CN113055122B - 5G broadcast communication method and system based on time domain interleaving - Google Patents
5G broadcast communication method and system based on time domain interleaving Download PDFInfo
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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
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a 5G broadcast communication method and system based on time domain interleaving. And more particularly, to a communication method having a time domain interleaving function and applicable to a 5G broadcasting system in a rooofop and car-mounted receiving mode.
Background
With the coming of the 5G era, high-speed mobile communication networks can carry and spread more abundant multimedia resources, which will bring huge impact on the broadcast television industry. The emergence of 5G will bring challenges to the conventional digital terrestrial broadcasting technology and also bring new opportunities for mobile reception of broadcast television. The 5G will support services such as mobile video, ultra high definition, augmented reality, virtual reality and the like, but in the face of rapid growth of multimedia services of large-scale users, the explosive traffic consumption will greatly affect the quality of service for users to access the mobile communication network. Against this background, eMBMS (enhanced Broadcast and multicast) based on LTE (Long Term Evolution) and its Evolved version, entv (enhancement for TV service) in Rel-14 provide ideas for solving this contradiction.
In broadcast communication, the channel conditions of the wireless channel are complicated and severe due to the characteristics of the wireless channel. For example, the presence of pedestrians, vehicles and buildings causes the reflection and diffraction phenomena of the signals, which makes the finally received signals actually be the superposition signals of the same signal passing through different paths, and the time delay and the phase of the sub-signals in each path are different, so the finally synthesized total signal tends to fluctuate greatly, and this phenomenon is called multipath fading. The signal fading caused by the bad channel often causes the data in the receiver to have continuous burst errors, and the existing demodulation and error correction technology is easy to resist the scattered random errors, but is difficult to correct the continuous 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 a time domain interleaving technique.
The time domain interleaving has the main function of converting continuous long deep fading occurring in the time domain into continuous short fading occurring approximately randomly, and the short fading occurring approximately randomly can be corrected by the system. The interleaving implementation principle aims at the channel where the system is located, and facilitates the implementation of hardware and reduces the complexity and the expense of equipment while dispersing continuous deep fading generated in the channel into an approximate random mode as much as possible.
Patent document CN101582739A (application number: 200810126458.6) discloses a digital broadcast signal transmitting apparatus, comprising at least one first coding unit, each for forward error correction coding of data in one sub-channel; each time domain interleaving unit receives data output by one first coding unit and performs time domain interleaving on the coded data; the first multiplexing unit is used for multiplexing the interleaved data output by each time domain interleaving unit into MSC data; a second encoding unit, configured to perform forward error correction encoding on the second group of data to obtain FIC data; the differential modulation unit is used for performing differential modulation on the FIC data by adopting a first modulation mode and performing differential modulation on the MSC data by adopting a second modulation mode; the modulation level of the first modulation mode is lower than that of the second modulation mode; and the frame generation and transmission unit is used for generating a signal unit transmission frame by using the differential modulation symbol sequence generated by the differential modulation unit and transmitting the signal unit transmission frame.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a 5G broadcast communication method and system based on time domain interleaving.
The invention provides a 5G broadcast communication method based on time domain interleaving, which comprises the following steps: a transmitting step and a receiving step;
the transmitting step includes: 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 on the symbol-level data stream 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;
the receiving step includes: and sequentially carrying out a cyclic prefix removing step, a Fourier transform step and a channel estimation and equalization step on each frame of data transmitted by a channel in the transmitting step to obtain a symbol-level data stream, carrying out a time domain de-interleaving step on the obtained symbol-level data to obtain sequential symbol data before the interleaving step, and sequentially carrying out a demodulation step and a bit decoding step on the obtained symbol-level data to obtain bit data received by a receiving end to finish the 5G broadcast communication.
Preferably, the time domain interleaving step includes: obtaining a data stream of a symbol level after the modulation step, wherein the data expression of one OFDM symbol is as follows: a is k ＝[a k (1),a k (2),...,a k (L)] T (1) (ii) a Where L represents the length of data in a frame, k represents user k,[] T representing a transpose operation;
the number of the transmitting subframes of the 5G broadcasting system is M, the number of the data of the OFDM symbols in each subframe is N, and a data matrix after the transmitting process is formed
Wherein
J data of the ith OFDM symbol; forming data of N OFDM symbols into data matrix A after transmission process k The sequence is that:
when the size of the data symbol NxL is larger than the size of the interleaver mxn, the excessive data symbols do not participate in interleaving, namely, the previous mxn data symbols are written into the interleaver; when the size of the data symbol NxL is smaller than or equal to the size of the interleaver m x N, the data symbol NxL participates in interleaving completely; the data symbols after the interleaver are:
rearranging the interleaved data symbols into a data matrix to be sent is as follows:
the obtained data matrix B K And the data of the excess part not participating in the interleaving is output to the pilot inserting step.
Preferably, the time domain deinterleaving step includes: de-interleaving the symbol-level data stream and de-interleaving the pilot frequency insertion estimated channel parameters after the channel estimation and equalization steps;
and obtaining the de-interleaving of the data stream at the symbol level after the channel estimation and equalization steps: the symbol-level data flow expression obtained after channel estimation and equalization is as follows:
the symbol-level data stream C obtained after the channel estimation and equalization steps is processed k The sequence is that:
when the NxL of the data symbols is larger than the mxn size of the de-interleaver, the excessive data symbols do not participate in de-interleaving, i.e. the first mxn data symbols are written into the de-interleaver; when the NxL of the data symbols is smaller than or equal to the size of the de-interleaver m x N, the NxL of the data symbols all participate in interleaving;
the data symbols after the deinterleaver are:
rearranging the deinterleaved data symbols
And de-interleaving the channel parameters estimated by pilot insertion: the channel parameters to be estimated by pilot insertion are:
channel parameter H k The sequence is that:
a total of nxl channel parameters; writing the rearranged channel parameters J into a deinterleaver in sequence according to columns, and reading out the rearranged channel parameters J in sequence according to rows, wherein the deinterleaver is a matrix memory with the size of m multiplied by n;
when the number NxL of the channel parameters is larger than the size mxn of the de-interleaver, the excessive channel parameters do not participate in de-interleaving, namely only the first mxn channel parameters are written into the de-interleaver; when the number NxL of the channel parameters is smaller than or equal to the size of the deinterleaver mxn, the number NxL of the channel parameters completely participate in interleaving;
the channel parameters after the de-interleaver are listed as:
rearranging the deinterleaved channel parameters
Demosaicing the rearranged deinterleaved data D k 、R k And outputting the data and channel parameters of the output part which does not participate in the de-interleaving to the demodulation step.
Preferably, the column number n is expressed as:
wherein, T max Denotes the length of the largest code block, B max Representing the length of the check bit, and p represents the modulation order;
the expression of the number m of rows is:
wherein,
denotes a rounding operation, where nxl is the number of data symbols and N is the size of the number of interleaver columns.
Preferably, the obtaining of the data stream at the symbol level after the modulating step includes:
the 5G broadcast system transmits one frame which comprises a plurality of preset subframes, the time domain of each subframe is a preset value, each frame is divided into two half frames with equal size, one group of half frames on one carrier is used for an uplink, the other group of half frames is used for a downlink, various OFDM waveform parameters are supported, and the subcarrier interval of the subframe meets the condition that delta f is 2 μ ·15[kHz](ii) a Where μ represents a parameter value.
The invention provides a 5G broadcast communication system based on time domain interleaving, which comprises: a transmitting module and a receiving module;
the sending module comprises: the method comprises the steps that a bit sequence to be sent sequentially passes through a bit coding module and a modulation module to obtain a symbol-level data stream, the symbol-level data stream passes through a time domain interleaving module to obtain a data matrix, the data matrix sequentially passes through a pilot frequency insertion module, a fast Fourier inverse transformation module and a cyclic prefix insertion module to obtain frame data, and each frame data is transmitted to a receiving module through a channel;
the receiving module includes: each frame of data transmitted by a sending module through a channel sequentially passes through a cyclic prefix removing module, a Fourier transform module and a channel estimation and equalization module to obtain a symbol-level data stream, the obtained symbol-level data passes through a time domain de-interleaving module to obtain symbol data in sequence before an interleaving module, the obtained symbol-level data sequentially passes through a demodulation module and a bit decoding module to obtain bit data received by a receiving end, and 5G broadcast communication is completed.
Preferably, the time domain interleaving module includes: obtaining a data stream of a symbol level after passing through a modulation module, wherein a data expression of one OFDM symbol is as follows: a is a k ＝[a k (1),a k (2),...,a k (L)] T (1) (ii) a Wherein L represents data within a frameLength, k represents user k, [ 2 ]] T Representing a transpose operation;
the number of the transmitting subframes of the 5G broadcasting system is M, the number of the OFDM symbols in each subframe is N, and a data matrix after the transmitting process is formed
Wherein
J data of the ith OFDM symbol; forming data of N OFDM symbols into data matrix A after transmission process k The following are arranged in sequence:
when the size of the data symbols NxL is larger than the size of the interleaver m x N, the excessive data symbols do not participate in interleaving, namely, the previous m x N data symbols are written into the interleaver; when the size of the data symbol NxL is smaller than or equal to the size of the interleaver m x N, the data symbol NxL participates in interleaving completely; the data symbols after the interleaver are:
rearranging the interleaved data symbols into a data matrix to be sent is as follows:
the obtained data matrix B K And the data of the outgoing part which does not participate in interleaving is output to the pilot insertion module.
Preferably, the time domain deinterleaving module includes: de-interleaving the symbol-level data stream and de-interleaving the channel parameters estimated by pilot frequency insertion after passing through a channel estimation and equalization module;
and obtaining the de-interleaving of the data stream at the symbol level after the channel estimation and equalization module: the symbol-level data flow expression obtained after channel estimation and equalization is as follows:
the symbol-level data stream C obtained after the channel estimation and equalization module k The following are arranged in sequence:
when the NxL of the data symbols is larger than the mxn size of the de-interleaver, the excessive data symbols do not participate in de-interleaving, i.e. the first mxn data symbols are written into the de-interleaver; when the NxL of the data symbols is smaller than or equal to the size of the de-interleaver m x N, the NxL of the data symbols all participate in interleaving;
the data symbols after the deinterleaver are:
rearranging the deinterleaved data symbols
And de-interleaving the channel parameters estimated by pilot insertion: the channel parameters estimated by pilot insertion are:
channel parameter H k The sequence is that:
a total of nxl channel parameters; writing the rearranged channel parameters J into a de-interleaver in sequence according to columns, and reading out the rearranged channel parameters J in sequence according to rows, wherein the de-interleaver is a matrix memory with the size of m multiplied by n;
when the number NxL of the channel parameters is larger than the size mxn of the de-interleaver, the excessive channel parameters do not participate in de-interleaving, namely only the first mxn channel parameters are written into the de-interleaver; when the number NxL of the channel parameters is smaller than or equal to the size of the deinterleaver mxn, the number NxL of the channel parameters completely participate in interleaving;
the channel parameters after the de-interleaver are listed as:
rearranging the deinterleaved channel parameters
Proving the rearranged de-interleaved data D k 、R k And the data and channel parameters of the output part which does not participate in the de-interleaving are output to the demodulation module.
Preferably, the column number n is expressed as:
wherein, T max Denotes the length of the largest code block, B max Representing the length of the check bit, and p represents the modulation order;
the expression of the number m of rows is:
wherein,
denotes a rounding operation, where nxl is the number of data symbols and N is the size of the number of interleaver columns.
Preferably, the obtaining of the symbol-level data stream after passing through the modulation module includes:
the 5G broadcasting system transmits one frame which comprises a plurality of preset subframes, the time domain of each subframe is a preset value, each frame is divided into two half frames with equal size, one group of half frames are used for an uplink on one carrier, the other group of half frames are used for a downlink, various OFDM waveform parameters are supported, and the subcarrier interval of the subframes satisfies the condition that delta f is 2 μ ·15[kHz](ii) a Where μ represents a parameter value.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the technical scheme of the invention, which is designed for the car-mounted and the rooofop stable reception under the LPLT, MPMT and HPHT modes of a 5G broadcast communication system;
2. the invention can also support a channel model with larger path delay;
3. the invention can resist larger multipath time delay expansion, can support the application scene of Multimedia Broadcast Multicast Service (MBMS), and improves the integral fault tolerance performance of the system.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of the operation of the communication mode of the 5G broadcast system;
FIG. 2 is a diagram illustrating an interleaving process in the transmission process according to the embodiment;
fig. 3 is a schematic diagram of a deinterleaving process in the receiving process according to the embodiment.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention aims to provide a communication mode with a time domain interleaving function. The invention provides a communication mode with a time domain interleaving function, which is suitable for a 5G broadcast system in a soft op and car-mounted receiving mode, and is used for meeting the requirements of a channel model which needs to support larger-path time delay and stable receiving in LPLT, MPMT and HPHT scenes in the broadcast communication system and improving the fault-tolerant rate of the system.
The invention provides a 5G broadcast communication method based on time domain interleaving, which comprises the following steps: a transmitting step and a receiving step;
the transmitting step includes: 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 on the symbol-level data stream 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;
after bit coding, a series of data streams of bit level is obtained, after modulation, a data stream of symbol level is obtained, and a time interleaving step is inserted between the modulation step and the pilot frequency inserting step, namely, the time interleaving operation is carried out on the modulated symbols.
Specifically, the time domain interleaving step includes: obtaining a data stream of a symbol level after the modulation step, wherein the data expression of one OFDM symbol is as follows: a is a k ＝[a k (1),a k (2),...,a k (L)] T (1) (ii) a Wherein L represents the length of data in one frame, and k represents a user k, [ 2 ]] T Representing a transpose operation;
the number of the transmitting subframes of the 5G broadcasting system is M, the number of the data of the OFDM symbols in each subframe is N, and a data matrix after the transmitting process is formed
Wherein
J data of the ith OFDM symbol; forming data of N OFDM symbols into data matrix A after transmission process k The sequence is that:
when the size of the data symbol NxL is larger than the size of the interleaver mxn, the excessive data symbols do not participate in interleaving, namely, the previous mxn data symbols are written into the interleaver; when the size of the data symbol NxL is smaller than or equal to the size of the interleaver m x N, the data symbol NxL participates in interleaving completely; the data symbols after the interleaver are:
rearranging the interleaved data symbols into a data matrix to be sent is as follows:
the obtained data matrix B K And outputting the data of the outgoing part which does not participate in interleaving to the pilot inserting step.
Specifically, the column number n is expressed as:
wherein 6144 represents the length of the maximum code block, 24 represents the length of the check bits, and p represents the modulation order;
the number m of rows is expressed as:
wherein,
denotes a rounding operation, where nxl is the number of data symbols and N is the size of the number of interleaver columns.
Specifically, the obtaining of the symbol-level data stream after the modulation step includes:
the 5G broadcast system transmits a frame comprising 10 subframes, wherein each subframe has a time domain of 1ms, each frame is divided into two equal-sized half frames, one group of half frames on a carrier is used for an uplink, the other group of half frames is used for a downlink, various OFDM waveform parameters are supported, and the subcarrier interval of the subframe satisfies that delta f is 2 μ ·15[kHz](ii) a Where μ represents a parameter value.
The receiving step includes: and sequentially carrying out a cyclic prefix removing step, a Fourier transform step and a channel estimation and equalization step on each frame of data transmitted by a channel in the transmitting step to obtain a symbol-level data stream, carrying out a time domain de-interleaving step on the obtained symbol-level data to obtain sequential symbol data before the interleaving step, and sequentially carrying out a demodulation step and a bit decoding step on the obtained symbol-level data to obtain bit data received by a receiving end to finish the 5G broadcast communication.
Specifically, the time domain deinterleaving step includes: de-interleaving the symbol-level data stream and de-interleaving the pilot frequency insertion estimated channel parameters after the channel estimation and equalization steps;
and obtaining the de-interleaving of the data stream at the symbol level after the channel estimation and equalization steps: the symbol-level data flow expression obtained after channel estimation and equalization is as follows:
the symbol-level data stream C obtained after the channel estimation and equalization steps k The sequence is that:
when the NxL of the data symbols is larger than the mxn size of the deinterleaver, the excessive data symbols do not participate in the deinterleaving, that is, the first mxn data symbols are written into the deinterleaver; when the NxL of the data symbols is smaller than or equal to the size of the de-interleaver m x N, the NxL of the data symbols all participate in interleaving;
the data symbols after the deinterleaver are:
rearranging the deinterleaved data symbols
De-interleaving the channel parameters estimated by pilot insertion: the channel parameters estimated by pilot insertion are:
channel parameter H k The sequence is that:
a total of nxl channel parameters; writing the rearranged channel parameters J into a deinterleaver in sequence according to columns, and reading out the rearranged channel parameters J in sequence according to rows, wherein the deinterleaver is a matrix memory with the size of m multiplied by n;
when the number NxL of the channel parameters is larger than the size mxn of the de-interleaver, the excessive channel parameters do not participate in de-interleaving, namely only the first mxn channel parameters are written into the de-interleaver; when the number NxL of the channel parameters is less than or equal to the size of the de-interleaver m xn, the number NxL of the channel parameters all participate in interleaving;
the channel parameters after the de-interleaver are listed as:
rearranging the deinterleaved channel parameters
Proving the rearranged de-interleaved data D k 、R k And outputting the data and channel parameters of the output part which does not participate in the de-interleaving to the demodulation step.
The invention provides a 5G broadcast communication system based on time domain interleaving, which comprises: a transmitting module and a receiving module;
the sending module comprises: the method comprises the steps that a bit sequence to be sent sequentially passes through a bit coding module and a modulation module to obtain a symbol-level data stream, the symbol-level data stream passes through a time domain interleaving module to obtain a data matrix, the data matrix sequentially passes through a pilot frequency insertion module, a fast Fourier inverse transformation module and a cyclic prefix insertion module to obtain frame data, and each frame data is transmitted to a receiving module through a channel;
after bit coding, a series of bit-level data streams are obtained, after modulation, symbol-level data streams are obtained, and a time interleaving module is inserted between the modulation and pilot insertion modules, that is, time interleaving operation is performed on modulated symbols.
Specifically, the time domain interleaving module includes: obtaining a symbol-level data stream after passing through a modulation module, wherein the data expression of one OFDM symbol is as follows: a is a k ＝[a k (1),a k (2),...,a k (L)] T (1) (ii) a Wherein L represents the length of data in one frame, and k represents a user k, [ 2 ]] T Display rotorPlacing and operating;
the number of the transmitting subframes of the 5G broadcasting system is M, the number of the data of the OFDM symbols in each subframe is N, and a data matrix after the transmitting process is formed
Wherein
J data of the ith OFDM symbol; forming data of N OFDM symbols into data matrix A after transmission process k The following are arranged in sequence:
when the size of the data symbols NxL is larger than the size of the interleaver m x N, the excessive data symbols do not participate in interleaving, namely, the previous m x N data symbols are written into the interleaver; when the size of the data symbol NxL is smaller than or equal to the size of the interleaver m x N, the data symbol NxL participates in interleaving completely; the data symbols after the interleaver are:
rearranging the interleaved data symbols into a data matrix to be sent is as follows:
the obtained data matrix B K And the data of the outgoing part not participating in the interleaving is output to the pilot insertion module.
Specifically, the column number n is expressed as:
wherein 6144 represents the length of the maximum code block, 24 represents the length of the check bits, and p represents the modulation order;
the expression of the number m of rows is:
wherein,
denotes a rounding operation, where nxl is the number of data symbols and N is the size of the number of interleaver columns.
Specifically, the obtaining of the symbol-level data stream after passing through the modulation module includes:
the 5G broadcast system transmits a frame comprising 10 subframes, wherein each subframe has a time domain of 1ms, each frame is divided into two equal-sized half frames, one group of half frames on a carrier is used for an uplink, the other group of half frames is used for a downlink, various OFDM waveform parameters are supported, and the subcarrier interval of the subframe satisfies that delta f is 2 μ ·15[kHz](ii) a Where μ represents a parameter value.
The receiving module comprises: each frame of data transmitted by a sending module through a channel sequentially passes through a cyclic prefix removing module, a Fourier transform module and a channel estimation and equalization module to obtain a symbol-level data stream, the obtained symbol-level data passes through a time domain de-interleaving module to obtain symbol data in sequence before an interleaving module, the obtained symbol-level data sequentially passes through a demodulation module and a bit decoding module to obtain bit data received by a receiving end, and 5G broadcast communication is completed.
Specifically, the time domain de-interleaving module comprises: de-interleaving the symbol-level data stream and de-interleaving the channel parameters estimated by pilot frequency insertion after passing through a channel estimation and equalization module;
and obtaining the de-interleaving of the data stream at the symbol level after the channel estimation and equalization module: the symbol-level data flow expression obtained after channel estimation and equalization is as follows:
a symbol-level data stream C obtained after the channel estimation and equalization module k The sequence is that:
when the NxL of the data symbols is larger than the mxn size of the de-interleaver, the excessive data symbols do not participate in de-interleaving, i.e. the first mxn data symbols are written into the de-interleaver; when the NxL of the data symbols is smaller than or equal to the size of the deinterleaver mxn, the NxL of the data symbols all participate in interleaving;
the data symbols after the deinterleaver are:
rearranging the deinterleaved data symbols
De-interleaving the channel parameters estimated by pilot insertion: the channel parameters to be estimated by pilot insertion are:
channel parameter H k The following are arranged in sequence:
a total of nxl channel parameters; will be provided withWriting the rearranged channel parameters J into a deinterleaver in sequence according to columns, and reading the rearranged channel parameters J out in sequence according to rows, wherein the deinterleaver is a matrix memory with the size of m multiplied by n;
when the number NxL of the channel parameters is larger than the size mxn of the de-interleaver, the excessive channel parameters do not participate in de-interleaving, namely only the first mxn channel parameters are written into the de-interleaver; when the number NxL of the channel parameters is less than or equal to the size of the de-interleaver m xn, the number NxL of the channel parameters all participate in interleaving;
the channel parameters after the de-interleaver are listed as:
rearranging the deinterleaved channel parameters
Demosaicing the rearranged deinterleaved data D k 、R k And the data and channel parameters of the output part which does not participate in the de-interleaving are output to the demodulation module.
The following preferred examples further illustrate the invention in 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 with reference to the accompanying drawings and preferred embodiments:
the invention relates to a communication mode of a 5G broadcasting system with a time domain interleaving function, which comprises a sending process and a receiving process, wherein the sending process comprises the following steps: bit coding, modulation, time domain interleaving, framing, pilot frequency insertion, IFFT and cyclic prefix insertion, wherein the receiving process comprises the following steps: removing cyclic prefix, FFT, channel estimation and equalization, time domain de-interleaving, demodulation and bit decoding. The system flow is shown in fig. 1.
The implementation parameters of the embodiment of the invention are as follows: the relative speed of a communication target is 250km/h, a 64QAM modulation mode is adopted in the sending process, Polar is adopted as a data channel coding scheme, the number of transmitting antennas is 2, the number of receiving antennas is 2, a 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 interval is 2.5kHz, the number of subcarriers is 3600, and in this case, 2 OFDM symbols exist in one subframe.
In this embodiment, the interleaving operation is performed on the data symbols after the modulation step at the transmitting end.
Let the input data of user k in the time domain interleaving step be a k ＝[a k (1)，a k (2)，...，a k (3600)] T Because there are two OFDM symbols in a subframe, the input data is expanded by one time to form a data matrix after the expansion of the transmission process
Wherein
J data of the ith OFDM symbol;
arranging the data symbols carried by the two OFDM symbols in sequence in the process
A total of 7200 data symbols;
in this embodiment, if the modulation mode is 64QAM, the number of columns of the interleaver is 1020, the number of rows is 7, that is, the interleaver is a matrix memory with a size of 7 × 1020, the data columns P are sequentially written into the interleaver according to the rows and sequentially read out according to the columns, the number of data symbols participating in interleaving is 7140, the excess 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 fig. 2;
after the data symbols P are subjected to an interleaving process listed in advance, the arrangement of the data symbols P is changed in sequence, namely the data symbols P are arranged in sequence
Rearranging the interleaved sequence into a data matrix to be transmitted
The data matrix B obtained after interweaving k And outputting to the next framing step.
In this embodiment, after the channel estimation and equalization step at the receiving end, a corresponding time domain deinterleaving step is performed, and deinterleaving is performed on the data symbols and the estimated channel parameters, respectively.
Estimating and equalizing the data of user k after the channel estimation and equalization step
Rearranged into a column of data, i.e.
A total of 7200 data symbols; the channel parameters after the channel estimation step are
It is recombined into a row of data in sequence, namely
A total of 7200 channel parameters;
outputting the rearranged data column Q and channel parameter column J to a de-interleaver, wherein the dimension of the de-interleaver is 7 × 1020 the same as that of the interleaver, the data column Q and the channel parameter column J are sequentially written into the interleaver according to rows and are sequentially read out according to columns, the number of data symbols and channel parameters participating in de-interleaving is 7140, the excessive 60 data symbols and channel parameters do not participate in de-interleaving, that is, the first 7140 data symbols and the first 7140 channel parameters are written into the de-interleaver, and the process of de-interleaving transformation is shown in FIG. 3;
the data symbol Q goes through a de-interleaving process of a columnThereafter, the arrangement is changed in order, that is
Data rearrangement after deinterleaving
After the channel parameter J is processed through a de-interleaving process performed in a row, the arrangement of the channel parameter J is changed in sequence, that is, the channel parameter J is changed in sequence
Channel parameter rearrangement after de-interleaving
The sequence of the data symbols and the channel parameters before the time domain interleaving step is restored;
deinterleaved data matrix D to be rearranged k And a channel parameter matrix R k And outputting to the next demodulation step. Finally, the comparison shows that the performance of the 5G broadcast communication mode with the time domain interleaving function has about 2dB gain compared with the traditional broadcast communication mode.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. A5G broadcast communication method based on time domain interleaving is characterized by comprising the following steps: a transmitting step and a receiving step;
the transmitting step includes: 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 on the symbol-level data stream 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;
the receiving step includes: sequentially carrying out a cyclic prefix removing step, a Fourier transform step and a channel estimation and equalization step on each frame of data transmitted by a channel in the transmitting step to obtain a symbol-level data stream, carrying out a time domain de-interleaving step on the obtained symbol-level data to obtain sequential symbol data before the interleaving step, sequentially carrying out a demodulation step and a bit decoding step on the obtained symbol-level data to obtain bit data received by a receiving end, and completing 5G broadcast communication;
the time domain deinterleaving step includes: de-interleaving the symbol-level data stream and de-interleaving the pilot frequency insertion estimated channel parameters after the channel estimation and equalization steps;
and (3) obtaining data stream de-interleaving at a symbol level after the channel estimation and equalization steps: the symbol-level data flow expression obtained after channel estimation and equalization is as follows:
the symbol-level data stream C obtained after the channel estimation and equalization steps is processed k The sequence is that:
when the NxL of the data symbols is larger than the mxn size of the deinterleaver, the excessive data symbols do not participate in the deinterleaving, that is, the first mxn data symbols are written into the deinterleaver; when the NxL of the data symbols is smaller than or equal to the size of the de-interleaver m x N, the NxL of the data symbols all participate in interleaving;
the data symbols after the deinterleaver are:
rearranging the deinterleaved data symbols
And de-interleaving the channel parameters estimated by pilot insertion: the channel parameters to be estimated by pilot insertion are:
channel parameter H k The sequence is that:
a total of nxl channel parameters; writing the rearranged channel parameters J into a de-interleaver in sequence according to columns, and reading out the rearranged channel parameters J in sequence according to rows, wherein the de-interleaver is a matrix memory with the size of m multiplied by n;
when the number NxL of the channel parameters is larger than the size mxn of the de-interleaver, the excessive channel parameters do not participate in de-interleaving, namely only the first mxn channel parameters are written into the de-interleaver; when the number NxL of the channel parameters is smaller than or equal to the size of the deinterleaver mxn, the number NxL of the channel parameters completely participate in interleaving;
the channel parameters after the de-interleaver are listed as:
rearranging the deinterleaved channel parameters
Demosaicing the rearranged deinterleaved data D k 、R k And the data and channel parameters of the extra part which does not participate in the de-interleaving are output to the demodulation step;
the column number n expression is:
wherein, T max Denotes the length of the largest code block, B max Indicating the length of the check bit, and p indicating the modulation order;
the expression of the number m of rows is:
wherein,
denotes a rounding operation, where nxl is the number of data symbols and N is the size of the number of interleaver columns.
2. The time-domain interleaving-based 5G broadcast communication method as claimed in claim 1, wherein said time-domain interleaving step comprises: obtaining a data stream of a symbol level after the modulation step, wherein the data expression of one OFDM symbol is as follows: a is k ＝[a k (1),a k (2),...,a k (L)] T (1) (ii) a Wherein L represents a length of data in one frame, k represents a user k, [ 2 ]] T Representing a transpose operation;
the number of the transmitting subframes of the 5G broadcasting system is M, the number of the data of the OFDM symbols in each subframe is N, and a data matrix after the transmitting process is formed
Wherein
J data of the ith OFDM symbol; forming data of N OFDM symbols into data matrix A after transmission process k The sequence is that:
when the size of the data symbol NxL is larger than the size of the interleaver mxn, the excessive data symbols do not participate in interleaving, namely, the previous mxn data symbols are written into the interleaver; when the size of the data symbol NxL is smaller than or equal to the size of the interleaver m x N, the data symbol NxL participates in interleaving completely; the data symbols after the interleaver are:
rearranging the interleaved data symbols into a data matrix to be transmitted is as follows:
the obtained data matrix B K And the data of the excess part not participating in the interleaving is output to the pilot inserting step.
3. The time-domain interleaving-based 5G broadcast communication method as claimed in claim 2, wherein the obtaining of the symbol-level data stream after the modulation step includes:
the 5G broadcasting system transmits one frame which comprises a plurality of preset subframes, the time domain of each subframe is a preset value, each frame is divided into two half frames with equal size, one group of half frames are used for an uplink on one carrier, the other group of half frames are used for a downlink, various OFDM waveform parameters are supported, and the subcarrier interval of the subframes satisfies the condition that delta f is 2 μ ·15[kHz](ii) a Where μ represents a parameter value.
4. A 5G broadcast communication system based on time domain interleaving, comprising: a transmitting module and a receiving module;
the sending module comprises: the method comprises the steps that a bit sequence to be sent sequentially passes through a bit coding module and a modulation module to obtain a symbol-level data stream, the symbol-level data stream passes through a time domain interleaving module to obtain a data matrix, the data matrix sequentially passes through a pilot frequency insertion module, a fast Fourier inverse transformation module and a cyclic prefix insertion module to obtain frame data, and each frame data is transmitted to a receiving module through a channel;
the receiving module includes: each frame of data transmitted by a sending module through a channel sequentially passes through a cyclic prefix removing module, a Fourier transform module and a channel estimation and equalization module to obtain a symbol-level data stream, the obtained symbol-level data passes through a time domain de-interleaving module to obtain symbol data in sequence before an interleaving module, the obtained symbol-level data sequentially passes through a demodulation module and a bit decoding module to obtain bit data received by a receiving end, and 5G broadcast communication is completed;
the time domain de-interleaving module comprises: the data flow de-interleaving and pilot frequency insertion at symbol level after the channel estimation and equalization module are performed to obtain the estimated channel parameter de-interleaving;
and a symbol-level data stream de-interleaving is obtained after the channel estimation and equalization module: the symbol-level data flow expression obtained after channel estimation and equalization is as follows:
a symbol-level data stream C obtained after the channel estimation and equalization module k The following are arranged in sequence:
when the NxL of the data symbols is larger than the mxn size of the deinterleaver, the excessive data symbols do not participate in the deinterleaving, that is, the first mxn data symbols are written into the deinterleaver; when the NxL of the data symbols is smaller than or equal to the size of the de-interleaver m x N, the NxL of the data symbols all participate in interleaving;
the data symbols after the deinterleaver are:
rearranging the deinterleaved data symbols
And de-interleaving the channel parameters estimated by pilot insertion: the channel parameters to be estimated by pilot insertion are:
channel parameter H k The sequence is that:
a total of nxl channel parameters; writing the rearranged channel parameters J into a deinterleaver in sequence according to columns, and reading out the rearranged channel parameters J in sequence according to rows, wherein the deinterleaver is a matrix memory with the size of m multiplied by n;
when the number NxL of the channel parameters is larger than the size mxn of the de-interleaver, the excessive channel parameters do not participate in de-interleaving, namely only the first mxn channel parameters are written into the de-interleaver; when the number NxL of the channel parameters is less than or equal to the size of the de-interleaver m xn, the number NxL of the channel parameters all participate in interleaving;
the channel parameter after the de-interleaver is listed as:
rearranging the de-interleaved channel parameters
Demosaicing the rearranged deinterleaved data D k 、R k And the data and channel parameters of the multi-output part which does not participate in the de-interleaving are output to the demodulation module;
the column number n is expressed as:
wherein, T max Denotes the length of the largest code block, B max Representing the length of the check bit, and p represents the modulation order;
the expression of the number m of rows is:
wherein,
indicating a rounding operation where nxl 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: obtaining a symbol-level data stream after passing through a modulation module, wherein the data expression of one OFDM symbol is as follows: a is a k ＝[a k (1),a k (2),...,a k (L)] T (1) (ii) a Wherein L represents a length of data in one frame, k represents a user k, [ 2 ]] T Representing a transpose operation;
the number of the transmitting subframes of the 5G broadcasting system is M, the number of the OFDM symbols in each subframe is N, and a data matrix after the transmitting process is formed
Wherein
J data of the ith OFDM symbol; forming data of N OFDM symbols into data matrix A after transmission process k The following are arranged in sequence:
when the size of the data symbols NxL is larger than the size of the interleaver m x N, the excessive data symbols do not participate in interleaving, namely, the previous m x N data symbols are written into the interleaver; when the size of the data symbol NxL is smaller than or equal to the size of the interleaver m x N, the data symbol NxL participates in interleaving completely; the data symbols after the interleaver are:
rearranging the interleaved data symbols into a data matrix to be sent is as follows:
the obtained data matrix B K And the data of the outgoing part which does not participate in interleaving is output to the pilot insertion module.
6. The time-domain interleaving 5G broadcast communication system according to claim 5, wherein the obtaining of the symbol-level data stream after passing through the modulation module includes:
the 5G broadcasting system transmits one frame which comprises a plurality of preset subframes, the time domain of each subframe is a preset value, each frame is divided into two half frames with equal size, one group of half frames are used for an uplink on one carrier, the other group of half frames are used for a downlink, various OFDM waveform parameters are supported, and the subcarrier interval of the subframes satisfies the condition that delta f is 2 μ ·15[kHz](ii) a Where μ represents a parameter value.
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