WO2018130017A1 - Signal design method and system for ofdm communication, transmitter, and receiver - Google Patents

Abstract

Disclosed are a signal design method and system for OFDM communication, a transmitter, and a receiver, to solve the problem in the related art that the random access procedure in OFDM communication has a large signaling overhead and cannot support high-density terminal communication. The method comprises: dividing roots of a preamble ZC sequence allocated to a target cell into at least two groups, and applying different orthogonal codes to each group of roots to form a preamble resource pool; selecting a corresponding preamble resource from the preamble resource pool to generate a preamble portion of a communication signal of a user equipment; generating a data portion of the communication signal of the user equipment by applying an extended code to transmission data to realize multi-user concurrent access; and combining the preamble portion and the data portion into frames.

Description

Signal design method and system for OFDM communication, transmitter, receiver Technical field

The present application relates to the field of communication technologies, such as a signal design method and system for OFDM communication, a transmitter, and a receiver.

Background technique

The Internet of Things application is one of the main application scenarios of 5G communication. Specific application examples include public utility meter reading, environmental data monitoring, and logistics tracking. Its service characteristics are: the number of terminals is large, sporadic data packets, and the data rate is low. These business characteristics place new demands on the corresponding signal design and transceiver devices: low-cost overhead, low power consumption, and support for large connections.

The related LTE uplink signal design and access procedures are not applicable to the above IoT service applications. The reasons are as follows:

1. The related LTE random access procedure requires multiple interactions between the upstream and downstream MSG1 to MSG5. In this way, if the incidental packet service is used for the Internet of Things application, the ratio of the current cost to the entire system resource will be too large.

2. For the IoT terminal, according to the relevant LTE random access procedure, in order to send a small amount of data, multiple random access processes of the interaction between the present and the present are required, and the power consumption requirement for the terminal is high.

3.5G requires support for 1 million/km^2 IoT terminal density. This terminal density makes the service model and the related LTE service model different, and the base station must support more dense concurrent access requests.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The present disclosure provides a signal design method and system for OFDM (Orthogonal Frequency Division Multiplexing) communication, a transmitter, and a receiver, which are used to solve the problem of random access process in OFDM communication in the related art. The problem is that it is expensive and cannot support high-density terminal communication.

In one aspect, the present disclosure provides a signal design method for OFDM communication, including: dividing a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, and applying different roots to each group root in the preamble sequence Orthogonal code to form a preamble resource pool; selecting a corresponding preamble resource from the preamble resource pool to generate a preamble portion of a communication signal of the user equipment; and generating a data portion of the communication signal of the user equipment by applying a spreading code to the transmission data, To implement concurrent access by a multi-user device; combining the preamble portion and the data portion into a frame.

In another aspect, the present disclosure also provides a signal design method for OFDM communication, comprising: performing preamble detection on a preamble portion of a received communication signal of a user equipment; wherein the communication signal includes the preamble portion and data Part: the preamble portion includes an orthogonal code; the data portion is generated by applying a spreading code on the original data symbol; and corresponding data is received according to a correspondence between the preamble portion and the data portion.

In another aspect, the present disclosure further provides a transmitter configured to divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, and apply different orthogonal codes to each group root of the preamble ZC sequence respectively. Forming a preamble resource pool, the transmitter includes: a preamble generating unit, configured to select a preamble resource from the preamble resource pool to generate a preamble portion of a communication signal of the user equipment; and a data generating unit configured to transmit by using The data application spreading code generates a data portion of the communication signal of the user equipment to implement concurrent access by the multi-user device; the framing unit is configured to combine the leading portion and the data portion into a frame.

In another aspect, the present disclosure further provides a receiver, including: a preamble detecting unit configured to perform preamble detection on a preamble portion of a received communication signal of a user equipment; wherein the communication signal includes a preamble portion and a data portion; The preamble portion includes an orthogonal code; the data portion is generated by applying a spreading code on the original data symbol; and the data receiving unit is configured to perform corresponding data according to a correspondence between the preamble portion and the data portion receive.

In another aspect, the present disclosure also provides an OFDM communication system including a transmitter and a receiver; the transmitter configured to divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, for a preamble Each group of roots of the ZC sequence respectively applies a different orthogonal code to form a preamble resource pool; the transmitter is further configured to: select a corresponding preamble resource from the pool of the preamble resources to generate a leading part of the communication signal of the user equipment; Applying a spreading code to the transmission data to generate a data portion of the communication signal of the user equipment to implement concurrent access by the multi-user equipment; combining the preamble portion and the data portion into a frame; the receiver is configured to: receive Preamble detection of the communication signal of the user equipment to the preamble; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion is generated by applying a spreading code on the original data symbol; Corresponding data reception is performed according to the correspondence between the preamble portion and the data portion.

The present disclosure also provides a transmitter including a processor for performing data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, the memory configured to store signals for implementing OFDM communication An instruction of the design method, the processor being configured to execute the instruction stored by the memory, dividing a root of a preamble ZC sequence to which the target cell is allocated into at least two groups, each group root of the preamble ZC sequence applying a different positive Transmitting to form a pool of preamble resources, when the processor executes the instruction stored by the memory, performing the step of: selecting a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; Applying a spreading code to the transmission data to generate a data portion of the communication signal of the user equipment to implement concurrent access by the multi-user device; combining the preamble portion and the data portion into a frame.

In another aspect, the present disclosure also provides a receiver comprising a processor for performing data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, the memory configured to be implemented for storage An instruction of a signal design method of OFDM communication, the processor being configured to execute an instruction stored by the memory, and when the processor executes the instruction stored by the memory, performing the step of: receiving the user equipment The preamble portion of the communication signal performs preamble detection; wherein the communication signal includes the preamble portion and the data portion; the preamble portion includes an orthogonal code; the data portion is generated by applying a spreading code on the original data symbol; Corresponding data is received by the correspondence between the preamble portion and the data portion.

According to an embodiment of the present disclosure, there is provided a computer readable storage medium storing computer executable instructions configured to perform the above method.

The signal design method and system for OFDM communication provided by the embodiments of the present disclosure, the transmitter, and the receiver adopt a compact structure in which a preamble portion and a data portion are adjacently arranged, so that the base station can be completed at one time. The process of user equipment discovery and data reception eliminates multiple access message interactions and effectively improves communication efficiency. At the same time, because the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment, the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment. Greatly improved the spectrum efficiency of the whole network.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

FIG. 1 is a flowchart of a signal design method for OFDM communication provided by an embodiment of the present disclosure;

2 is a schematic diagram of a time domain structure of an uplink signal of a physical layer in an embodiment of the present disclosure;

3 is another flowchart of a signal design method for OFDM communication provided by an embodiment of the present disclosure;

4 is a flowchart of operations performed by a transmitting end in a signal design method for OFDM communication provided by an embodiment of the present disclosure;

5 is a flowchart of operations performed by a receiving end in a signal design method for OFDM communication provided by an embodiment of the present disclosure;

6 is a schematic diagram of a time domain structure of an uplink signal of a physical layer in an embodiment of the present disclosure;

7 is a schematic diagram of a time domain structure of an uplink signal of a physical layer in another embodiment of the present disclosure;

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

FIG. 9 is a schematic structural diagram of a receiver provided by an embodiment of the present disclosure.

detailed description

The present disclosure will be described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to be limiting.

As shown in FIG. 1 , an embodiment of the present disclosure provides a signal design method for OFDM communication, which includes dividing a root of a leading Zadoff-Chu (ZC) sequence to which a target cell is allocated into at least two groups, for each group. The roots respectively apply different orthogonal codes to form a pool of preamble resources, and the method further includes:

S11. Select a corresponding preamble resource from the pool of preamble resources to generate a leading part of a communication signal of the user equipment.

S12, generating a data part of the communication signal of the user equipment by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user equipment;

S13, combining the preamble portion and the data portion into a frame.

A signal design method for OFDM communication provided by an embodiment of the present disclosure adopts a preamble portion and a data portion together to form a frame to form a compact structure of adjacent placement, and the preamble portion can be used for operation of user equipment discovery, frequency offset estimation, and the like. Therefore, the base station can complete the process of user equipment discovery and data reception in one time, eliminating multiple access message interactions, and effectively improving communication efficiency. At the same time, because the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment, the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment. Greatly improved the spectrum efficiency of the whole network.

Optionally, in an embodiment of the disclosure, the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.

Specifically, the base station may provide a preamble resource pool for each cell served by the base station, so that the user equipment can select a corresponding preamble resource to communicate in the corresponding preamble resource pool. The pilot resource pool allocated by each cell is different. Alternatively, the preamble resources in the pool of preamble resources may be generated by a preamble ZC sequence. In order to obtain a suitable preamble ZC sequence, before the root of the preamble ZC sequence to which the target cell is allocated is divided into at least two groups, and different orthogonal codes are respectively applied to each group root to form a preamble resource, the embodiment of the present disclosure provides The signal design method for OFDM communication may further include: generating a ZC sequence of a corresponding length according to a number of available subcarriers of the preamble portion in a target cell time-frequency resource, the ZC sequence having a preset number of roots. When the number of roots of the ZC sequence is less than the number of available subcarriers in the preamble resource pool, a cyclic shift can be applied to the corresponding ZC sequence to provide multiple access resources on a single root.

For example, in an embodiment of the present disclosure, the transmitting end has the following resources: in the time domain, the preamble and the data each occupy one subframe with a duration of 1 ms, and the total duration is 2 ms. The preamble subframe includes a zero-padding interval of 0.1375 ms and three consecutive preamble symbols. The length of a single preamble symbol (including the cyclic prefix CP) is 0.2875 ms. The data sub-frame contains 14 data symbols, which are in accordance with the relevant LTE system definition. In the frequency domain, the system bandwidth is 720 kHz, and the preamble subcarrier spacing is 3.75 kHz, data. The symbol subcarrier spacing is 15 kHz. The number of available subcarriers in the preamble is 192, and the number of available subcarriers in the data portion is 48. The number of available subcarriers in the preamble is 192, and a number of preset sequences of length 192 can be generated. In this embodiment, the preamble portion adopts a ZC sequence, and the root sequence length is 191, and the loop is extended to a length of 192 to occupy 192 subcarriers.

In a case where the leading ZC sequence allocated by the target cell has multiple roots, the roots of the leading ZC sequence to which the target cell is allocated may be divided into at least two groups, and different orthogonal codes are respectively applied to each group root to form a preamble. The resource pool, the length of the orthogonal code can be equal to the number of packets of the root. At the same time, since different orthogonal codes are applied to each group root, the hetero root interference is also suppressed, including interference from the alien root user equipment in the cell and/or interference originating from the heterogeneous user equipment between the cells.

Optionally, in the frequency domain, the manner in which the preamble portion occupies the subcarrier may include:

The preamble portion is placed consecutively on all subcarriers of the occupied bandwidth; or

The preamble portions are equally spaced across the subcarriers over the occupied bandwidth to form a comb structure.

Correspondingly, according to the manner in which the preamble portion is placed on the subcarrier, the root of the preamble ZC sequence to which the target cell is allocated is divided into at least two groups, and different orthogonal codes are respectively applied to each group root to form a preamble resource pool. It can include the following steps:

其中

为目标小区被分配的前导ZC序列的根的个数，

为所述目标小区单根上配置的可用循环移位个数；将所述前导ZC序列的根分组，并对所述前导ZC序列的各组根应用不同的正交码，分组个数等于正交码长度；If the preamble portion is continuously placed on all subcarriers of the occupied bandwidth, the size of the preamble resource pool is

among them

The number of roots of the leading ZC sequence allocated for the target cell,

And a number of available cyclic shifts configured on a single root of the target cell; grouping roots of the preamble ZC sequence, and applying different orthogonal codes to each group root of the preamble ZC sequence, the number of packets being equal to orthogonal Code length

其中

为梳状结构分出来的子载波组的个数；将每个资源子池上的根分组，并对每个资源子池上的各组根应用不同的正交码，分组个数等于正交码长度，且每个资源子池所使用的的正交码组相同。If the preamble portion is equally spaced across the subcarriers and forms a comb structure over the occupied bandwidth, each subcarrier group of the comb structure constitutes an orthogonal preamble time-frequency resource sub-pool, and is grouped according to the following rules. Orthogonal code application: when the target cell is configured to apply all the roots of the preamble ZC sequence to all resource subpools, the size of the preamble resource pool is determined as

among them

The number of subcarrier groups divided for the comb structure; group the roots on each resource subpool, and apply different orthogonal codes to each group root on each resource subpool, the number of packets being equal to the orthogonal code length And the orthogonal code groups used by each resource subpool are the same.

其中

为第i个资源子池中所应用的根个数；将每个资源子池上的所有根分组，并对每个资源子池上的各组根应用不同的正交码，分组个数等于正交码长度，每个资源子池所使用的的正交码组相同。The size of the preamble resource pool is configured when the target cell is configured to apply different roots to different resource sub-pools, and at least one different root is applied to at least one resource sub-pool, and all the roots are used. Determined as

among them

Is the number of roots applied in the i-th resource sub-pool; group all roots on each resource sub-pool, and apply different orthogonal codes to each group root on each resource sub-pool, the number of packets is equal to orthogonal The code length is the same for each resource subpool.

After the preamble resource pool is formed, the preamble part of the communication signal of the user equipment may be generated by selecting the corresponding preamble resource from the pool of the preamble resources, which may include:

And selecting a preamble resource from the pool of the preamble resources to generate a preamble sequence of the user equipment;

Performing an IFFT transform on the selected preamble sequence to form a preamble symbol in the time domain, and repeating the preamble symbol at least twice in the time domain to obtain at least two preamble symbols;

A corresponding orthogonal code is applied to the at least two preamble symbols to generate a preamble portion of the communication signal of the user equipment.

Optionally, when the orthogonal code is applied to the preamble symbol, the length of the orthogonal code may be less than or equal to the number of repetitions of the preamble symbol, and in a case where the length of the orthogonal code is less than the number of repetitions of the preamble symbol, The orthogonal code is applied to all preamble symbols in an at least partially repeated manner.

，本例中

)。因此，对于任意1个终端用户设备(UE)，其可用前导资源池为4*32＝128个。For example, in one embodiment of the present disclosure, the preamble portion includes three preamble symbols, and each of the preamble symbols additionally applies one delay deflection sequence, the length of which is also 192, and the granularity of the delay deflection angle is 2π/32. For any cell, four ZC root sequences are assigned to it (for example, u={1, 2, 3, 4}), and 32 delay deflection sequences can be applied to each root sequence (ie,

In this case

). Therefore, for any one end user equipment (UE), the available preamble resource pool is 4*32=128.

Then the generation process of the above preamble sequence is as follows:

0≤n≤N_ZC一1，本例中N_ZC＝191。Step 1: Generate the root sequence as

0≤n≤N _ZC-1, in the present embodiment N _ZC = 191.

Step 2: cyclically expand the root sequence to generate a base sequence:

y _u (n)=[x _u (0)x _u (1)...x _u (N _ZC -1)x _u (0)], according to the sequence in this example, is cyclically extended to a sequence of length 192.

其中0≤n≤N_ZC-1。 Step 3: delay the deflection of the base sequence, and load the delay deflection sequence as

Where 0 ≤ n ≤ N _ZC -1.

Each time the data is sent, the UE can randomly select one u and one n _CS from the available resources of the preamble to construct its preamble sequence. If u is an odd number, then 3 consecutive preamble symbols apply an orthogonal code [+1 +1 +1] in the time domain. If u is even, then 3 consecutive preamble symbols apply the orthogonal code [+1 -1 +1] in the time domain. It can be seen that the codes of two adjacent preamble symbols constitute an orthogonal pair having a code length of two.

Specifically, in step S13, the data part of the communication signal of the user equipment may be generated by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user equipment, which may include the following steps:

Modulating transmission data of the user equipment into original data symbols;

A spreading code is applied to the original data symbols for data expansion to form a data portion of the communication signal.

Specifically, in this embodiment, the data part may be extended by MUSA, specifically a complex value spreading code with a code length of 4. At this time, the resource pool size of the spreading code is also set to 128, and the corresponding spreading code can be randomly selected from the spreading code resource pool. Optionally, in this embodiment, the preamble resource and the spreading code resource adopt a one-to-one binding. That is, when the user equipment selects the preamble resource from the preamble resource pool, the extension code of the data part is also determined.

After the extension of the complex value spreading code having the code length of 4, each original modulation symbol is expanded into four modulation symbols including spreading codes, and the expanded modulation symbols are placed in a frequency domain after the frequency domain. With the above non-orthogonal extension, the data symbols of a plurality of user equipments can therefore be simultaneously transmitted to the base station.

Optionally, the application of the spreading code on each original data symbol may include an application only in the time domain, an application only in the frequency domain, or an application in the time domain and the frequency domain.

个连续时频域符号，

为扩展码长度。Specifically, the application only in the time domain includes: expanding the original modulation symbol into 1 _code consecutive time domain symbols in the time domain, where l _code is a spreading code length; the application only in the frequency domain The method includes: expanding the original modulation symbol into 1 _code consecutive frequency domain symbols in the frequency domain, and l _code is a spreading code length; the applying in the time domain and the frequency domain includes: expanding the original modulation symbol into a time-frequency domain.

Continuous time-frequency domain symbols,

For the extension code length.

After forming the preamble portion and the data portion, respectively, they can be combined into a frame in step S14. The signal structure of the communication signal of the composite frame in the time domain may include one of the following: (1) the preamble portion and the data portion are successively placed; (2) the preamble portion and the data portion are respectively divided into multiple And a plurality of segments of the leading portion and the plurality of segments of the data portion are interleaved with each other. Two placements In the formula, the specific structure of the uplink signal of the physical layer can be as shown in FIG. 2 . Among them, the time domain structure of two possible preamble+data is shown. Fig. 2(a) is a time domain structure placed continuously, and Fig. 2(b) is a time domain structure interlaced. For the interleaved time domain structure, FIG. 2 provides only one example, and the number of repetitions is not limited to two.

Optionally, the preamble portion may include at least two preamble symbols, and the data portion may include at least one data symbol.

Alternatively, the preamble portion and the data portion may occupy the same or different bandwidths in the frequency domain, and the frequency domain resources occupied by the preamble portion and the data portion may at least partially overlap. Optionally, the preamble resource corresponding to the preamble part and the spreading code may have a one-to-one or many-to-one mapping relationship.

Correspondingly, as shown in FIG. 3, an embodiment of the present disclosure further provides a signal design method for OFDM communication, where the method is based on a receiving end, including:

S31: Perform preamble detection on a preamble portion of the received communication signal of the user equipment, where the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion is applied by using the original data symbol Extension code generation;

S32. Perform corresponding data reception according to a correspondence between the preamble portion and the data portion.

The signal design method for OFDM communication provided by the embodiment of the present disclosure adopts a combination of a preamble portion and a data portion to form a compact structure of adjacent placement, so that the base station can complete the process of user equipment discovery and data reception at one time, free of Going to multiple access message interactions effectively improves communication efficiency. At the same time, since the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment, the data part adopts the spreading code multiple access technology, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment, which greatly Improve the spectrum efficiency of the entire network.

Optionally, the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.

Specifically, the receiver applies the measurement to the preamble resource, such as detecting at least one user equipment, and applies the corresponding measurement quantity to the subsequent data decoding of the user equipment. Since multiple concurrent user equipment data can be superimposed on the data symbols using non-orthogonal multiple access techniques, the receiver can employ multiple, but not limited to, continuous interference cancellation (SIC) techniques to resolve multiple concurrent user equipment. Optionally, orthogonal code suppression is used Inter-device interference may include interference between user equipments in a cell or between user equipments in a neighboring cell. The embodiments of the present disclosure do not limit this.

Optionally, in step S31, performing preamble detection on the preamble portion of the received communication signal may include:

Compensating for interference in the preamble portion based at least in part on the orthogonal encoding in the preamble portion;

Performing at least one of the following operations on the preamble portion: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.

In particular, the preamble sequence has good autocorrelation and cross-correlation properties, the sequence length of which depends on the total bandwidth and subcarrier spacing occupied. The user equipment at the receiving end finds whether the peak energy obtained by the autocorrelation exceeds a certain threshold. The frequency offset estimation can be obtained by, but not limited to, using a conventional time domain correlation algorithm. In this case, the inter-symbol correlation or the intra-symbol correlation can be determined according to the number of preamble symbols. The time offset estimation can be obtained by, but not limited to, using a conventional frequency domain correlation algorithm. In this case, whether or not to use inter-symbol averaging can be used according to the number of preamble symbols to obtain a more accurate measurement. The noise estimate can be, but is not limited to, utilized in the user equipment discovery phase, without the autocorrelation result of the user equipment being detected. Channel estimation for data demodulation can be obtained by interpolation or averaging of channel estimates on the preamble symbols, depending on how the preamble symbols occupy the subcarriers.

In step S32, corresponding data reception may be performed according to a correspondence between the preamble portion and the data portion. Optionally, the correspondence between the preamble portion and the data portion may include: mapping relationship between a preamble resource of the preamble portion and the spreading code, and occupying a frequency band of the preamble portion and occupying the data portion Correspondence between frequency bands. Alternatively, the preamble portion and the data portion may occupy the same or different bandwidths in the frequency domain; the frequency domain resources occupied by the preamble portion and the data portion may at least partially overlap.

Optionally, the size of the preamble resource pool and the data spreading code resource pool may be inconsistent, and the mapping relationship between the preamble resource and the data spreading code may be one-to-one or many-to-one. The preamble resource and/or orthogonal code resource randomly selected by the user equipment determines the extent of the spreading code used by the data portion of the user equipment. Since the preamble subcarrier spacing can be different from the data symbol subcarrier spacing, the receiving and transmitting ends need to support signal processing of different subcarrier spacings. These signal processing include, but are not limited to, different size FFT modules, up and down sampling filter modules that match corresponding subcarrier spacing, SIC modules, and the like.

Specifically, in step S32, according to the correspondence between the preamble portion and the data portion The corresponding data reception may include:

Obtaining a channel estimate of the data portion from a channel estimate of the preamble portion according to a correspondence between the preamble portion occupied frequency band and the data portion occupied frequency band;

And determining, according to a one-to-one or many-to-one mapping relationship between the preamble resource of the preamble portion and the spreading code of the data portion, the preamble resource learned in the preamble detection to determine a spreading code of the data portion;

Corresponding data reception is performed on all detected user equipments according to the channel estimation of the data portion and the spreading code.

For example, in an embodiment of the present disclosure, the time-frequency resource of the received data is: in the time domain, the preamble and the data each occupy one subframe with a duration of 1 ms, and the total duration is 2 ms. The preamble subframe includes a zero-padding interval of 0.1375 ms and three consecutive preamble symbols. The length of a single preamble symbol (including the cyclic prefix CP) is 0.2875 ms. The data sub-frame contains 14 data symbols, which are in accordance with the relevant LTE system definition. In the frequency domain, the system bandwidth is 720 kHz, the preamble symbol subcarrier spacing is 3.75 kHz, and the data symbol subcarrier spacing is 15 kHz. The number of available subcarriers in the preamble is 192, and the number of available subcarriers in the data portion is 48.

For the received data, a certain front-end processing may be performed first, which may specifically include:

The three preamble symbols in the time domain are extracted, the CP is removed, and the FFT transform frequency domain is obtained, and three frequency domain sequences are obtained.

For the above three columns of frequency domain sequences, the ZC base sequence (length 192) corresponding to each root is sequentially used for local sequence conjugate compensation.

Adding the first and second columns (ie, the first and second preamble symbols) to the compensated frequency domain sequence, and adding the second and third columns (ie, the second and third preamble symbols), Get the combined value on the 2 column frequency domain. It can be seen that the orthogonal codes of two adjacent preamble symbols eliminate the interference on the other two roots whose parity is inconsistent. For example, on root 1, there is only interference on stub 3, and the preambles that may exist on roots 2 and 4 are eliminated because of orthogonal codes.

The above two columns of frequency domain combined values are respectively subjected to Inverse Fast Fourier Transform (IFFT) to return to the time domain.

After the front-end processing is performed, the pre-detection detection may be performed, which may specifically include:

The noise floor and the detection threshold are calculated using the 2-line time domain values obtained by the above IFFT transformation.

The energy is obtained for each sample of the above two rows of time domain values, and then the corresponding points are summed to become one row time domain value, and then multi-antenna combining is performed to construct a preamble detection index, which is compared with the detection threshold.

For the above 1 row time domain value, perform preamble detection in each time window, output the detected UE, and sort by the power in the window from large to small.

For the detected UEs, the respective time offsets, frequency offsets, and channel estimation values are calculated in order.

The data can be received according to the preamble detection result, which may specifically include:

For all of the above-described detection UEs, the reception of the data portion is performed in order.

The channel estimated by the current UE preamble (corresponding to the subcarrier spacing of 3.75 kHz) is taken, and each successive value is linearly averaged to obtain a channel estimation value corresponding to the 15 kHz subcarrier spacing.

For the above channel estimation values, interpolation in the time domain is performed to obtain channel estimation values on each data symbol.

The channel estimation value after the interpolation is applied point by point according to the spreading code corresponding to the current UE preamble for subsequent equalization.

The data portion is equalized using the above-mentioned expanded channel estimation value, and then each successive 4 values are combined for despreading to obtain an equalized modulation symbol.

Perform normal operations such as soft demodulation, decoding, CRC check, etc. on the above modulation symbols, and finally obtain a transmit data bit stream and a corresponding CRC check result.

If the CRC check result is correct, the current user equipment frequency domain data is reconstructed and the SIC cancellation operation is performed.

The next detected UE repeats the above operation until all UEs are processed.

The signal design method for OFDM communication provided by the present disclosure will be described in detail below through specific embodiments.

The embodiment of the present disclosure provides a signal design method for OFDM communication, and the operation flow performed by the transmitting end may be as shown in FIG. 4, and the operation flow performed by the receiving end may be as shown in FIG. 5.

Based on the flow shown in FIG. 4 and FIG. 5, when the time domain resources and the frequency domain resources available at the transmitting end and the receiving end are different, the specific signal design method is also slightly different. The following is explained in detail by several embodiments.

Example 1

Take the LTE narrowband Internet of Things system based on frequency domain extension as an example.

Time-frequency resources

In the time domain, the preamble and the data each occupy a subframe of 1 ms duration, and the total duration is 2 ms. The preamble subframe includes a zero-padding interval of 0.1375 ms and three consecutive preamble symbols. The length of a single preamble symbol (including the cyclic prefix CP) is 0.2875 ms. The data sub-frame contains 14 data symbols, which are in accordance with the relevant LTE system definition. The specific time domain structure of the uplink signal is shown in FIG. 6. In Fig. 6, according to the parity of the root, [C1 C2] = [+1 +1] or [+1 -1], [C2 C3] = [+1 +1] or [-1 +1]. It can be seen that the three preamble symbols are divided into two groups, each group contains two adjacent preamble symbols, and each group applies an orthogonal code with a code length of two, and the orthogonal code elements on the overlapping symbols need to maintain the consistency between the groups.

In the frequency domain, the system bandwidth is 720 kHz, the preamble symbol subcarrier spacing is 3.75 kHz, and the data symbol subcarrier spacing is 15 kHz. The number of available subcarriers in the preamble is 192, and the number of available subcarriers in the data portion is 48.

Transmit signal design

本例中

)。因此，对于任意1个终端用户设备(UE)，其可用前导资源池为4*32＝128个。The preamble symbol uses a ZC sequence with a root sequence length of 191, and the loop is extended to a length of 192 to occupy 192 subcarriers. An additional delay deflection sequence is applied to each preamble, the length of which is also 192, and the granularity of the delay deflection angle is 2π/32. For any cell, four ZC root sequences are assigned to it (for example, u={1, 2, 3, 4), and 32 delay deflection sequences can be applied to each root sequence (ie,

In this case

). Therefore, for any one end user equipment (UE), the available preamble resource pool is 4*32=128.

The above preamble sequence is generated as follows:

0≤n≤N_ZC一1，本例中N_ZC＝191。Root sequence is

0≤n≤N _ZC-1, in the present embodiment N _ZC = 191.

The base sequence is y _u (n)=[x _u (0) x _u (1)...x _u (N _ZC -1) x _u (0)], and the sequence in this example is cyclically expanded into a sequence of length 192.

其中0≤n≤N_ZC-1。The sequence loaded with the delay deflection is

Where 0 ≤ n ≤ N _ZC -1.

Each time the data is sent, the UE randomly selects 1 u and 1 n _CS to construct its preamble sequence. If u is an odd number, then 3 consecutive preamble symbols apply an orthogonal code [+1 +1 +1] in the time domain. If u is an even number, then 3 consecutive preamble symbols apply an orthogonal code [+1 -1 +1] in the time domain. It can be seen that the codes of two adjacent preamble symbols constitute an orthogonal pair having a code length of two.

The data part is extended by MUSA, specifically a complex value spreading code with a code length of 4. At this time, the resource pool size of the spreading code is also set to 128, and the preamble resource and the spreading code resource are bound by one-to-one correspondence. That is, when the user equipment selects the preamble resource, the extension code of the data part is also determined.

After the extension of the complex value spreading code having the code length of 4, each original modulation symbol is expanded into four modulation symbols including spreading codes, and the expanded modulation symbols are placed in a frequency domain after the frequency domain. With the above non-orthogonal extension, the data symbols of a plurality of user equipments can therefore be superimposed and multiplexed together and transmitted to the base station.

Receiver design

The receiver process includes the following steps:

Front-end processing

The three preamble symbols in the time domain are extracted, the CP is removed, and the fast Fourier transform FFT is performed to transform into the frequency domain, and three frequency domain sequences are obtained.

For the above three columns of frequency domain sequences, the ZC base sequence (length 192) corresponding to each root is sequentially used for local sequence conjugate compensation.

Adding the first and second columns (ie, the first and second preamble symbols) to the compensated frequency domain sequence, and adding the second and third columns (ie, the second and third preamble symbols) Get the combined value on the 2 column frequency domain. It can be seen that the orthogonal codes of two adjacent preamble symbols eliminate the interference on the other two roots whose parity is inconsistent. For example, on root 1, there is only interference on stub 3, and the preambles that may exist on roots 2 and 4 are eliminated because of orthogonal codes.

The above two columns of frequency domain combined values are separately subjected to IFFT transformation to return to the time domain.

Lead detection

The noise floor and the detection threshold are calculated using the 2-line time domain values obtained by the above IFFT transformation.

The energy is obtained for each sample of the above two rows of time domain values, and then the corresponding points are summed to become one row time domain value, and then multi-antenna combining is performed to construct a preamble detection index, which is compared with the detection threshold.

For the above 1 row time domain value, perform preamble detection in each time window, output the detected UE, and press the window. The internal power is sorted from large to small; for the detected UE, the time offset, frequency offset and channel estimation value are calculated according to the ranking.

Data reception

For all of the above-described detection UEs, the reception of the data portion is performed in order.

The channel estimated by the current UE preamble (corresponding to the subcarrier spacing of 3.75 kHz) is taken, and each successive value is linearly averaged to obtain a channel estimation value corresponding to the 15 kHz subcarrier spacing.

For the above channel estimation values, interpolation in the time domain is performed to obtain channel estimation values on each data symbol.

The channel estimation value after the interpolation is applied point by point according to the spreading code corresponding to the current UE preamble for subsequent equalization.

The data portion is equalized using the above-mentioned expanded channel estimation value, and then each successive 4 values are combined for despreading to obtain an equalized modulation symbol.

Perform normal operations such as soft demodulation, decoding, CRC check, etc. on the above modulation symbols, and finally obtain a transmit data bit stream and a corresponding CRC check result.

If the CRC check is correct, the current user equipment frequency domain data is reconstructed and the SIC cancellation operation is performed.

The next detected UE repeats the above operation until all UEs are processed.

In this embodiment, through the compact structure of the preamble + data, functions such as user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation are completely included in the uplink sporadic packet. The base station can complete the process of user equipment discovery and data reception in one time, and avoids multiple access message interactions. The application of orthogonal codes in the preamble can effectively suppress multi-user equipment interference, making each measurement more accurate and facilitating subsequent data demodulation of multi-user equipment. The data symbol is applied to the orthogonal/non-orthogonal multiple access technology, so that the base station can support the data transmission of the concurrent user equipment, which can reduce the delay of the data transmission by the user equipment and improve the spectrum efficiency of the entire network. The correspondence between the preamble resource and the data resource enables the base station to determine the data part spreading code or the low complexity blind detection to determine the data part spreading code after successfully detecting the preamble.

Example 2

Take the LTE narrowband Internet of Things system based on time domain extension as an example.

Time-frequency resources

In the time domain, the preamble and the data each occupy 4 subframes with a duration of 1 ms, which are staggered according to a 2 ms structure. Each 2ms preamble segment includes a zero-padded interval of 0.2875ms and two consecutive preamble symbols. The length of a single preamble symbol (including the cyclic prefix CP) is 0.85625ms. Each 2ms data segment contains 28 data symbols, that is, every 1ms structure conforms to the relevant LTE system definition. The specific time domain structure of the uplink signal is shown in Figure 7. In Fig. 7, [C1 C2] = [+1 +1] or [+1 -1] according to the parity of the root. The leading portion 1 and the leading portion 2 are completely repeated. It can be seen that the four preamble symbols are divided into two groups that do not overlap, each group contains two adjacent preamble symbols, and each group applies an orthogonal code with a code length of two. The contents of the data portion 1 and the data portion 2 are different, and the expanded modulation symbols are divided into equal-sized two blocks and placed after the corresponding leading portions.

In the frequency domain, the system bandwidth is 180 kHz, the preamble symbol subcarrier spacing is 1.25 kHz, and the data symbol subcarrier spacing is 15 kHz. The number of available subcarriers in the preamble is 144, and the number of available subcarriers in the data portion is 12.

Transmit signal design

本例中

)。因此，对于任意1个终端用户设备(UE)，其可用前导资源池为4*24＝96个。The preamble symbol uses a ZC sequence whose root sequence length is 139 and the loop is extended to a length of 144 to occupy 144 subcarriers. An additional delay deflection sequence is applied to each preamble symbol, which is also 144 in length, and the granularity of the delay deflection angle is 2π/24. For any one cell, four ZC root sequences are assigned to it (for example, u={1, 2, 3, 4), and 24 delay deflection sequences can be applied to each root sequence (ie,

In this case

). Therefore, for any one end user equipment (UE), the available preamble resource pool is 4*24=96.

The above preamble sequence is generated as follows:

0≤n≤N_ZC一1，本例中N_ZC＝139。Root sequence is

0≤n≤N _ZC-1, in the present embodiment N _ZC = 139.

The base sequence is y _u (n)=[x _u (0)x _u (1)...x _u (N _ZC -1)x _u (0)x _u (1)...x _u (4)], as in this example The middle sequence loop is expanded to a sequence of length 144.

其中0≤n≤N_ZC-1。The sequence loaded with the delay deflection is

Where 0 ≤ n ≤ N _ZC -1.

Each time the data is sent, the UE randomly selects 1 u and 1 n _CS to construct its preamble sequence. If u is an odd number, then 2 consecutive preamble symbols apply an orthogonal code [+1 +1] in the time domain. If u is an even number, two consecutive preamble symbols apply an orthogonal code [+1 -1] in the time domain. It can be seen that the codes of two adjacent preamble symbols constitute an orthogonal pair having a code length of two.

The data part is extended by MUSA, specifically a complex value spreading code with a code length of 4. At this time, the resource pool size of the spreading code is also set to 96, and the preamble resource and the spreading code resource are bound by one-to-one correspondence. That is, when the user equipment selects the preamble resource, the extension code of the data part is also determined.

After the extension of the complex value spreading code with the code length of 4, each original modulation symbol is expanded into four modulation symbols including a spreading code, and the expanded modulation symbols are placed in a frequency domain of the first time domain. With the above non-orthogonal extension, the data symbols of a plurality of user equipments can therefore be superimposed and multiplexed together and transmitted to the base station.

Receiver design

The receiver process includes the following steps:

Front-end processing

The four preamble symbols in the time domain are extracted, the CP is removed, and the FFT is performed to transform into the frequency domain, and four frequency domain sequences are obtained.

For the above four columns of frequency domain sequences, the ZC base sequence (length 144) corresponding to each root is sequentially used for local sequence conjugate compensation.

Adding the first and second columns (ie, the first and second preamble symbols) to the compensated frequency domain sequence, and adding the third and fourth columns (ie, the third and fourth preamble symbols) Get the combined value on the 2 column frequency domain. It can be seen that the orthogonal codes of two adjacent preamble symbols eliminate the interference on the other two roots whose parity is inconsistent. For example, on root 1, there is only interference on stub 3, and the preambles that may exist on roots 2 and 4 are eliminated due to different orthogonal codes.

The above two columns of frequency domain combined values are respectively subjected to IFFT transformation to return to the time domain.

Lead detection

The noise floor and the detection threshold are calculated using the 2-line time domain values obtained by the above IFFT transformation.

The energy is obtained for each sample of the above two rows of time domain values, and then the corresponding points are summed to become one row time domain value, and then multi-antenna combining is performed to construct a preamble detection index, which is compared with the detection threshold.

For the above 1 row time domain value, perform preamble detection in each time window, output the detected UE, and press the window. Internal power sorted from large to small

For the above-mentioned detected UEs, the respective time offsets, frequency offsets, and channel estimation values are calculated in order.

Data reception

For all of the above-described detection UEs, the reception of the data portion is performed in order.

The channel estimated by the current UE preamble (corresponding to the subcarrier spacing of 1.25 kHz) is taken, and each successive 12 values are linearly averaged to obtain a channel estimation value corresponding to the 15 kHz subcarrier spacing.

For the above channel estimation values, interpolation in the time domain is performed to obtain channel estimation values on each data symbol.

The channel estimation value after the interpolation is applied point by point according to the spreading code corresponding to the current UE preamble for subsequent equalization.

The data portion is equalized using the above-mentioned expanded channel estimation value, and then each successive 4 values are combined for despreading to obtain an equalized modulation symbol.

Perform normal operations such as soft demodulation, decoding, CRC check, etc. on the above modulation symbols, and finally obtain a transmit data bit stream and a corresponding CRC check result.

If the CRC check result is correct, the current user equipment frequency domain data is reconstructed and the SIC cancellation operation is performed.

The next detected UE repeats the above operation until all UEs are processed.

Example 3

The LTE narrowband Internet of Things system based on frequency domain extension, and a 2-to-1 preamble-spreading code mapping is taken as an example.

The time-frequency resource is the same as in Embodiment 1.

Transmit signal design

The leading symbol design is the same as in the first embodiment.

The data part is extended by MUSA, specifically a complex value spreading code with a code length of 4. At this time, the resource pool size of the spreading code is set to 64, and the smaller resource pool means that the average correlation between the spreading codes is lower, that is, the non-orthogonal interference of the data portion is smaller. At this time, the preamble resource and the spreading code resource adopt a 2-to-1 binding. That is, when the user equipment selects the preamble resource, the extension code of the data part is also determined. Selected differently For the user equipment, it is possible that the extension code is the same. In this way, the user equipment can obtain the respective measurement quantity and channel estimation value without the collision of the preamble, and then use the power domain degree of freedom to solve the respective data through the SIC receiver processing.

The expansion and multiplexing of the original modulation symbols are the same as in Embodiment 1.

The receiver design receiver flow is the same as in Embodiment 1.

Correspondingly, as shown in FIG. 8 , an embodiment of the present disclosure further provides a transmitter, where the roots of the preamble ZC sequence to which the target cell is allocated are divided into at least two groups, and different orthogonal codes are respectively applied to each group root. Form a pool of leading resources, including:

The preamble generating unit 81 is configured to select a preamble resource from the preamble resource pool to generate a preamble portion of the communication signal of the user equipment;

The data generating unit 82 is configured to generate a data part of the communication signal of the user equipment by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user equipment;

A framing unit 83 is configured to combine the preamble portion and the data portion into a frame.

The transmitter provided by the embodiment of the present disclosure adopts a combination of a preamble portion and a data portion to form a compact structure for adjacent placement, and the preamble portion can be used for operation of user equipment discovery, frequency offset estimation, etc., so that the base station can be completed in one time. The process of user equipment discovery and data reception eliminates multiple access message interactions and effectively improves communication efficiency. At the same time, because the preamble part contains orthogonal codes to suppress multi-user equipment interference, the data part adopts multiple access technology of orthogonal/non-orthogonal spreading codes, so that the base station can support concurrent user equipment data transmission, thereby effectively reducing users. The device sends data delay, which greatly improves the spectrum efficiency of the entire network.

Optionally, the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.

Optionally, in the combined frame, the preamble portion and the data portion are consecutively placed in a time domain, or the preamble portion and the data portion are respectively divided into a plurality of segments, and the preamble portion is The segments and the plurality of segments of the data portion are interleaved with each other.

Optionally, the preamble portion includes at least two preamble symbols, and the data portion includes at least one data symbol.

Optionally, the preamble portion and the data portion occupy the same or different bandwidths in the frequency domain; The frequency domain resources occupied by the preamble portion and the data portion at least partially overlap.

Optionally, the spreading code has a one-to-one or many-to-one mapping relationship with the preamble resources corresponding to the preamble portion.

Optionally, the transmitter may further include a sequence generating unit configured to divide the roots of the preamble ZC sequence to which the target cell is allocated into at least two groups, and apply different orthogonal codes to each group root to form a preamble Before the resource, a ZC sequence of a corresponding length is generated according to the number of available subcarriers of the preamble portion in the target cell time-frequency resource, and the ZC sequence has a preset number of roots.

Optionally, the manner in which the preamble portion occupies a subcarrier may include:

The preamble portion is placed consecutively on all subcarriers of the occupied bandwidth; or

The preamble portions are equally spaced across the subcarriers over the occupied bandwidth to form a comb structure.

Optionally, the transmitter may further include a preamble resource generating unit, which is configurable:

其中

为目标小区被分配的前导ZC序列根的个数，

为所述目标小区单根上配置的可用循环移位个数；将所述ZC序列的所有根分组，并对各组根应用不同的正交码，分组个数等于正交码长度；If the preamble portion is continuously placed on all subcarriers of the occupied bandwidth, the size of the preamble resource pool is

among them

The number of leading ZC sequence roots assigned to the target cell,

And the number of available cyclic shifts configured on a single root of the target cell; grouping all roots of the ZC sequence, and applying different orthogonal codes to each group root, the number of packets being equal to the orthogonal code length;

If the preamble portion is equally spaced across the subcarriers and forms a comb structure over the occupied bandwidth, each subcarrier group of the comb structure constitutes an orthogonal preamble time-frequency resource sub-pool, and is grouped according to the following rules. Orthogonal code application:

其中

为梳状结构分出来的子载波组个数；将每个资源子池上的所有根分组，并对每个资源子池上的各组根应用不同的正交码，分组个数等于正交码长度，且每个资源子池所使用的的正交码组相同；In the case that the target cell is configured to apply to all resource sub-pools, the size of the pre-lead resource pool is

among them

The number of subcarrier groups divided for the comb structure; all roots on each resource subpool are grouped, and different orthogonal codes are applied to each group root on each resource subpool, and the number of packets is equal to the orthogonal code length. And the orthogonal code groups used by each resource subpool are the same;

其中

为第i个资源子池中所应用的根个数；将每个资源子池上的所有根分组，并应用不同的正交码，分组个数等于正交码长度，每 个资源子池所使用的的正交码组相同。In the case that the target cell is configured with different roots applied to different resource sub-pools, and at least one resource sub-pool is applied with at least two different roots, and all the roots are used, the size of the leading resource pool is

among them

The number of roots applied to the i-th resource sub-pool; group all roots on each resource sub-pool and apply different orthogonal codes, the number of packets being equal to the orthogonal code length, used by each resource sub-pool The orthogonal code groups are the same.

Optionally, the preamble generating unit 81 may include:

a selection module, configured to select a preamble resource from the pool of preamble resources to generate a preamble sequence of the user equipment;

a transform module, configured to perform an IFFT transform on the selected preamble sequence to form a preamble symbol in the time domain, and repeatedly placing the preamble symbol in the time domain at least twice to form at least two preamble symbols;

And a generating module, configured to apply a corresponding orthogonal code to the at least two preamble symbols to generate a leading portion of the communication signal of the user equipment.

Optionally, the length of the orthogonal coding is less than or equal to the number of repetitions of the preamble symbol, and in a case where the length of the orthogonal coding is less than the repetition number of the preamble symbol, the orthogonal coding is completed at least Partially repeated methods apply to all leading symbols.

Optionally, the autocorrelation coefficient of the preset sequence is greater than a first threshold, and the cross-correlation coefficient of the preset sequence is less than a second threshold.

Optionally, the data generating unit 82 includes: a modulation module configured to modulate transmission data of each user equipment into original data symbols; and an expansion module configured to apply a spreading code to the original data symbol for data expansion to form the The data portion of the communication signal.

Optionally, the application of the spreading code on each original data symbol includes applications only in the time domain, only in the frequency domain or in the time domain and frequency domain.

Optionally, the applying only in the time domain comprises: expanding the original modulation symbol into 1 _code consecutive time domain symbols in the time domain, where l _code is a spreading code length;

The application only in the frequency domain includes: expanding the original modulation symbol into 1 _code consecutive frequency domain symbols in the frequency domain, and l _code is a spreading code length;

个连续时频域符号，

为扩展码长度。The application in the time domain and the frequency domain includes: expanding the original modulation symbol into a time-frequency domain

Continuous time-frequency domain symbols,

For the extension code length.

Correspondingly, as shown in FIG. 9, an embodiment of the present disclosure further provides a receiver, including:

a preamble detecting unit 91 configured to perform preamble detection on a preamble portion of the received communication signal of the user equipment; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes An orthogonal code; the data portion is generated by applying a spreading code on the original data symbol;

The data receiving unit 92 is configured to perform corresponding data reception according to a correspondence between the preamble portion and the data portion.

The receiver provided by the embodiment of the present disclosure adopts a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception in one time, thereby eliminating multiple access message interactions and effectively improving. Communication efficiency. At the same time, since the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment, the data part adopts the spreading code multiple access technology, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment, which greatly Improve the spectrum efficiency of the entire network.

Optionally, the preamble detecting unit 91 may include: an interference cancellation module configured to at least partially cancel interference in the preamble portion according to the orthogonal coding in the preamble portion; a preamble processing module configured to perform the preamble portion At least one of the following operations: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.

Optionally, the correspondence between the preamble portion and the data portion may include: a mapping relationship between a preamble resource of the preamble portion and the spreading code, and the preamble portion occupies a frequency band and the data portion occupies Correspondence between frequency bands.

Optionally, the data receiving unit 92 includes: a channel estimation module, configured to learn, according to a correspondence between the preamble portion occupied frequency band and the data portion occupied frequency band, a channel estimation of the data portion by using a channel estimation for the preamble portion; a spreading code determining module, configured to determine, according to a one-to-one or many-to-one mapping relationship between a spreading code of the data portion and a preamble resource of the preamble portion, by using the preamble resource learned in preamble detection a spreading code of the data portion; the data receiving module is configured to perform corresponding data reception on all the detected user equipments according to the channel estimation of the data portion and the spreading code.

Optionally, the preamble portion and the data portion occupy the same or different bandwidths in a frequency domain; the preamble portion and the frequency domain resources occupied by the data portion at least partially overlap.

Correspondingly, the present disclosure further provides an OFDM communication system, including a transmitter and a receiver; the transmitter is configured to divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, and apply different groups to each group root Or orthogonal code to form a preamble resource pool; wherein the transmitter is further configured to: select a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; Applying a spreading code to the transmission data to generate a data portion of the communication signal of the user equipment to implement concurrent access by the multi-user equipment; combining the preamble portion and the data portion into a frame; the receiver is configured to: receive Preamble detection of the communication signal of the user equipment to the preamble; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion is generated by applying a spreading code on the original data symbol; The preamble detection includes at least one of: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation; and performing corresponding data reception according to a correspondence between the preamble portion and the data portion.

The OFDM communication system provided by the embodiment of the present disclosure adopts a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception at one time, thereby eliminating multiple access message interactions and effectively improving. Communication efficiency. At the same time, because the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment, the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment. Greatly improved the spectrum efficiency of the whole network.

Optionally, the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.

Optionally, the manner in which the preamble portion occupies a subcarrier includes: the preamble portion is continuously placed on all subcarriers of the occupied bandwidth; or the preamble portion is equally spaced across the subcarriers on the occupied bandwidth to form a comb Structure.

Optionally, the selecting, by the transmitter, the corresponding preamble resource from the pool of the preamble resources to generate a preamble portion of the communication signal of the user equipment, including: selecting a preamble resource from the pool of the preamble resources to generate a preamble sequence of the user equipment Performing an IFFT transform on the selected preamble sequence to form a preamble symbol on the time domain, and repeating the preamble symbol at least twice in the time domain to form at least two preamble symbols; applying corresponding to the at least two preamble symbols An orthogonal code to generate a leading portion of the communication signal of the user equipment.

Accordingly, embodiments of the present disclosure also provide a transmitter including a processor for performing data processing, a memory for data storage, and a data transceiver for data transmission and/or reception, the memory being used for storage implementation An instruction for a signal design method for OFDM communication, the processor is configured to execute the memory stored instruction, and divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, each group applying different orthogonalities respectively Code to form a pool of preamble resources, when the processor executes the memory And the step of executing includes: selecting a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; and generating a data portion of the communication signal of the user equipment by applying a spreading code to the transmission data To implement concurrent access by the multi-user device; combining the preamble portion and the data portion into a frame.

The transmitter provided by the embodiment of the present disclosure adopts a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception at one time, thereby eliminating multiple access message interactions and effectively improving. Communication efficiency. At the same time, because the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment, the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment. Greatly improved the spectrum efficiency of the whole network.

Optionally, the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.

Optionally, the manner in which the preamble portion occupies a subcarrier includes: the preamble portion is continuously placed on all subcarriers of the occupied bandwidth; or the preamble portion is equally spaced across the subcarriers on the occupied bandwidth to form a comb Structure.

Optionally, the step of selecting a corresponding preamble resource from the pool of the preamble resources to generate a preamble portion of the communication signal of the user equipment includes: selecting a preamble resource from the pool of the preamble resources to generate a preamble sequence of the user equipment; Selecting a preamble sequence for IFFT transform, forming a preamble symbol in the time domain, and repeating the preamble symbol at least twice in the time domain to form at least two preamble symbols; applying corresponding orthogonality to the at least two preamble symbols a code to generate a leading portion of the communication signal of the user equipment.

Accordingly, embodiments of the present disclosure also provide a receiver including a processor configured to perform data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, the memory being used for Storing instructions implementing a signal design method for OFDM communication, the processor being configured to execute the memory stored instructions, and when the processor executes the memory stored instructions, the performing step comprises: receiving The preamble portion of the communication signal of the user equipment performs preamble detection; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion is generated by applying a spreading code on the original data symbol; Corresponding data is received by the correspondence between the preamble portion and the data portion.

The receiver provided by the embodiment of the present disclosure adopts a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception in one time, thereby eliminating multiple access message interactions and effectively improving. Communication efficiency. At the same time, because the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment, the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment. Greatly improved the spectrum efficiency of the whole network.

Optionally, performing preamble detection on the preamble portion of the received communication signal includes: at least partially eliminating interference in the preamble portion according to the orthogonal code in the preamble portion; performing at least one of the following on the preamble portion Item operations: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.

Optionally, the correspondence between the preamble portion and the data portion includes: a mapping relationship between a preamble resource of the preamble portion and the spreading code, and a preamble portion occupying a frequency band and the data portion occupying a frequency band Correspondence between them.

Optionally, the performing, according to the correspondence between the preamble portion and the data portion, performing corresponding data reception, according to: a correspondence between a frequency band occupied by the preamble portion and a frequency band occupied by the data portion, Obtaining a channel estimate for the data portion of the channel portion of the preamble portion; a one-to-one or many-to-one mapping relationship between the preamble resource of the preamble portion and a spreading code of the data portion, known by the preamble detection The preamble resource determines a spreading code of the data part; and performs corresponding data reception on all detected user equipments according to the channel estimation of the data part and the spreading code.

It is to be understood that the term "comprises", "comprising", or any other variants thereof, is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes those elements. It also includes other elements that are not explicitly listed, or elements that are inherent to such a process, method, article, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is typical. Implementation. Based on such understanding, the technical side of the present disclosure The part of the case that contributes essentially or to the relevant technology can be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, optical disk), including a number of instructions for making A terminal device (which may be a cell phone, a computer, a server, an air conditioner, or a network device, etc.) performs the methods described in various embodiments of the present disclosure.

The above is only an alternative embodiment of the present disclosure, and thus does not limit the scope of the patents of the present disclosure, and the equivalent structure or equivalent process transformations made by the disclosure and the contents of the drawings, or directly or indirectly applied to other related technologies. The scope of the invention is included in the scope of patent protection of the present disclosure.

Industrial applicability

The signal design method and system for OFDM communication provided by the present disclosure, the transmitter and the receiver adopt a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception at one time, and avoid Going to multiple access message interactions effectively improves communication efficiency. At the same time, because the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment, the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment. Greatly improved the spectrum efficiency of the whole network.

Claims (38)

A signal design method for Orthogonal Frequency Division Multiplexing (OFDM) communication includes: The roots of the preamble Zadoff-Chu ZC sequence to which the target cell is allocated are divided into at least two groups, and different orthogonal codes are respectively applied to each group root in the preamble sequence to form a preamble resource pool; Selecting a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; Generating a data portion of the communication signal of the user equipment by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user device; The preamble portion and the data portion are combined into a frame. The method according to claim 1, wherein in the combined frame, the preamble portion and the data portion are successively placed in a time domain, or the preamble portion and the data portion are respectively divided into a plurality of segments And a plurality of segments of the leading portion and a plurality of segments of the data portion are interleaved with each other. The method according to claim 1, wherein the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation. The method of claim 1, wherein the preamble portion and the data portion occupy the same or different bandwidths in a frequency domain; the frequency domain resources occupied by the preamble portion and the data portion overlap or partially overlap each other. The method according to claim 1, wherein the preamble resource corresponding to the preamble portion has a one-to-one or many-to-one mapping relationship with the spreading code. The method of claim 1, wherein the manner in which the preamble portion occupies a subcarrier comprises: The preamble portion is placed consecutively on all subcarriers of the occupied bandwidth; or The preamble portions are equally spaced across the subcarriers over the occupied bandwidth to form a comb structure. The method according to claim 6, wherein the root of the preamble ZC sequence to which the target cell is allocated is divided into at least two groups, and different orthogonal codes are respectively applied to each group root in the preamble ZC sequence to form The leading resource pool includes: Determining the size of the preamble resource pool as responsive to the preamble portion being placed consecutively on all subcarriers of the occupied bandwidth

among them

The number of leading ZC sequence roots assigned to the target cell,

And the number of available cyclic shifts configured on the single root of the target cell; grouping the roots of the ZC sequence, and applying different orthogonal codes to each group of the ZC sequence, the number of packets being equal to the orthogonal code length ; Responding to the preamble portion being equally spaced across the subcarriers and occupying a comb structure over the occupied bandwidth, each subcarrier group of the comb structure is determined as an orthogonal preamble time-frequency resource sub-pool, and is as follows The rules apply the packet and orthogonal code to the root of the leading ZC sequence: Responding to the target cell being configured to apply the root of the preamble ZC sequence to all resource subpools of the comb structure, determining the size of the preamble resource pool as

among them

The number of subcarrier groups divided for the comb structure; the roots on each resource subpool are grouped, and different orthogonal codes are applied to each group root of each resource subpool, and the number of packets is equal to the orthogonal code length. And the orthogonal code groups used by all resource subpools are the same; In response to the target cell being configured to apply different roots of the preamble ZC sequence to different resource subpools, at least one different root is applied to at least one resource subpool, and roots of the leading ZC sequence are used The size of the preamble resource pool is determined to be

among them

The number of roots applied in the i-th resource sub-pool; group the roots on each resource sub-pool, and apply different orthogonal codes to each group root of each resource sub-pool, the number of packets is equal to the orthogonal code The length, the orthogonal code group used by each resource subpool is the same. The method according to any one of claims 1 to 7, wherein selecting a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment comprises: And selecting a preamble resource from the pool of the preamble resources to generate a preamble sequence of the user equipment; Performing an IFFT transform on the selected preamble sequence to form a preamble symbol on the time domain, and repeating the preamble symbol at least twice in the time domain to form at least two preamble symbols; A corresponding orthogonal code is applied to the at least two preamble symbols to generate a preamble portion of the communication signal of the user equipment. The method according to any one of claims 1 to 7, wherein said transmitting data by pair Generating a data portion of the communication signal of the user equipment by using a spreading code includes: Modulating transmission data of the user equipment into original data symbols; The spreading code is applied to the original data symbols for data expansion to form a data portion of the communication signal. The method of claim 9, wherein the application of the spreading code on each of the original data symbols comprises an application only in the time domain, an application only in the frequency domain, or in the time domain and the frequency domain. application. The method according to claim 10, wherein the application only in the time domain comprises: expanding the original data symbols into l _code consecutive time domain symbols in the time domain, wherein l _code is a spreading code length; The application only in the frequency domain includes: expanding the original data symbol into 1 _code consecutive frequency domain symbols in the frequency domain, and l _code is a spreading code length; The application in the time domain and the frequency domain includes: expanding the original data symbol into a time-frequency domain

Continuous time-frequency domain symbols,

For the extension code length. A signal design method for Orthogonal Frequency Division Multiplexing (OFDM) communication includes: Performing preamble detection on a leading portion of the received communication signal of the user equipment; wherein the communication signal includes the preamble portion and the data portion; the preamble portion includes an orthogonal code; and the data portion passes over the original data symbol Application extension code generation; Corresponding data reception is performed according to the correspondence between the preamble portion and the data portion. The method of claim 12 wherein said performing preamble detection on a leading portion of the received communication signal comprises: Interfering with interference in the preamble portion based at least in part on the orthogonal code in the preamble portion; Performing at least one of the following operations on the preamble portion: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation. The method according to claim 12, wherein the correspondence between the preamble portion and the data portion comprises: a mapping relationship between a preamble resource of the preamble portion and the spreading code, and a preamble portion occupying a frequency band And the data portion occupies a correspondence relationship between the frequency bands. The method according to claim 14, wherein the performing data reception according to the correspondence between the preamble portion and the data portion comprises: Obtaining a channel estimate of the data portion from a channel estimate of the preamble portion according to a correspondence between the preamble portion occupied frequency band and the data portion occupied frequency band; Determining, according to a one-to-one or many-to-one mapping relationship between a preamble resource of the preamble portion and a spreading code of the data portion, a preamble resource learned from preamble detection to determine a spreading code of the data portion; And corresponding data reception is performed on the detected user equipment according to the channel estimation of the data part and the spreading code. a transmitter configured to divide a root of a leading Zadoff-Chu ZC sequence to which a target cell is allocated into at least two groups, and apply different orthogonal codes to each group root of the leading ZC sequence to form a leading resource pool. The transmitter includes: a preamble generating unit, configured to select a preamble resource from the preamble resource pool to generate a leading part of a communication signal of the user equipment; a data generating unit, configured to generate a data part of the communication signal of the user equipment by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user equipment; a framing unit for combining the preamble portion and the data portion into a frame. The transmitter according to claim 16, wherein, in the combined frame, the preamble portion and the data portion are successively placed in a time domain, or the preamble portion and the data portion are respectively divided into a plurality of sections a segment, and the plurality of segments of the leading portion and the plurality of segments of the data portion are interleaved with each other. The transmitter according to claim 16, wherein the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation. The transmitter of claim 16, further comprising a preamble resource generating unit configured to: If the preamble portion is continuously placed on all subcarriers of the occupied bandwidth, the size of the preamble resource pool is determined as

among them

The number of leading ZC sequence roots assigned to the target cell,

And the number of available cyclic shifts configured on the single root of the target cell; grouping the roots of the ZC sequence, and applying different orthogonal codes to each group of the ZC sequence, the number of packets being equal to the orthogonal code length ; If the preamble portion is equally spaced across the subcarriers and forms a comb structure over the occupied bandwidth, each subcarrier group of the comb structure is determined to be an orthogonal preamble time-frequency resource sub-pool, according to the following rules Perform grouping and orthogonal code applications: Where the target cell is configured to apply the root of the preamble ZC sequence to all resource sub-pools of the comb structure, the size of the preamble resource pool is determined as

among them

The number of subcarrier groups divided for the comb structure; the roots on each resource subpool are grouped, and different orthogonal codes are applied to each group root of each resource subpool, and the number of packets is equal to the orthogonal code length. And the orthogonal code groups used by all resource subpools are the same; The target cell is configured to apply different roots of the preamble ZC sequence to different resource subpools, at least one different root is applied to at least one resource subpool, and roots of the preamble ZC sequence are used. In the case, the size of the preamble resource pool is determined to be

among them

Is the number of roots applied in the i-th resource sub-pool; group the roots on each resource sub-pool, and apply different orthogonal codes to each group root on each resource sub-pool, the number of packets is equal to the orthogonal code The length, the orthogonal code group used by each resource subpool is the same. The transmitter according to any one of claims 16 to 19, wherein the preamble generating unit comprises: a selection module, configured to select a preamble resource from the pool of preamble resources to generate a preamble sequence of the user equipment; a transform module, configured to perform an IFFT transform on the selected preamble sequence to form a preamble symbol in a time domain, and repeatedly placing the preamble symbol at least twice in a time domain to form at least two preamble symbols; And a generating module, configured to apply a corresponding orthogonal code to the at least two preamble symbols to generate a leading portion of the communication signal of the user equipment. The transmitter according to any one of claims 16 to 19, wherein the data generating unit comprises: a modulation module configured to modulate transmission data of the user equipment into original data symbols; An extension module configured to apply a spreading code to the original data symbol for data expansion to form a The data portion of the communication signal. A receiver comprising: a preamble detecting unit configured to perform preamble detection on a preamble portion of the received communication signal of the user equipment; wherein the communication signal includes the preamble portion and the data portion; the preamble portion includes an orthogonal code; the data portion Generated by applying a spreading code to the original data symbol; The data receiving unit is configured to perform corresponding data reception according to a correspondence between the preamble portion and the data portion. The receiver according to claim 22, wherein said preamble detecting unit comprises: An interference cancellation module configured to at least partially cancel interference in the preamble portion according to the orthogonal code in the preamble portion; The preamble processing module is configured to perform at least one of the following operations on the preamble portion: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation. The receiver according to claim 22, wherein the correspondence between the preamble portion and the data portion comprises: a mapping relationship between a preamble resource of the preamble portion and the spreading code, and the preamble portion occupies The frequency band and the data portion occupy the correspondence between the frequency bands. The receiver according to claim 24, wherein said data receiving unit comprises: a channel obtaining module, configured to obtain, according to a correspondence between a frequency band occupied by the preamble portion and a frequency band occupied by the data portion, and obtain a channel estimation of the data portion by using a channel estimation of the preamble portion; a spreading code determining module, configured to determine, according to a one-to-one or many-to-one mapping relationship between a preamble resource of the preamble portion and a spreading code of the data portion, by the preamble resource learned in preamble detection The spreading code of the data part; The data receiving module is configured to perform corresponding data reception on the detected user equipment according to the channel estimation of the data portion and the spreading code. An Orthogonal Frequency Division Multiplexing (OFDM) communication system comprising a transmitter and a receiver; wherein the transmitter is configured to divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, in the preamble sequence Each group root applies different orthogonal codes to form a preamble resource pool; The transmitter is also configured to: Selecting a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; Generating a data portion of the communication signal of the user equipment by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user device; Combining the preamble portion and the data portion into a frame; The receiver is configured to: Performing preamble detection on a leading portion of the received communication signal of the user equipment; wherein the communication signal includes the preamble portion and the data portion; the preamble portion includes an orthogonal code; and the data portion passes over the original data symbol Application extension code generation; Corresponding data reception is performed according to the correspondence between the preamble portion and the data portion. The system of claim 26, wherein the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation. The system of claim 26, wherein the manner in which the preamble portion occupies a subcarrier comprises: The preamble portion is placed consecutively on all subcarriers of the occupied bandwidth; or The preamble portions are equally spaced across the subcarriers over the occupied bandwidth to form a comb structure. The system of any one of claims 26 to 28, wherein the transmitter is configured to generate a leading portion of a communication signal of the user equipment from the pool of preamble resources by selecting a corresponding preamble resource in the following manner: And selecting a preamble resource from the pool of the preamble resources to generate a preamble sequence of the user equipment; Performing an IFFT transform on the selected preamble sequence to form a preamble symbol on the time domain, and repeating the preamble symbol at least twice in the time domain to form at least two preamble symbols; A corresponding orthogonal code is applied to the at least two preamble symbols to generate a preamble portion of the communication signal of the user equipment. A transmitter includes a processor for performing data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, wherein the memory is configured to be implemented by a memory An instruction for a signal design method for OFDM communication, the processor being configured to execute the memory stored instructions to divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, and to the preamble ZC sequence Each group root applies a different orthogonal code to form a pool of preamble resources. When the processor executes the instruction stored in the memory, the steps performed include: Selecting a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; Generating a data portion of the communication signal of the user equipment by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user device; The preamble portion and the data portion are combined into a frame. The transmitter according to claim 30, wherein the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation. The transmitter of claim 31, wherein the manner in which the preamble portion occupies a subcarrier comprises: The preamble portion is placed consecutively on all subcarriers of the occupied bandwidth; or The preamble portion is equally spaced across the subcarriers over the occupied bandwidth and forms a comb structure. The transmitter according to any one of claims 30 to 32, wherein the preamble portion for selecting a corresponding preamble resource from the pool of preamble resources to generate a communication signal of the user equipment comprises: And selecting a preamble resource from the pool of the preamble resources to generate a preamble sequence of the user equipment; Performing an IFFT transform on the selected preamble sequence to form a preamble symbol on the time domain, and repeating the preamble symbol at least twice in the time domain to form at least two preamble symbols; A corresponding orthogonal code is applied to the at least two preamble symbols to generate a preamble portion of the communication signal of the user equipment. A receiver comprising a processor for performing data processing, a memory configured for data storage, and a data transceiver configured to transmit and/or receive data, wherein the memory is configured to store a signal design method implemented for OFDM communication And the processor is configured to execute the memory stored instructions, and when the processor executes the memory stored instructions, the performing step comprises: Performing preamble detection on a preamble portion of the received communication signal of the user equipment; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion applies an extension on the original data symbol Code generation Corresponding data reception is performed according to the correspondence between the preamble portion and the data portion. The receiver of claim 34, wherein said performing preamble detection on a leading portion of the received communication signal comprises: Interfering with interference in the preamble portion based at least in part on the orthogonal code in the preamble portion; Performing at least one of the following operations on the preamble portion: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation. The receiver according to claim 34, wherein the correspondence between the preamble portion and the data portion includes: a mapping relationship between a preamble resource of the preamble portion and the spreading code, and the preamble portion occupies The frequency band and the data portion occupy the correspondence between the frequency bands. The receiver according to claim 36, wherein said performing data reception according to a correspondence between said preamble portion and said data portion comprises: Obtaining a channel estimate of the data portion from a channel estimate of the preamble portion according to a correspondence between the preamble portion occupied frequency band and the data portion occupied frequency band; Determining, according to a one-to-one or many-to-one mapping relationship between a preamble resource of the preamble portion and a spreading code of the data portion, a preamble resource learned from preamble detection to determine a spreading code of the data portion; And corresponding data reception is performed on the detected user equipment according to the channel estimation of the data part and the spreading code. A computer readable storage medium storing computer executable instructions, the computer executable instructions being configured to perform the method of any of claims 1-15.

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