in the ith round to maximize the receiver signal to interference and noise ratio SINR RX ;

Where i is a positive integer.
Apparatus according to any of claims 22-26, wherein said receive filter coefficients g TX (t) and said transmit filter coefficients γ RX (t) are characterized by predefined pulse parameters ;

The pulse parameter includes: all or part of a preset parameter set; the preset parameter set includes: a first flag position Flag head , a second flag bit Flag tail , a first value N 1 , a second value N 2 , a pulse The shape P type and the length K of the pulse to be configured with respect to a single symbol period. The first flag Flag head is used to indicate whether the symbol header is pulse-formed, the second flag Flag tail is used to indicate whether the symbol tail is pulse-formed, and the first value N 1 is used to indicate a single The number of sampling points in the symbol which are pulse-formed and whose amplitude weight is not equal to 1, and the second value N 2 is used to indicate the number of sampling points for pulse shaping outside a single symbol; the pulse shape P type is used to indicate The shape of the pulse to be configured.
A base station, comprising:

a determining unit, configured to: if the current communication scenario belongs to a preset communication scenario that requires pulse shaping processing, the base station determines a pulse to be configured for the current communication scenario; the pulse to be configured is characterized by a set of pulse parameters;

a receiving unit, configured to receive configuration information sent by the terminal device, where the configuration information is used to indicate a pulse shape supported by the terminal device;

a determining unit, configured to determine, according to the configuration information, whether the terminal device supports the pulse to be configured, and determine whether a pulse shaping process needs to be performed on the terminal device side;

a notification unit, configured to notify the terminal device of the pulse parameter of the pulse to be configured if the configuration information indicates that the terminal device supports the pulse to be configured, and determines that a pulse shaping process needs to be performed on the terminal device side; The pulse parameter is used to configure a filter coefficient of the terminal device.
The base station according to claim 28, wherein said performing pulse forming processing on the terminal device side comprises:

In the uplink transmission process, pulse modulation needs to be performed at the transmitting end; or, in the downlink transmission process, pulse modulation needs to be performed at the receiving end;

The pulse parameter is used to configure a filter coefficient of the terminal device, including:

In the uplink transmission process, the pulse parameter of the pulse to be configured is used to configure the transmission filter of the terminal device; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used to configure the reception filter of the terminal device.
The base station according to claim 28 or 29, further comprising: a configuration unit, configured to configure the base station according to a pulse parameter of the pulse to be configured if it is determined that a pulse shaping process needs to be performed on the base station side Filter coefficients of the side; the pulse parameters are used to configure filter coefficients of the base station.
The base station according to claim 30, wherein said performing pulse shaping processing on the base station side comprises:

In the uplink transmission process, pulse modulation needs to be performed at the receiving end; or, in the downlink transmission process, pulse modulation needs to be performed at the transmitting end;

The pulse parameter is used to configure a filter coefficient of the base station, including:

In the uplink transmission process, the pulse parameter of the pulse to be configured is used to configure the receiving filter coefficient of the base station; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used to configure the transmission filter coefficient of the base station.
The base station according to claim 29 or 31, wherein the determining module is specifically configured to: determine whether it is needed according to at least one of a service type of a transmission service, a preset requirement of a communication scenario, and an overhead of a protection band. Pulse modulation is performed at the transmitting end.
The base station according to claim 29 or 31, wherein the determining module is specifically configured to: determine whether it needs to be at the receiving end according to at least one of a demodulation performance of the receiving end, a coding of the signal, and an order of modulation Perform pulse modulation.
The base station according to any one of claims 28 to 33, wherein the notification unit is specifically configured to:

Notifying the terminal device to the terminal device by using dynamic signaling with a fixed period; or

The pulse parameters are notified to the terminal device by real-time dynamic signaling.
The base station according to claim 34, wherein the signaling carries a pulse parameter of the pulse to be configured; or the signaling carries indication information of the pulse to be configured.
The base station according to any one of claims 28 to 35, wherein the preset communication scenario requiring pulse shaping processing comprises at least one of the following:

The current communication scenario belongs to a preset scenario that needs to limit out-of-band power leakage, the terminal device is scheduled to be at a resource edge where different OFDM setting parameters coexist, and the terminal device adopts a high-order modulation or a high-order modulation and coding strategy. The current time-frequency fading of the terminal device reaches a preset level, and the resource location corresponding to the terminal device is at the frame header and/or the end of the data frame, and the physical channel currently in which the terminal device is located is a preset requirement. Pulse shaped physical channel; the OFDM setup parameters include a cyclic prefix length and a subcarrier width.
The base station according to any one of claims 28 to 36, wherein the pulse parameter comprises: all or part of a preset parameter set; the preset parameter set comprises: a first flag bit Flag head , A flag tail , a first value N 1 , a second value N 2 , a pulse shape P type, and a length K of the pulse to be configured with respect to a single symbol period. The first flag Flag head is used to indicate whether the symbol header is pulse-formed, the second flag Flag tail is used to indicate whether the symbol tail is pulse-formed, and the first value N 1 is used to indicate a single The number of sampling points in the symbol which are pulse-formed and whose amplitude weight is not equal to 1, and the second value N 2 is used to indicate the number of sampling points for pulse shaping outside the single symbol, and the pulse shape P type is used to indicate The shape of the pulse to be configured.
A terminal device, comprising:

a sending unit, configured to send configuration information to the base station, where the configuration information is used to indicate a pulse shape supported by the terminal device;

a receiving unit, configured to receive a pulse parameter of the to-be-configured pulse notified by the base station;

And a configuration unit, configured to configure a filter coefficient according to the pulse parameter of the pulse to be configured.
The terminal device according to claim 38, wherein the receiving unit is specifically configured to:

Receiving dynamic signaling with a fixed period sent by the base station, where the dynamic signaling with a fixed period is used to notify the pulse parameter of the to-be-configured pulse; or

Receiving real-time dynamic signaling sent by the base station, where the real-time dynamic signaling is used to notify the pulse parameters of the to-be-configured pulse.
The terminal device according to claim 39, wherein the signaling carries a pulse parameter of the pulse to be configured; or the signaling carries indication information of the pulse to be configured.
The terminal device according to any one of claims 38 to 40, wherein the pulse shape supported by the terminal device is used to indicate whether the terminal device supports the to-be-configured pulse corresponding to the current communication scenario; The current communication scenario belongs to a preset communication scenario that requires pulse shaping processing.
The terminal device according to any one of claims 38 to 41, wherein the preset communication scenario requiring pulse shaping processing comprises at least one of the following:

The current communication scenario belongs to a preset scenario that needs to limit out-of-band power leakage, the terminal device is scheduled to be at a resource edge where different OFDM setting parameters coexist, and the terminal device adopts a high-order modulation or a high-order modulation and coding strategy. The current time-frequency fading of the terminal device reaches a preset level, and the resource location corresponding to the terminal device is at the frame header and/or the end of the data frame, and the physical channel currently in which the terminal device is located is a preset requirement. Pulse shaped physical channel; the OFDM setup parameters include a cyclic prefix length and a subcarrier width.
A communication system, comprising: a base station and a terminal device, wherein:

The base station is the base station according to any one of claims 28-37;

The terminal device is the terminal device according to any one of claims 38-42.