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WO2017167269A1 - Procédé d'optimisation de filtre, procédé de configuration de filtre, et dispositif et système associés - Google Patents

Procédé d'optimisation de filtre, procédé de configuration de filtre, et dispositif et système associés Download PDF

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Publication number
WO2017167269A1
WO2017167269A1 PCT/CN2017/078992 CN2017078992W WO2017167269A1 WO 2017167269 A1 WO2017167269 A1 WO 2017167269A1 CN 2017078992 W CN2017078992 W CN 2017078992W WO 2017167269 A1 WO2017167269 A1 WO 2017167269A1
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WIPO (PCT)
Prior art keywords
pulse
terminal device
base station
filter coefficient
parameter
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PCT/CN2017/078992
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English (en)
Chinese (zh)
Inventor
赵兆
王奇
龙毅
郭志恒
程型清
龚希陶
舒尔曼·麦塔
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华为技术有限公司
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Publication of WO2017167269A1 publication Critical patent/WO2017167269A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation

Definitions

  • 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.
  • Orthogonal Frequency Division Multiplexing (OFDM) system is the most widely used communication system in recent years, for example, a Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • 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).
  • M2M Machine-To-Machine
  • MCC Man-Compute-Communication
  • Increased services such as Ultra-reliable and Low Latency Communications (uMTC) and Massive Machine Type Communications (MMTC).
  • uMTC Ultra-reliable and Low Latency Communications
  • MMTC Massive Machine Type Communications
  • 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
  • CP-OFDM Cyclic Prefix
  • OFDM Orthogonal Frequency Division Multiplexing
  • 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.
  • 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.
  • an embodiment of the present invention provides a filter optimization method, where the method includes:
  • 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
  • the channel statistical characteristic, the transmission filter coefficient g TX (t), and the reception filter coefficient ⁇ RX (t) are variables that determine the signal-to-interference-and-noise ratio SINR RX of the receiving end;
  • the determining, 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 include:
  • the preferred receiving filter coefficients that maximize the receiver signal to interference and noise ratio SINR RX are obtained by the following algorithm.
  • the method further includes:
  • the transmit filter coefficient g TX (t), and the receive filter coefficient ⁇ RX (t) are variables that determine the transmit signal to interference and noise ratio SINR TX ;
  • 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.
  • 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 ⁇ RX (t) are progressively optimized by an iterative optimization process; wherein:
  • the preferred receive filter coefficients are calculated by the following algorithm.
  • 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 ;
  • the preferred transmit filter coefficients are calculated by the following algorithm.
  • ⁇ 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.
  • the receiving filter coefficient g TX (t) and the transmitting filter coefficient ⁇ 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
  • 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
  • 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.
  • an embodiment of the present invention provides a filter configuration method, where the method is applied to a base station side, including:
  • 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 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 performing the pulse forming process on the terminal device side includes:
  • 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:
  • 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 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.
  • the performing the pulse forming process on the base station side includes:
  • 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:
  • 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 determining is required to perform a pulse at the transmitting end Modulation, including:
  • 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.
  • the notifying the pulse parameter of the pulse to be configured to the terminal Equipment including:
  • the pulse parameters are notified to the terminal device by real-time dynamic signaling.
  • 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.
  • 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.
  • the OFDM setup parameters include a cyclic prefix length and a subcarrier width.
  • 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
  • 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
  • the second value N 2 is used to indicate the number of sampling points for pulse shaping outside the single symbol
  • the pulse shape P type is used to indicate The shape of the pulse to be configured.
  • an embodiment of the present invention provides a filter configuration method, where the method is applied to a terminal device side, including:
  • the filter coefficients are configured according to the pulse parameters of the pulse to be configured.
  • the receiving, by the receiving base station, the pulse parameter of the to-be-configured pulse includes:
  • 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.
  • 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.
  • 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.
  • the OFDM setup parameters include a cyclic prefix length and a subcarrier width.
  • 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 Calculate the preferred receive filter coefficients that maximize the receiver signal to interference and noise ratio SINR RX
  • the channel statistical characteristic, the transmission filter coefficient g TX (t), and the reception filter coefficient ⁇ 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 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.
  • the method further includes:
  • 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 ⁇ 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 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.
  • 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 ⁇ RX (t) through an iterative optimization process; among them:
  • the preferred receive filter coefficients are calculated by the following algorithm.
  • 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 ;
  • the preferred transmit filter coefficients are calculated by the following algorithm.
  • ⁇ 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.
  • the receive filter coefficient g TX (t) and the transmit filter coefficient ⁇ 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
  • 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
  • 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.
  • 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.
  • the performing the pulse forming process on the terminal device side includes:
  • 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:
  • 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 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.
  • the performing the pulse forming process on the base station side includes:
  • 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:
  • 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 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.
  • 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.
  • the notification unit is specifically configured to:
  • the pulse parameters are notified to the terminal device by real-time dynamic signaling.
  • 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.
  • the preset communication scenario that needs to perform 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.
  • 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
  • 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
  • the second value N 2 is used to indicate the number of sampling points for pulse shaping outside the single symbol
  • the pulse shape P type is used to indicate The shape of the pulse to be configured.
  • 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
  • a configuration unit configured to configure a filter coefficient according to the pulse parameter of the pulse to be configured.
  • the receiving unit is specifically configured to:
  • the signaling carries a pulse parameter of the to-be-configured pulse; or the signaling carries indication information of the to-be-configured pulse.
  • 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.
  • the preset communication scenario that needs to perform 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.
  • 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.
  • 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.
  • 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.
  • 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 is the terminal device described in the sixth or ninth aspect of the terminal device.
  • 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.
  • 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.
  • FIGS. 1A-1F are schematic diagrams of several possible application scenarios involved in an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a filter optimization method according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a filter optimization method according to an embodiment of the present invention.
  • FIG. 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.
  • FIG. 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. 14 is a schematic diagram of another implementation block diagram of a receiver according to an embodiment of the present invention.
  • 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.
  • OFDM Numerologies ie, a set of values set by the CP length and subcarrier width of OFDM
  • MBSFN in existing systems uses an extended CP to combat longer channel delay times.
  • 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.
  • UEs user equipments
  • 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).
  • the pulsed processing can be used to reduce the interference experienced by the user.
  • the communication system adjusts the Modulation and Coding Scheme (MCS) in real time according to the channel quality information.
  • MCS Modulation and Coding Scheme
  • 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.
  • 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.
  • 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).
  • the interference due to channel attenuation, non-synchronization, and time-domain jitter can be reduced by pulse shaping processing.
  • PRACH physical random access channel
  • PUSCH physical uplink shared channel
  • PRACH is required compared to PUSCH.
  • the robustness against symbol-level time offset can be achieved by pulse shaping processing.
  • the pulse length corresponding to the filter is equivalent to a plurality of symbol periods.
  • 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.
  • pulse shaping 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) 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
  • 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 ⁇ RX.
  • the transmitting end waveform g TX and the receiving end waveform ⁇ RX are fixed to a rectangular shape by default.
  • 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.
  • FIG. 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:
  • the channel statistical characteristic, the transmission filter coefficient g TX (t), and the reception filter coefficient ⁇ RX (t) are variables that determine the signal-to-interference-and-noise ratio SINR RX of the receiving end.
  • the transmission filter coefficients g TX (t) and the reception filter coefficients ⁇ RX (t) may all be characterized by predefined pulse parameters.
  • the pulse parameter includes all or part of a preset parameter set.
  • the preset parameter set may be as shown in Table 1:
  • ⁇ denotes the roll-off coefficient of the Raised Cosine (RC) filter
  • N CP is the length of the OFDM cyclic prefix
  • N sym is the number of sampling points corresponding to a single symbol period.
  • 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.
  • the first flag Flag head can be used to indicate whether the symbol header is pulse-formed
  • the second flag Flag tail can be used to indicate whether the symbol tail is pulse-formed
  • the first value N 1 is available.
  • the second value N 2 may be used to indicate the number of sampling points for pulse forming outside a single symbol
  • 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.
  • the first flag Flag head indicates that the symbol header is pulse-formed, otherwise the symbol header is not pulse-formed.
  • 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.
  • 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 second flag bit Flag tail indicates that the symbol tail is pulse-formed, otherwise the symbol tail is not pulsed. forming.
  • first enable value and the second enable value may be defined according to actual requirements, and are not limited herein.
  • a set of pulse parameters can correspondingly characterize a specific pulse shape, that is, a filter coefficient (also referred to as a shape factor of a filter).
  • a filter coefficient also referred to as a shape factor of a filter.
  • 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 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:
  • 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 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 ⁇ RX (t) is determined as SINR RX ⁇ H, g TX (t), ⁇ RX (t) ⁇ .
  • 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
  • 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
  • N CP N 1 N 2 36 12 to 16 12 ⁇ 14 72 30 ⁇ 32 24 ⁇ 30 144 60 ⁇ 64 40 ⁇ 60
  • the approximation can also be within a certain range of errors.
  • 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.
  • an optimization process for transmitting filter coefficients according to the received filter coefficients Further optimizing the transmit filter coefficient g TX (t); specifically, at ⁇ RX (t) is equal to
  • g TX (t) Further optimizing the transmit filter coefficient g TX (t); specifically, at ⁇ RX (t) is equal to
  • 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:
  • 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 ⁇ 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.
  • the embodiment of the present invention can also progressively optimize the transmit filter coefficients g TX (t) and the receive filter coefficients ⁇ RX (t) through an iterative optimization process. among them:
  • the (i+1)th iteration may be an optimization process for the reception filter coefficient ⁇ RX (t). Specifically include:
  • the preferred receive filter coefficients can be theoretically calculated by the following algorithm.
  • H is the predetermined channel statistical characteristic, and i is a positive integer;
  • next i+2 round iteration can be a further optimization process for the transmit filter coefficients g TX (t). Specifically include:
  • the preferred transmit filter coefficients can be theoretically calculated by the following algorithm.
  • H is the predetermined channel statistical characteristic, and i is a positive integer;
  • 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:
  • the base station may determine a pulse to be configured for the current communication scenario.
  • 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.
  • the pulse shape supported by the terminal device may include a raised cosine pulse, a Gaussian pulse, a rectangular pulse, and the like.
  • 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.
  • the base station may notify the terminal device of the pulse parameter of the to-be-configured pulse.
  • the pulse parameter can be used to configure a filter coefficient of the terminal device.
  • 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.
  • 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.
  • 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.
  • 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.
  • the preset scenario may also include other communication scenarios that require pulse shaping processing, which is not limited herein.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • the transmission service is a uMTC service
  • 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.
  • the base station may also determine at which end the pulse shaping process is required according to a predefined filter configuration strategy.
  • 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.
  • 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.
  • the pulse modulation 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;
  • the pulse parameter of the pulse to be configured can be used to configure the receiving filter of the terminal device.
  • 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;
  • the pulse parameter of the pulse to be configured can be used to configure the transmission filter of the base station.
  • the pulse parameter may include all or part of a preset parameter set.
  • 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.
  • a set of pulse parameters corresponds to a particular pulse shape.
  • the first flag Flag head can be used to indicate whether the symbol header is pulse-formed
  • the second flag Flag tail can be used to indicate whether the symbol tail is pulse-formed
  • the first value N 1 is available.
  • the second value N 2 may be used to indicate the number of sampling points for pulse forming outside a single symbol
  • 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.
  • 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:
  • 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.
  • the to-be-configured pulses corresponding to the different communication scenarios may be preset.
  • 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.
  • Table 2 statically defining the to-be-configured pulse corresponding to the scenario that needs to limit the out-of-band leakage by the protocol.
  • the pulse parameters of the pulse to be configured may be notified to the terminal device by using the following implementation manners:
  • the pulse parameter may be notified to the terminal device by using dynamic signaling with a fixed period, such as RRC signaling.
  • the pulse parameters may be notified to the terminal device by using real-time dynamic signaling, such as scheduling signaling.
  • 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.
  • 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.
  • the signaling parameter may be directly carried in the signaling; the terminal device may directly perform filter configuration according to the pulse parameter.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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 Calculate the preferred receive filter coefficients that maximize the receiver signal to interference and noise ratio SINR RX
  • the channel statistical characteristic, the transmission filter coefficient g TX (t), and the reception filter coefficient ⁇ RX (t) are variables that determine the signal-to-interference-and-noise ratio SINR RX of the receiving end;
  • 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.
  • the pulse parameter may be all or part of a preset parameter set.
  • 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.
  • 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.
  • first computing unit 603 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.
  • 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, 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 ⁇ RX (t) are variables that determine the transmit signal to interference and noise ratio SINR TX ;
  • 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.
  • 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.
  • 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 ⁇ RX (t) through an iterative optimization process; wherein:
  • the preferred receive filter coefficients are calculated by the following algorithm.
  • 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 ;
  • the preferred transmit filter coefficients are calculated by the following algorithm.
  • ⁇ 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 ;
  • i is a positive integer.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • 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.
  • 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.
  • the pulse parameter may be all or part of a preset parameter set.
  • 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.
  • 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.
  • 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.
  • 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.
  • the pulse modulation 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;
  • the pulse parameter of the pulse to be configured can be used to configure the receiving filter of the terminal device.
  • 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;
  • the pulse parameter of the pulse to be configured can be used to configure the transmission filter of the base station.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the pulse parameter may be all or part of a preset parameter set.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • the first flag Flag head indicates that the symbol header is pulse-formed, otherwise the symbol header is not pulse-formed.
  • 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.
  • 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 second flag bit Flag tail indicates that the symbol tail is pulse-formed, otherwise the symbol tail is not pulsed. forming.
  • first enable value and the second enable value may be defined according to actual requirements, and are not limited herein.
  • 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).
  • the transmitter 10 can be as shown in FIG.
  • 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.
  • the first length may be equal to (N CP + N 2 ).
  • 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.
  • a preset windowing function such as a windowing function indicated by P type
  • 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.
  • the second length may be equal to N 2.
  • 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.
  • the second half of the preset windowing function such as the windowing function indicated by P type
  • 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 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.
  • 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.
  • Y can also be greater than X, which is not limited here.
  • Time Division Duplexing (TDD) technology requires more frequent uplink and downlink switching, usually with a switching period of less than 1 millisecond.
  • TDD Time Division Duplexing
  • 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.
  • 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.
  • the transmitter 10 can be as shown in FIG.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a preset value eg, 2
  • 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 ⁇ .
  • 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).
  • RRC Radio Resource Control
  • 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.
  • 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.
  • FIG. 12 only shows a part of the architecture of the receiver 20.
  • the receiver 20 may further include other modules for signal demodulation and signal reception, which are not described herein.
  • 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.
  • 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.
  • 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).
  • 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.
  • X is a positive integer.
  • the subtraction refers to subtracting X sample points of the tail portion of the previous OFDM symbol in the time domain.
  • 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.
  • 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.
  • the first length may be equal to (N CP + N 2 ).
  • 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.
  • 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.
  • the second length may be equal to N 2.
  • 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 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 .
  • 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.
  • Y can also be greater than X, which is not limited here.
  • 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. 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.
  • 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 ⁇ 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 ⁇ .
  • 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.
  • 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.
  • 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.
  • pulse shaping is required at a preset time.
  • 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.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé d'optimisation de filtre, un procédé de configuration de filtre et un dispositif et un système associés. Le procédé d'optimisation de filtre consiste à : selon une exigence de rapport de fuite de canal adjacent cible, déterminer un coefficient de filtre de transmission g(o) RX(t) satisfaisant l'exigence de rapport de fuite de canal adjacent cible; selon une propriété statistique de canal définie H et g(o) RX(t) satisfaisant l'exigence de rapport de fuite de canal adjacent cible, analyser un coefficient de filtre de réception préféré γ(o) RX(t) maximisant un rapport signal sur interférence plus bruit SINRRX d'une extrémité de réception; utiliser une fonction de fenêtre connue pour approcher le coefficient de filtre de réception préféré γ(o) RX(t) afin d'obtenir un coefficient de filtre de réception γ(1) RX(t) similaire au coefficient de filtre de réception préféré γ(o) RX(t), le coefficient de filtre de réception γ(1) RX(t) étant utilisé pour configurer un filtre au niveau de l'extrémité de réception. La solution peut améliorer un rapport signal sur interface plus bruit, ainsi que les performances de communication.
PCT/CN2017/078992 2016-03-31 2017-03-31 Procédé d'optimisation de filtre, procédé de configuration de filtre, et dispositif et système associés WO2017167269A1 (fr)

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CN101026373A (zh) * 2006-02-21 2007-08-29 上海无线通信研究中心 一种双正交滤波器设计方法及其设计装置
CN101772917A (zh) * 2007-08-06 2010-07-07 交互数字专利控股公司 用于egprs-2的脉冲整形
CN103368635A (zh) * 2012-03-30 2013-10-23 株式会社Ntt都科摩 发送滤波器计算器、通信设备和方法
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