CN113055122B - 5G broadcast communication method and system based on time domain interleaving - Google Patents

Abstract

The invention provides a 5G broadcast communication method and a system based on time domain interleaving, which comprises the following steps: sequentially carrying out a bit coding step and a modulation step on a bit sequence to be sent to obtain a symbol-level data stream, carrying out a time domain interleaving step to obtain a data matrix, sequentially carrying out a pilot frequency insertion step, an inverse fast Fourier transform step and a cyclic prefix insertion step on the data matrix to obtain frame data, and transmitting each frame data to a receiving step through a channel; and sequentially carrying out a cyclic prefix removing step, a Fourier transform step, a channel estimation and equalization step on each frame of data transmitted through a channel to obtain a data stream of a symbol level, carrying out a time domain de-interleaving step to obtain symbol data in sequence before the interleaving step, and sequentially carrying out a demodulation step and a bit decoding step to obtain bit data received by a receiving end to finish 5G broadcast communication. The invention resists larger multipath time delay expansion, supports the application scene of multimedia broadcast multicast and improves the fault tolerance performance of the system.

Description

5G broadcast communication method and system based on time domain interleaving

technical field

The present invention relates to the technical field of wireless communication, and in particular, to a 5G broadcast communication method and system based on time domain interleaving. More specifically, it relates to a communication method with time-domain interleaving function suitable for rooftop and car-mounted receiving modes of 5G broadcasting systems.

Background technique

With the coming of the 5G era, high-speed mobile communication networks can carry and disseminate richer multimedia resources, which will definitely have a huge impact on the radio and television industry. The emergence of 5G will bring challenges to the traditional digital terrestrial broadcasting technology, but also bring new opportunities for the mobile reception of radio and television. 5G will support services such as mobile video, ultra-high definition, augmented reality, and virtual reality. However, in the face of the rapid growth of multimedia services for large-scale users, the explosive traffic consumption will greatly affect the quality of service for users to access mobile communication networks. In this context, eMBMS (Evolved Multimedia Broadcast Multicast Services, Enhanced Broadcast and Multicast) based on LTE (Long Term Evolution), and its evolution version EnTV (Enhancement for TV Service) in Rel-14, Provides ideas for resolving this contradiction.

In broadcast communication, the characteristic of wireless channel itself makes its channel condition very complicated and bad. For example, the existence of pedestrians, vehicles and buildings will cause reflection and diffraction of the signal, which makes the final received signal actually a superimposed signal of the same signal passing through different paths, and the delay of the sub-signals in each path and phase are different, so the final synthesized total signal tends to fluctuate violently, a phenomenon called multipath fading. This kind of signal fading caused by bad channels often causes continuous burst errors in the data in the receiver. The existing demodulation and error correction technologies are relatively easy to resist scattered random errors, but it is difficult to correct a continuous period of error. Burst errors. Therefore, in order to convert such continuous burst errors into scattered random errors as much as possible and improve the fault-tolerant performance of the system, the system needs time-domain interleaving technology.

The main function of time-domain interleaving is to convert long continuous deep fadings that appear in the time domain into short-lasting fadings that appear approximately randomly, and these shorter fadings that appear approximately randomly can be corrected by the system. method, time-domain interleaving can help the system to give full play to its error correction capability in each time period, and improve the overall fault-tolerant performance of the system. The implementation principle of interleaving is to disperse the continuous deep fading generated in the channel into an approximate random pattern as much as possible for the channel where the system is located, while facilitating the implementation of hardware and reducing the complexity and overhead of the device.

Patent document CN101582739A (application number: 200810126458.6) discloses a device for transmitting digital broadcast signals, comprising: at least one first encoding unit, each first encoding unit is used to perform forward error correction encoding on data in a subchannel At least one time-domain interleaving unit, each time-domain interleaving unit receives data output by a first coding unit, and performs time-domain interleaving on the encoded data; the first multiplexing unit is used for the output of each time-domain interleaving unit. The interleaved data is multiplexed into MSC data; the second coding unit is used to perform forward error correction coding on the second group of data to obtain FIC data; the differential modulation unit is used to differentially modulate the FIC data using the first modulation mode , using the second modulation mode to differentially modulate the MSC data; wherein, the modulation level of the first modulation mode is lower than the modulation level of the second modulation mode; and the frame generation and transmission unit, using the differential modulation symbol sequence generated by the differential modulation unit to generate a signal unit transmission frame and transmit the signal unit transmission frame.

SUMMARY OF THE INVENTION

In view of the defects in the prior art, the purpose of the present invention is to provide a 5G broadcast communication method and system based on time domain interleaving.

A 5G broadcast communication method based on time domain interleaving provided according to the present invention includes: a sending step and a receiving step;

The sending step includes: sequentially passing the bit sequence to be sent through the bit coding step and the modulation step to obtain a symbol-level data stream, subjecting the symbol-level data stream to a time-domain interleaving step to obtain a data matrix, and sequentially passing the data matrix through the pilot frequency The frame data is obtained after the inserting step, the inverse fast Fourier transform step and the inserting cyclic prefix step, and each frame of data is transmitted through the channel to the receiving step;

The receiving step includes: passing each frame of data transmitted through the channel in the sending step through the cyclic prefix removal step, the Fourier transform step, and the channel estimation and equalization steps to obtain a symbol-level data stream, and passing the obtained symbol-level data through the steps. The time-domain deinterleaving step obtains the symbol data in the sequence before the interleaving step, and the obtained symbol-level data is sequentially subjected to the demodulation step and the bit decoding step to obtain the bit data received by the receiving end, and the 5G broadcast communication is completed.

Preferably, the time-domain interleaving step includes: after the modulation step, a symbol-level data stream is obtained, and the data expression of one OFDM symbol is: a _k =[ _ak (1), _ak (2),... , a _k (L)] ^T (1); wherein, L represents the length of the data in one frame, k represents the user k, [] ^T represents the transpose operation;

其中

为第i个OFDM符号的第j个数据；将N个OFDM符号的数据形成发射过程后的数据矩阵A_k顺次排列为:The number of 5G broadcasting system transmission subframes is M, and the number of OFDM symbols in each subframe is N, forming the data matrix after the transmission process

in

is the j-th data of the i-th OFDM symbol; the data of the N OFDM symbols is formed into the data matrix A _k after the transmission process and is arranged in sequence as:

共计N×L个数据符号；将数据P按行顺次写入交织器中，并按列顺次读出，交织器为m×n大小的矩阵存储器，其中m代表交织器矩阵存储器的行数，n代表交织器矩阵存储器的列数；

A total of N×L data symbols; the data P is written into the interleaver in row order, and read out in column order, the interleaver is a matrix memory of m×n size, where m represents the number of rows of the interleaver matrix memory , n represents the number of columns of the interleaver matrix memory;

When the data symbol N×L is larger than the size of the interleaver m×n, the extra data symbols do not participate in the interleaving, that is, the first m×n data symbols are written into the interleaver; when the data symbol N×L is less than or equal to the interleaver m× n size, then the data symbols N×L all participate in the interleaving; the data symbols after passing through the interleaver are:

Rearranging the interleaved data symbols into a data matrix to be sent is:

The obtained data matrix B _K and the data of the excess part not participating in the interleaving are output to the pilot insertion step.

Preferably, the time-domain deinterleaving step includes: deinterleaving the data stream at the symbol level after the channel estimation and equalization steps and deinterleaving the channel parameters estimated by pilot insertion;

After the channel estimation and equalization steps, the symbol-level data stream deinterleaving is obtained: after channel estimation and equalization, the symbol-level data stream expression is:

The symbol-level data streams C _k obtained after the channel estimation and equalization steps are sequentially arranged as:

共计N×L个数据符号；将数据Q按列顺次写入解交织器中，并按行顺次读出，解交织器为m×n大小的矩阵存储器；其中m代表交织器矩阵存储器的行数，n代表交织器矩阵存储器的列数；解交织器行数m与列数n的大小与交织器的大小相同；

A total of N×L data symbols; the data Q is written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size; where m represents the value of the matrix memory of the interleaver. The number of rows, n represents the number of columns of the interleaver matrix memory; the size of the deinterleaver row number m and the column number n is the same as the size of the interleaver;

When the N×L of the data symbols is greater than the m×n size of the deinterleaver, the excess data symbols do not participate in the deinterleaving, that is, the first m×n data symbols are written into the deinterleaver; when the data symbols N×L are smaller than the deinterleaver equal to the size of the deinterleaver m×n, then all the data symbols N×L participate in the interleaving;

The data symbols after deinterleaver are:

Rearrange the deinterleaved data symbols as

Deinterleaving of channel parameters estimated by pilot insertion: The channel parameters estimated by pilot insertion are:

共计N×L个信道参数；将重新排列后的信道参数J按列顺次写入解交织器中，并按行顺次读出，解交织器为m×n大小的矩阵存储器；The channel parameters H _k are arranged in sequence as:

A total of N×L channel parameters; the rearranged channel parameters J are written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size;

When the number of channel parameters N×L is greater than the size m×n of the deinterleaver, the excess channel parameters do not participate in the deinterleaving, that is, only the first m×n channel parameters are written into the deinterleaver; The number of N×L is less than or equal to the size of the deinterleaver m×n, then the number of channel parameters N×L all participate in the interleaving;

The channel parameters after deinterleaver are listed as:

Rearrange the deinterleaved channel parameters as

The rearranged de-interleaved data proves D _k , R _k and the data and channel parameters of the excess part not participating in the de-interleaving and output to the demodulation step.

其中，T_max表示最大码块的长度，B_max表示校验比特的长度，p表示调制阶数；Preferably, the expression of the number of columns n is:

Among them, _Tmax represents the length of the largest code block, _Bmax represents the length of the parity bit, and p represents the modulation order;

其中，

表示取整运算，其中N×L是数据符号的个数，n是交织器列数的大小。The expression of the number of lines m is:

in,

Represents a rounding operation, where N×L is the number of data symbols, and n is the size of the number of interleaver columns.

Preferably, the symbol-level data stream obtained after the modulation step includes:

A 5G broadcast system transmits a frame containing a preset number of subframes. Each subframe has a preset time domain value. Each frame is divided into two equal-sized half-frames. One set of half-frames on one carrier is used for uplink, and the other The group field is used for downlink, supports multiple OFDM waveform parameters, and the sub-carrier spacing of the subframe satisfies Δf=2 ^μ ·15 [kHz]; where μ represents the parameter value.

The present invention provides a 5G broadcast communication system based on time domain interleaving, comprising: a sending module and a receiving module;

The sending module includes: passing the bit sequence to be sent through a bit coding module and a modulation module in sequence to obtain a symbol-level data stream, passing the symbol-level data stream through a time-domain interleaving module to obtain a data matrix, and sequentially passing the data matrix through a pilot frequency The frame data is obtained after inserting the module, the inverse fast Fourier transform module and the cyclic prefix module, and each frame data is transmitted to the receiving module through the channel;

The receiving module includes: passing each frame of data transmitted by the sending module through the channel sequentially through the cyclic prefix removal module, the Fourier transform module and the channel estimation and equalization module to obtain a symbol-level data stream, and passing the obtained symbol-level data through the The time-domain deinterleaving module obtains the symbol data in the sequence before the interleaving module, and passes the obtained symbol-level data through the demodulation module and the bit decoding module in turn to obtain the bit data received by the receiver, and completes 5G broadcast communication.

Preferably, the time-domain interleaving module includes: obtaining a symbol-level data stream after the modulation module, and the data expression of one OFDM symbol is: a _k =[ _ak (1), _ak (2),... , a _k (L)] ^T (1); wherein, L represents the length of the data in one frame, k represents the user k, [] ^T represents the transpose operation;

其中

为第i个OFDM符号的第j个数据；将N个OFDM符号的数据形成发射过程后的数据矩阵A_k顺次排列为:The number of 5G broadcasting system transmission subframes is M, and the number of OFDM symbols in each subframe is N, forming the data matrix after the transmission process

in

is the j-th data of the i-th OFDM symbol; the data of the N OFDM symbols is formed into the data matrix A _k after the transmission process and is arranged in sequence as:

共计N×L个数据符号；将数据P按行顺次写入交织器中，并按列顺次读出，交织器为m×n大小的矩阵存储器，其中m代表交织器矩阵存储器的行数，n代表交织器矩阵存储器的列数；

A total of N×L data symbols; the data P is written into the interleaver in row order, and read out in column order, the interleaver is a matrix memory of m×n size, where m represents the number of rows of the interleaver matrix memory , n represents the number of columns of the interleaver matrix memory;

When the data symbol N×L is larger than the size of the interleaver m×n, the extra data symbols do not participate in the interleaving, that is, the first m×n data symbols are written into the interleaver; when the data symbol N×L is less than or equal to the interleaver m× n size, then the data symbols N×L all participate in the interleaving; the data symbols after passing through the interleaver are:

Rearranging the interleaved data symbols into a data matrix to be sent is:

The obtained data matrix B _K and the data of the excess part not participating in the interleaving are output to the pilot insertion module.

Preferably, the time-domain deinterleaving module includes: deinterleaving the channel parameters estimated by the channel estimation and equalization module through symbol-level data stream deinterleaving and pilot insertion;

After the channel estimation and equalization module, the symbol-level data stream deinterleaving is obtained: after channel estimation and equalization, the symbol-level data stream expression is:

The symbol-level data streams C _k obtained after the channel estimation and equalization modules are sequentially arranged as:

共计N×L个数据符号；将数据Q按列顺次写入解交织器中，并按行顺次读出，解交织器为m×n大小的矩阵存储器；其中m代表交织器矩阵存储器的行数，n代表交织器矩阵存储器的列数；解交织器行数m与列数n的大小与交织器的大小相同；

A total of N×L data symbols; the data Q is written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size; where m represents the value of the matrix memory of the interleaver. The number of rows, n represents the number of columns of the interleaver matrix memory; the size of the deinterleaver row number m and the column number n is the same as the size of the interleaver;

When the N×L of the data symbols is greater than the m×n size of the deinterleaver, the excess data symbols do not participate in the deinterleaving, that is, the first m×n data symbols are written into the deinterleaver; when the data symbols N×L are smaller than the deinterleaver equal to the size of the deinterleaver m×n, then all the data symbols N×L participate in the interleaving;

The data symbols after deinterleaver are:

Rearrange the deinterleaved data symbols as

Deinterleaving of channel parameters estimated by pilot insertion: The channel parameters estimated by pilot insertion are:

共计N×L个信道参数；将重新排列后的信道参数J按列顺次写入解交织器中，并按行顺次读出，解交织器为m×n大小的矩阵存储器；The channel parameters H _k are arranged in sequence as:

A total of N×L channel parameters; the rearranged channel parameters J are written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size;

When the number of channel parameters N×L is greater than the size m×n of the deinterleaver, the excess channel parameters do not participate in the deinterleaving, that is, only the first m×n channel parameters are written into the deinterleaver; The number of N×L is less than or equal to the size of the deinterleaver m×n, then the number of channel parameters N×L all participate in the interleaving;

The channel parameters after deinterleaver are listed as:

Rearrange the deinterleaved channel parameters as

The rearranged de-interleaved data proves D _k , R _k and the data and channel parameters of the excess part that did not participate in the de-interleaving and output to the demodulation module.

其中，T_max表示最大码块的长度，B_max表示校验比特的长度，p表示调制阶数；Preferably, the expression of the number of columns n is:

Among them, _Tmax represents the length of the largest code block, _Bmax represents the length of the parity bit, and p represents the modulation order;

其中，

表示取整运算，其中N×L是数据符号的个数，n是交织器列数的大小。The expression of the number of lines m is:

in,

Represents a rounding operation, where N×L is the number of data symbols, and n is the size of the number of interleaver columns.

Preferably, the symbol-level data stream obtained after the modulation module includes:

A 5G broadcast system transmits a frame containing a preset number of subframes. Each subframe has a preset time domain value. Each frame is divided into two equal-sized half-frames. One set of half-frames on one carrier is used for uplink, and the other The group field is used for downlink, supports multiple OFDM waveform parameters, and the sub-carrier spacing of the subframe satisfies Δf=2 ^μ ·15 [kHz]; where μ represents the parameter value.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention adopts the technical solution of the present invention, which is designed for stable reception of car-mounted and rooftop under LPLT, MPMT and HPHT modes of 5G broadcast communication system;

2. The present invention can also support a channel model with larger multipath delay;

3. The present invention can resist large multi-path delay expansion, can support the application scenario of Multimedia Broadcast Multicast (MBMS), and improve the fault tolerance performance of the whole system.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Figure 1 is a working principle diagram of the communication mode of the 5G broadcasting system;

Fig. 2 is the schematic diagram of the interleaving process in the transmission process of the embodiment;

FIG. 3 is a schematic diagram of a deinterleaving process in a receiving process according to an embodiment.

Detailed ways

The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.

The purpose of the present invention is to provide a communication mode with time-domain interleaving function. The present invention provides a communication mode with time-domain interleaving function suitable for rooftop and car-mounted receiving modes of 5G broadcasting system, which is used to meet the channel model that needs to support larger multipath delay and support LPLT, Stable reception requirements in MPMT and HPHT scenarios, while improving the fault tolerance of the system.

A 5G broadcast communication method based on time domain interleaving provided by the present invention includes: a sending step and a receiving step;

The sending step includes: sequentially passing the bit sequence to be sent through the bit coding step and the modulation step to obtain a symbol-level data stream, subjecting the symbol-level data stream to a time-domain interleaving step to obtain a data matrix, and sequentially passing the data matrix through the pilot frequency The frame data is obtained after the inserting step, the inverse fast Fourier transform step and the inserting cyclic prefix step, and each frame of data is transmitted through the channel to the receiving step;

A series of bit-level data streams are obtained after bit coding, and symbol-level data streams are obtained after modulation, and a time interleaving step is inserted between the modulation and pilot insertion steps, that is, the time interleaving operation is performed on the modulated symbols.

Specifically, the time-domain interleaving step includes: after the modulation step, a symbol-level data stream is obtained, and the data expression of one OFDM symbol is: a _k =[ _ak (1), _ak (2),... , a _k (L)] ^T (1); wherein, L represents the length of the data in one frame, k represents the user k, [] ^T represents the transpose operation;

其中

为第i个OFDM符号的第j个数据；将N个OFDM符号的数据形成发射过程后的数据矩阵A_k顺次排列为:The number of 5G broadcasting system transmission subframes is M, and the number of OFDM symbols in each subframe is N, forming the data matrix after the transmission process

in

is the j-th data of the i-th OFDM symbol; the data of the N OFDM symbols is formed into the data matrix A _k after the transmission process and is arranged in sequence as:

共计N×L个数据符号；将数据P按行顺次写入交织器中，并按列顺次读出，交织器为m×n大小的矩阵存储器，其中m代表交织器矩阵存储器的行数，n代表交织器矩阵存储器的列数；

A total of N×L data symbols; the data P is written into the interleaver in row order, and read out in column order, the interleaver is a matrix memory of m×n size, where m represents the number of rows of the interleaver matrix memory , n represents the number of columns of the interleaver matrix memory;

When the data symbol N×L is larger than the size of the interleaver m×n, the extra data symbols do not participate in the interleaving, that is, the first m×n data symbols are written into the interleaver; when the data symbol N×L is less than or equal to the interleaver m× n size, then the data symbols N×L all participate in the interleaving; the data symbols after passing through the interleaver are:

Rearranging the interleaved data symbols into a data matrix to be sent is:

The obtained data matrix B _K and the data of the excess part not participating in the interleaving are output to the pilot insertion step.

其中，6144表示最大码块的长度，24表示校验比特的长度，p表示调制阶数；Specifically, the expression of the number of columns n is:

Among them, 6144 represents the length of the largest code block, 24 represents the length of the check bit, and p represents the modulation order;

其中，

表示取整运算，其中N×L是数据符号的个数，n是交织器列数的大小。The expression of the number of lines m is:

in,

Represents a rounding operation, where N×L is the number of data symbols, and n is the size of the number of interleaver columns.

Specifically, the obtained symbol-level data stream after the modulation step includes:

A 5G broadcast system transmits a frame containing 10 subframes, each subframe has a time domain of 1ms, and each frame is divided into two equal-sized half-frames. For the downlink, a variety of OFDM waveform parameters are supported, and the subcarrier spacing of the subframe satisfies Δf=2 ^μ ·15 [kHz]; where μ represents the parameter value.

The receiving step includes: passing each frame of data transmitted through the channel in the sending step through the cyclic prefix removal step, the Fourier transform step, and the channel estimation and equalization steps to obtain a symbol-level data stream, and passing the obtained symbol-level data through the steps. The time-domain deinterleaving step obtains the symbol data in the sequence before the interleaving step, and the obtained symbol-level data is sequentially subjected to the demodulation step and the bit decoding step to obtain the bit data received by the receiving end, and the 5G broadcast communication is completed.

Specifically, the time-domain deinterleaving step includes: symbol-level data stream deinterleaving after the channel estimation and equalization steps and channel parameter deinterleaving estimated by pilot insertion;

After the channel estimation and equalization steps, the symbol-level data stream deinterleaving is obtained: after channel estimation and equalization, the symbol-level data stream expression is:

The symbol-level data streams C _k obtained after the channel estimation and equalization steps are sequentially arranged as:

共计N×L个数据符号；将数据Q按列顺次写入解交织器中，并按行顺次读出，解交织器为m×n大小的矩阵存储器；其中m代表交织器矩阵存储器的行数，n代表交织器矩阵存储器的列数；解交织器行数m与列数n的大小与交织器的大小相同；

A total of N×L data symbols; the data Q is written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size; where m represents the value of the matrix memory of the interleaver. The number of rows, n represents the number of columns of the interleaver matrix memory; the size of the deinterleaver row number m and the column number n is the same as the size of the interleaver;

When the N×L of the data symbols is greater than the m×n size of the deinterleaver, the excess data symbols do not participate in the deinterleaving, that is, the first m×n data symbols are written into the deinterleaver; when the data symbols N×L are smaller than the deinterleaver equal to the size of the deinterleaver m×n, then all the data symbols N×L participate in the interleaving;

The data symbols after deinterleaver are:

Rearrange the deinterleaved data symbols as

Deinterleaving of channel parameters estimated by pilot insertion: The channel parameters estimated by pilot insertion are:

共计N×L个信道参数；将重新排列后的信道参数J按列顺次写入解交织器中，并按行顺次读出，解交织器为m×n大小的矩阵存储器；The channel parameters H _k are arranged in sequence as:

A total of N×L channel parameters; the rearranged channel parameters J are written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size;

When the number of channel parameters N×L is greater than the size m×n of the deinterleaver, the excess channel parameters do not participate in the deinterleaving, that is, only the first m×n channel parameters are written into the deinterleaver; The number of N×L is less than or equal to the size of the deinterleaver m×n, then the number of channel parameters N×L all participate in the interleaving;

The channel parameters after deinterleaver are listed as:

Rearrange the deinterleaved channel parameters as

The rearranged de-interleaved data proves D _k , R _k and the data and channel parameters of the excess part not participating in the de-interleaving and output to the demodulation step.

The present invention provides a 5G broadcast communication system based on time domain interleaving, comprising: a sending module and a receiving module;

The sending module includes: passing the bit sequence to be sent through a bit coding module and a modulation module in sequence to obtain a symbol-level data stream, passing the symbol-level data stream through a time-domain interleaving module to obtain a data matrix, and sequentially passing the data matrix through a pilot frequency The frame data is obtained after inserting the module, the inverse fast Fourier transform module and the cyclic prefix module, and each frame data is transmitted to the receiving module through the channel;

A series of bit-level data streams are obtained after bit coding, and symbol-level data streams are obtained after modulation. A time interleaving module is inserted between the modulation and pilot insertion modules, that is, time interleaving is performed on the modulated symbols.

Specifically, the time-domain interleaving module includes: after the modulation module, a symbol-level data stream is obtained, and the data expression of one OFDM symbol is: a _k =[ _ak (1), _ak (2),... , a _k (L)] ^T (1); wherein, L represents the length of the data in one frame, k represents the user k, [] ^T represents the transpose operation;

其中

为第i个OFDM符号的第j个数据；将N个OFDM符号的数据形成发射过程后的数据矩阵A_k顺次排列为:The number of 5G broadcasting system transmission subframes is M, and the number of OFDM symbols in each subframe is N, forming the data matrix after the transmission process

in

is the j-th data of the i-th OFDM symbol; the data of the N OFDM symbols is formed into the data matrix A _k after the transmission process and is arranged in sequence as:

共计N×L个数据符号；将数据P按行顺次写入交织器中，并按列顺次读出，交织器为m×n大小的矩阵存储器，其中m代表交织器矩阵存储器的行数，n代表交织器矩阵存储器的列数；

A total of N×L data symbols; the data P is written into the interleaver in row order, and read out in column order, the interleaver is a matrix memory of m×n size, where m represents the number of rows of the interleaver matrix memory , n represents the number of columns of the interleaver matrix memory;

When the data symbol N×L is larger than the size of the interleaver m×n, the extra data symbols do not participate in the interleaving, that is, the first m×n data symbols are written into the interleaver; when the data symbol N×L is less than or equal to the interleaver m× n size, then the data symbols N×L all participate in the interleaving; the data symbols after passing through the interleaver are:

Rearranging the interleaved data symbols into a data matrix to be sent is:

The obtained data matrix B _K and the data of the excess part not participating in the interleaving are output to the pilot insertion module.

其中，6144表示最大码块的长度，24表示校验比特的长度，p表示调制阶数；Specifically, the expression of the number of columns n is:

Among them, 6144 represents the length of the largest code block, 24 represents the length of the check bit, and p represents the modulation order;

其中，

表示取整运算，其中N×L是数据符号的个数，n是交织器列数的大小。The expression of the number of lines m is:

in,

Represents a rounding operation, where N×L is the number of data symbols, and n is the size of the number of interleaver columns.

Specifically, the symbol-level data stream obtained after the modulation module includes:

A 5G broadcast system transmits a frame containing 10 subframes, each subframe has a time domain of 1ms, and each frame is divided into two equal-sized half-frames. For the downlink, a variety of OFDM waveform parameters are supported, and the subcarrier spacing of the subframe satisfies Δf=2 ^μ ·15 [kHz]; where μ represents the parameter value.

The receiving module includes: passing each frame of data transmitted by the sending module through the channel sequentially through the cyclic prefix removal module, the Fourier transform module and the channel estimation and equalization module to obtain a symbol-level data stream, and passing the obtained symbol-level data through the The time-domain deinterleaving module obtains the symbol data in the sequence before the interleaving module, and passes the obtained symbol-level data through the demodulation module and the bit decoding module in turn to obtain the bit data received by the receiver, and completes 5G broadcast communication.

Specifically, the time-domain de-interleaving module includes: de-interleaving of symbol-level data streams and channel parameter de-interleaving estimated by pilot insertion after the channel estimation and equalization module;

After the channel estimation and equalization module, the symbol-level data stream deinterleaving is obtained: after channel estimation and equalization, the symbol-level data stream expression is:

The symbol-level data streams C _k obtained after the channel estimation and equalization modules are sequentially arranged as:

共计N×L个数据符号；将数据Q按列顺次写入解交织器中，并按行顺次读出，解交织器为m×n大小的矩阵存储器；其中m代表交织器矩阵存储器的行数，n代表交织器矩阵存储器的列数；解交织器行数m与列数n的大小与交织器的大小相同；

A total of N×L data symbols; the data Q is written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size; where m represents the value of the matrix memory of the interleaver. The number of rows, n represents the number of columns of the interleaver matrix memory; the size of the deinterleaver row number m and the column number n is the same as the size of the interleaver;

When the N×L of the data symbols is greater than the m×n size of the deinterleaver, the excess data symbols do not participate in the deinterleaving, that is, the first m×n data symbols are written into the deinterleaver; when the data symbols N×L are smaller than the deinterleaver equal to the size of the deinterleaver m×n, then all the data symbols N×L participate in the interleaving;

The data symbols after deinterleaver are:

Rearrange the deinterleaved data symbols as

Deinterleaving of channel parameters estimated by pilot insertion: The channel parameters estimated by pilot insertion are:

共计N×L个信道参数；将重新排列后的信道参数J按列顺次写入解交织器中，并按行顺次读出，解交织器为m×n大小的矩阵存储器；The channel parameters H _k are arranged in sequence as:

A total of N×L channel parameters; the rearranged channel parameters J are written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size;

When the number of channel parameters N×L is greater than the size m×n of the deinterleaver, the excess channel parameters do not participate in the deinterleaving, that is, only the first m×n channel parameters are written into the deinterleaver; The number of N×L is less than or equal to the size of the deinterleaver m×n, then the number of channel parameters N×L all participate in the interleaving;

The channel parameters after deinterleaver are listed as:

Rearrange the deinterleaved channel parameters as

The rearranged de-interleaved data proves D _k , R _k and the data and channel parameters of the excess part that did not participate in the de-interleaving and output to the demodulation module.

The following preferred examples describe the present invention in further detail:

It should be noted that the parameters of the embodiments do not affect the generality of the present invention, and the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and preferred examples:

A communication method of a 5G broadcast system with a time-domain interleaving function of the present invention includes a sending process and a receiving process, and the sending process includes: bit coding, modulation, time-domain interleaving, framing, pilot frequency insertion, IFFT, and cyclic prefix insertion , the receiving process includes: removing cyclic prefix, FFT, channel estimation and equalization, time domain deinterleaving, demodulation, and bit decoding. The system flow is shown in Figure 1.

The implementation parameters of the embodiment of the present invention are as follows: the relative speed of the communication target is 250km/h, the modulation mode of 64QAM is used in the transmission process, Polar is used as the data channel coding scheme, the number of transmitting antennas is 2, and the number of receiving antennas is 2, The channel model is a TDL-B channel with 20us delay, the CP length is 100us, the OFDM symbol length is 400us, the system bandwidth is 10MHz, the subcarrier spacing is 2.5kHz, and the number of subcarriers is 3600, in this case a subframe There are 2 OFDM symbols inside.

In this embodiment, an interleaving operation is performed on the data symbols after the modulating step at the transmitting end.

其中

为第i个OFDM符号的第j个数据；Suppose the input data of user k in the time-domain interleaving step is _ak =[ _ak (1), _ak (2), . . . , _ak (3600)] ^T , since there are two OFDMs in one subframe symbol, the input data is doubled to form the expanded data matrix of the transmission process as

in

is the jth data of the ith OFDM symbol;

共计7200个数据符号；Arrange the data symbols carried by the two OFDM symbols in the above process in sequence as

A total of 7200 data symbols;

In this embodiment, if the modulation mode is 64QAM, the number of columns of the interleaver is 1020 and the number of rows is 7, that is, the interleaver is a matrix memory with a size of 7×1020, and the data column P is written into the interleaver row by row. The number of data symbols involved in interleaving is 7140, and the extra 60 data symbols do not participate in interleaving, that is, the first 7140 data symbols are written into the interleaver, and the process of interleaving transformation is shown in Figure 2 shown;

将交织后的序列重新排列成待发送的数据矩阵为

After the above-mentioned data symbols P have undergone an interleaving process of advancing and listing, the order of arrangement has changed, that is,

Rearrange the interleaved sequence into a data matrix to be sent as

The data matrix B _k obtained after interleaving is output to the next framing step.

In this embodiment, a corresponding time-domain deinterleaving step is performed after the channel estimation and equalization steps at the receiving end, and the data symbols and the estimated channel parameters are deinterleaved respectively.

重新排列为一列数据，即为

共计7200个数据符号；信道估计步骤后的信道参数为

将它顺次重组为一列数据，即为

共计7200个信道参数；Combine the channel estimation with the data of user k after the equalization step

Rearranged into a column of data, that is

A total of 7200 data symbols; the channel parameters after the channel estimation step are

It is sequentially reorganized into a column of data, which is

A total of 7200 channel parameters;

Output the rearranged data column Q and channel parameter column J to the deinterleaver. The dimension of the deinterleaver is the same as that of the interleaver, which is 7×1020. Write the data column Q and the channel parameter column J into the interleaver row by row. The number of data symbols and channel parameters involved in deinterleaving is 7140, and the extra 60 data symbols and channel parameters do not participate in deinterleaving, that is, the first 7140 data symbols and the first 7140 The channel parameters are written into the deinterleaver, and the process of deinterleaving transformation is shown in Figure 3;

解交织后的数据重新排列为

上述信道参数J经过一个列进行出的解交织过程后，排列顺次发生了变化，即为

解交织后的信道参数重新排列为

此时已恢复了时域交织步骤前的数据符号和信道参数的顺序；After the above-mentioned data symbol Q undergoes a deinterleaving process performed by one column, the order of arrangement has changed, that is,

The deinterleaved data is rearranged as

After the above-mentioned channel parameter J undergoes a deinterleaving process performed by one column, the arrangement sequence has changed, that is,

The channel parameters after deinterleaving are rearranged as

At this point, the order of data symbols and channel parameters before the time-domain interleaving step has been restored;

The rearranged deinterleaved data matrix D _k and channel parameter matrix R _k are output to the next demodulation step. Finally, through comparison, it is found that a 5G broadcast communication method with a time-domain interleaving function provided by the present invention has a performance gain of about 2dB compared with the traditional broadcast communication method.

Those skilled in the art know that, in addition to implementing the system, device and each module provided by the present invention in the form of pure computer readable program code, the system, device and each module provided by the present invention can be completely implemented by logically programming method steps. The same program is implemented in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, and embedded microcontrollers, among others. Therefore, the system, device and each module provided by the present invention can be regarded as a kind of hardware component, and the modules used for realizing various programs included in it can also be regarded as the structure in the hardware component; A module for realizing various functions can be regarded as either a software program for realizing a method or a structure within a hardware component.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and the features in the embodiments may be combined with each other arbitrarily without conflict.

Claims (6)

1. A 5G broadcast communication method based on time domain interleaving, characterized in that, comprising: a sending step and a receiving step; The sending step includes: sequentially passing the bit sequence to be sent through the bit coding step and the modulation step to obtain a symbol-level data stream, subjecting the symbol-level data stream to a time-domain interleaving step to obtain a data matrix, and sequentially passing the data matrix through the pilot frequency The frame data is obtained after the inserting step, the inverse fast Fourier transform step and the inserting cyclic prefix step, and each frame of data is transmitted through the channel to the receiving step; The receiving step includes: passing each frame of data transmitted through the channel in the sending step through the cyclic prefix removal step, the Fourier transform step, and the channel estimation and equalization steps to obtain a symbol-level data stream, and passing the obtained symbol-level data through the steps. The time-domain deinterleaving step obtains the symbol data in the order before the interleaving step, and the obtained symbol-level data is sequentially subjected to the demodulation step and the bit decoding step to obtain the bit data received by the receiving end, and the 5G broadcast communication is completed; The time-domain deinterleaving step includes: symbol-level data stream deinterleaving after the channel estimation and equalization steps and channel parameter deinterleaving estimated by pilot insertion; After the channel estimation and equalization steps, the symbol-level data stream deinterleaving is obtained: after channel estimation and equalization, the symbol-level data stream expression is:

The symbol-level data streams C _k obtained after the channel estimation and equalization steps are sequentially arranged as:

A total of N×L data symbols; the data Q is written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size; where m represents the value of the matrix memory of the interleaver. The number of rows, n represents the number of columns of the interleaver matrix memory; the size of the deinterleaver row number m and the column number n is the same as the size of the interleaver; When the N×L of the data symbols is greater than the m×n size of the deinterleaver, the excess data symbols do not participate in the deinterleaving, that is, the first m×n data symbols are written into the deinterleaver; when the N×L of the data symbols is smaller than the deinterleaver equal to the size of the deinterleaver m×n, then all the data symbols N×L participate in the interleaving; The data symbols after deinterleaver are:

Rearrange the deinterleaved data symbols as

Deinterleaving of channel parameters estimated by pilot insertion: The channel parameters estimated by pilot insertion are:

Arrange the channel parameters H _k sequentially as:

A total of N×L channel parameters; the rearranged channel parameters J are written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size; When the number of channel parameters N×L is greater than the size of the deinterleaver m×n, the excess channel parameters do not participate in the deinterleaving, that is, only the first m×n channel parameters are written into the deinterleaver; The number of N×L is less than or equal to the size of the deinterleaver m×n, then the number of channel parameters N×L all participate in the interleaving; The channel parameters after deinterleaver are listed as:

Rearrange the deinterleaved channel parameters as

outputting the rearranged deinterleaved data to demonstrate _Dk , _Rk and the data and channel parameters of the excess part that did not participate in the deinterleaving to the demodulation step; The expression of the number of columns n is:

Among them, _Tmax represents the length of the largest code block, _Bmax represents the length of the parity bit, and p represents the modulation order; The row number m expression is:

in,

Represents a rounding operation, where N×L is the number of data symbols, and n is the size of the number of interleaver columns. 2. A 5G broadcast communication method based on time-domain interleaving according to claim 1, wherein the time-domain interleaving step comprises: after the modulation step, a symbol-level data stream is obtained, and the data expression of an OFDM symbol The formula is: a _k =[ _ak (1), _ak (2),..., _ak (L)] ^T (1); where L represents the length of data in one frame, k represents user k, [] ^T represents the transpose operation; The number of 5G broadcasting system transmission subframes is M, and the number of OFDM symbols in each subframe is N, forming the data matrix after the transmission process

in

is the j-th data of the i-th OFDM symbol; the data of the N OFDM symbols is formed into the data matrix A _k after the transmission process and is arranged in sequence as:

A total of N×L data symbols; the data P is written into the interleaver in row order, and read out in column order, the interleaver is a matrix memory of m×n size, where m represents the number of rows of the interleaver matrix memory , n represents the number of columns of the interleaver matrix memory; When the data symbol N×L is larger than the size of the interleaver m×n, the extra data symbols do not participate in the interleaving, that is, the first m×n data symbols are written into the interleaver; when the data symbol N×L is less than or equal to the interleaver m× n size, then the data symbols N×L all participate in the interleaving; the data symbols after passing through the interleaver are:

Rearranging the interleaved data symbols into a data matrix to be sent is:

The obtained data matrix B _K and the data of the excess part not participating in the interleaving are output to the pilot insertion step. 3. The 5G broadcast communication method based on time-domain interleaving according to claim 2, wherein the obtaining of the symbol-level data stream after the modulation step comprises: A 5G broadcast system transmits a frame containing a preset number of subframes. Each subframe has a preset time domain value. Each frame is divided into two equal-sized half-frames. One set of half-frames on one carrier is used for uplink, and the other The group field is used for downlink, supports multiple OFDM waveform parameters, and the sub-carrier spacing of the subframe satisfies Δf=2 ^μ ·15 [kHz]; where μ represents the parameter value. 4. A 5G broadcast communication system based on time-domain interleaving, comprising: a sending module and a receiving module; The sending module includes: passing the bit sequence to be sent through the bit coding module and the modulation module in sequence to obtain a symbol-level data stream, passing the symbol-level data stream through a time-domain interleaving module to obtain a data matrix, and sequentially passing the data matrix through a pilot frequency After inserting the module, the inverse fast Fourier transform module and the cyclic prefix module, the frame data is obtained, and each frame data is transmitted to the receiving module through the channel; The receiving module includes: passing each frame of data transmitted by the sending module through the channel sequentially through the cyclic prefix removal module, the Fourier transform module and the channel estimation and equalization module to obtain a symbol-level data stream, and passing the obtained symbol-level data through the The time-domain deinterleaving module obtains the symbol data in the sequence before the interleaving module, and passes the obtained symbol-level data through the demodulation module and the bit decoding module in turn to obtain the bit data received by the receiver, and completes 5G broadcast communication; The time-domain deinterleaving module includes: deinterleaving of symbol-level data stream after channel estimation and equalization module and channel parameter deinterleaving estimated by pilot insertion; After the channel estimation and equalization module, the symbol-level data stream deinterleaving is obtained: after channel estimation and equalization, the symbol-level data stream expression is:

The symbol-level data streams C _k obtained after the channel estimation and equalization modules are sequentially arranged as:

A total of N×L data symbols; the data Q is written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size; where m represents the value of the matrix memory of the interleaver. The number of rows, n represents the number of columns of the interleaver matrix memory; the size of the deinterleaver row number m and the column number n is the same as the size of the interleaver; When the N×L of the data symbols is greater than the m×n size of the deinterleaver, the excess data symbols do not participate in the deinterleaving, that is, the first m×n data symbols are written into the deinterleaver; when the N×L of the data symbols is smaller than the deinterleaver equal to the size of the deinterleaver m×n, then all the data symbols N×L participate in the interleaving; The data symbols after deinterleaver are:

Rearrange the deinterleaved data symbols as

Deinterleaving of channel parameters estimated by pilot insertion: The channel parameters estimated by pilot insertion are:

The channel parameters H _k are arranged in sequence as:

A total of N×L channel parameters; the rearranged channel parameters J are written into the deinterleaver in sequence by column, and read out in sequence by row, and the deinterleaver is a matrix memory of m×n size; When the number of channel parameters N×L is greater than the size of the deinterleaver m×n, the excess channel parameters do not participate in the deinterleaving, that is, only the first m×n channel parameters are written into the deinterleaver; The number N×L of the deinterleaver is less than or equal to the size of the deinterleaver m×n, then the number of channel parameters N×L all participate in the interleaving; The channel parameters after deinterleaver are listed as:

Rearrange the deinterleaved channel parameters as

outputting the rearranged deinterleaved data to prove _Dk , _Rk and the data and channel parameters of the excess part that did not participate in the deinterleaving to the demodulation module; The expression of the number of columns n is:

Among them, _Tmax represents the length of the largest code block, _Bmax represents the length of the parity bit, and p represents the modulation order; The expression of the number of lines m is:

in,

Represents a rounding operation, where N×L is the number of data symbols, and n is the size of the number of interleaver columns. 5 . The 5G broadcast communication system based on time domain interleaving according to claim 4 , wherein the time domain interleaving module comprises: after the modulation module, a symbol-level data stream is obtained, and the data expression of an OFDM symbol is 5. 6 . The formula is: a _k =[ _ak (1), _ak (2),..., _ak (L)] ^T (1); where L represents the length of data in one frame, k represents user k, [] ^T represents the transpose operation; The number of 5G broadcasting system transmission subframes is M, and the number of OFDM symbols in each subframe is N, forming the data matrix after the transmission process

in

is the j-th data of the i-th OFDM symbol; the data of the N OFDM symbols is formed into the data matrix A _k after the transmission process and is arranged in sequence as:

A total of N×L data symbols; the data P is written into the interleaver in row order, and read out in column order, the interleaver is a matrix memory of m×n size, where m represents the number of rows of the interleaver matrix memory , n represents the number of columns of the interleaver matrix memory; When the data symbol N×L is larger than the size of the interleaver m×n, the extra data symbols do not participate in the interleaving, that is, the first m×n data symbols are written into the interleaver; when the data symbol N×L is less than or equal to the interleaver m× n size, then the data symbols N×L all participate in the interleaving; the data symbols after passing through the interleaver are:

Rearranging the interleaved data symbols into a data matrix to be sent is:

The obtained data matrix B _K and the data of the excess part not participating in the interleaving are output to the pilot insertion module. 6. The 5G broadcast communication system based on time-domain interleaving according to claim 5, wherein the obtained symbol-level data stream after the modulation module comprises: A 5G broadcast system transmits a frame containing a preset number of subframes. Each subframe has a preset time domain value. Each frame is divided into two equal-sized half-frames. One set of half-frames on one carrier is used for uplink, and the other The group field is used for downlink, supports multiple OFDM waveform parameters, and the sub-carrier spacing of the subframe satisfies Δf=2 ^μ ·15 [kHz]; where μ represents the parameter value.

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