CN108599901B - Wireless transmission method based on multi-phase space-time-like coding - Google Patents

Wireless transmission method based on multi-phase space-time-like coding Download PDF

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CN108599901B
CN108599901B CN201810299048.5A CN201810299048A CN108599901B CN 108599901 B CN108599901 B CN 108599901B CN 201810299048 A CN201810299048 A CN 201810299048A CN 108599901 B CN108599901 B CN 108599901B
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code words
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CN108599901A (en
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吴俊�
吴健
王睿
于威
赵卫东
方志军
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Tongji University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0631—Receiver arrangements

Abstract

The invention discloses a wireless transmission method based on multi-phase space-time-like coding, which utilizes the data similarity of pseudo-analog transmission among multiple antennas to obtain extra diversity gain in a multiplexing system. The method comprises the following steps: (1) the acquisition of the multi-similar data can be in a space domain or a frequency domain, and common application scenes comprise a multi-antenna heterogeneous scene, multi-channel video transmission and the like. (2) And constructing the multi-space-time-like coding code word at a transmitting end. (3) At the receiving end, the average difference value in the code words of the multi-space-like code words is predicted. By deciding whether the codeword would result in a similar performance gain. And (5) jumping to the step (4) if the judgment condition is met, or jumping to the step (5) if the judgment condition is not met. (4) And performing space-time decoding, and sending a decoding result to an LLSE (linear least square error) decoder. (5) The received data is sent to the LLSE decoder.

Description

Wireless transmission method based on multi-phase space-time-like coding
Technical Field
The present invention relates to a multiple-input multiple-output scheme in a wireless communication system, and more particularly, to a wireless transmission method based on multiple similar space-time codes.
Background
Multiple Input Multiple Output (MIMO) is a key technology in next generation wireless communication systems. The search for a compromise in diversity and multiplexing gain in conventional digital systems has matured. Soft transmission technology is receiving increasing attention because of its excellent performance in broadcast scenarios, but its diversity and multiplexing studies are still in the beginning. Due to the dense modulation characteristic of the soft transmission system, noise is directly superimposed on discrete cosine transform coefficients of a transmitted video source, and a great deal of similarity exists in transmitted data. In addition, under the soft transmission scene of multi-antenna heterogeneous or multi-path stereoscopic video transmission, the proposed more similarity utilization of the multi-description coding provides a reliable application scene.
Disclosure of Invention
The present invention is directed to a wireless transmission method based on multi-similar space-time coding, which overcomes the above-mentioned drawbacks of the prior art. The performance gain of the present invention is achieved by a method of constructing multiple similar codewords and an adaptive decoder. It has excellent performance in restoring transmitted multimedia signals, mainly images, video signals.
The purpose of the invention can be realized by the following technical scheme:
a multiple-input multiple-output scheme in a wireless communication system, the method comprising:
(1) the acquisition of the multi-similar data can be in a space domain or a frequency domain, and common application scenes comprise a multi-antenna heterogeneous scene, multi-channel video transmission and the like.
(11) Downsampling, constructing multiple descriptions of the source.
(12) Discrete cosine transform, decorrelation.
(13) And partitioning and performing power distribution.
Figure GDA0002621904160000011
Wherein N is the number of blocks, xiAre discrete cosine coefficients. giThe power is assigned a coefficient.
Figure GDA0002621904160000021
(2) And constructing the multi-space-time-like coding code word at a transmitting end.
(21) And selecting a reference space-time grouping code word according to the number of the transmitted and received antennas.
(22) In the referenced space-time block code word, the same code word is replaced by a similar code word, and in principle, the same row of code words is required to be obtained from one multi-similarity description.
(3) At the receiving end, the average difference value in the code words of the multi-space-like code words is predicted. By deciding whether the codeword would result in a similar performance gain. And (5) jumping to the step (4) if the judgment condition is met, or jumping to the step (5) if the judgment condition is not met.
(31) Estimating received noisy multi-space-time-like codewords by LLSE algorithm
Xllse＝ΛCT(CΛC+∑)-1Y
Wherein the parameters of the LLSE decoder are expressed as follows:
Figure GDA0002621904160000022
Yrfor a received noisy quasi-space-time coded codeword, giTo the power distribution coefficient, HrIs a channel gain matrix, λiAs source block energy, PsSNR is the signal-to-noise ratio for transmit power.
(32) And calculating the average difference value inside the noisy code words. R represents taking the real part of the complex number, and I represents taking the imaginary part of the complex number.
Figure GDA0002621904160000023
Indicating received X at the receiverllseEach value of the subsequent noisy codeword. i denotes the receive antenna dimension and j denotes the time dimension.
Figure GDA0002621904160000024
(33) The gain threshold is calculated by the receiver estimating the gain matrix of the channel at the receiving end.
P (n) is the channel noise power. H1 ═ H1_1H1_2) Specifically, the following are shown:
Figure GDA0002621904160000031
Figure GDA0002621904160000032
Figure GDA0002621904160000033
(34) and correcting the threshold value.
Figure GDA0002621904160000034
Figure GDA0002621904160000035
(35) And (4) judging by a decider, if the estimated noise of the multi-space-time-like coding code words is less than a threshold value, and otherwise, executing (5).
(4) And performing space-time decoding, and sending a decoding result to an LLSE (linear least square error) decoder.
(41) The input signal with noise passes through a space-time block code decoder.
Figure GDA0002621904160000036
Wherein the content of the first and second substances,
Figure GDA0002621904160000041
(42) and sending the decoding result to the LLSE decoder.
Figure GDA0002621904160000042
yc1,yc2For the output of the space-time block decoder, G is the diagonal matrix of power distribution coefficients, HhatIs a channel gain matrix.
(5) And sending the received data to a LLSE (linear least square error) decoder for video reconstruction.
(51) For the multi-phase space-time-like coded codeword which is judged by the decision device to not bring gain, the input parameters of the LLSE are as follows:
Figure GDA0002621904160000043
(52) for a multi-space-time-like coded codeword that is decided to bring gain, the input parameters of the LLSE are:
Figure GDA0002621904160000051
compared with the prior art, the invention has the following advantages:
1) the invention can effectively utilize the similarity inside the multi-similar code words to obtain higher information source reconstruction performance. Based on theoretical analysis of multi-similar space-time block code words, we prove that more efficient video decoding quality can be obtained by adaptively switching a space-time decoder and an LLSE decoder at a receiving end. The key point is to provide a similarity measurement method of multiple similar code words and a similarity threshold value capable of bringing performance gain.
2) Based on theoretical analysis, we propose a soft transmission framework applicable to wireless broadcast scenarios. The research of the system based on the soft transmission is just started, and has a plurality of problems needing research. The invention solves the problem of simply utilizing the space-time decoder in a multi-description scene. An efficient decoding scheme based on a switching mechanism is established. Compared to some conventional frameworks, the proposed system has a significant gain in peak signal-to-noise ratio (PSNR). The invention focuses on utilizing the internal redundancy of the multiple descriptions of the source and utilizes it to combat the channel noise. The design problem of the multi-input multi-output wireless transmission system solved by the invention is bound to promote the scheme to enter into practical application from theoretical research.
Drawings
FIG. 1 is a flow chart of a transmitting end and a receiving end of the present invention
FIG. 2 is a diagram of a length 2 polyphase space-time-like coded codeword constructed in the present invention compared with Alamounti code
Fig. 3 is a comparison of the average performance of video under different channel conditions in the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Fig. 1 is a flow chart of a transmitting end and a receiving end of the present invention. The specific implementation method comprises the following steps:
the acquisition of the multiple similar data in the step (1) can be performed in a space domain or a frequency domain, and common application scenes comprise a multi-antenna heterogeneous scene, multi-channel video transmission and the like.
Step (11) constructs 2 similar descriptions of the source by downsampling 1/2 the source video.
Step (12) uses discrete cosine transform to remove the correlation of each description.
Step (13) divides each source description into 64 blocks, and performs power distribution on a block basis, wherein the size of each block is 96 × 128 × 8.
Figure GDA0002621904160000061
Wherein N is the number of blocks, xiAre discrete cosine coefficients. giThe power is assigned a coefficient.
Figure GDA0002621904160000062
And (2) constructing a multi-similar space-time coding code word at a transmitting end.
Step (21) takes 2-transmission and 2-reception as an example, and selects the reference space-time block code word as an orthogonal alamouti code.
Step (22) replaces the same code word in the referenced space-time block code word with a similar code word, in principle, the same row of code words is required to be obtained from one multiple similar descriptions, and fig. 2 is a comparison diagram of the space-time coding code word and the multiple similar space-time coding code words.
And (3) predicting the average difference value inside the code words of the multi-similar space-time code words at a receiving end. By deciding whether the codeword would result in a similar performance gain. And (5) jumping to the step (4) if the judgment condition is met, or jumping to the step (5) if the judgment condition is not met.
Step (31) estimating the received noisy multi-space-time-like codeword by LLSE algorithm
Xllse＝ΛCT(CΛC+∑)-1Y
Wherein the content of the first and second substances,
Figure GDA0002621904160000071
Yrfor a received noisy quasi-space-time coded codeword, giTo the power distribution coefficient, HrIs a channel gain matrix, λiAs source block energy, PsSNR is the signal-to-noise ratio for transmit power.
And (32) calculating the average difference value inside the noisy code words. R represents taking the real part of the complex number, and I represents taking the imaginary part of the complex number.
Figure GDA0002621904160000072
Step (33) calculates a gain threshold by estimating a gain matrix of the channel at the receiving end by the receiver.
Figure GDA0002621904160000073
P (n) is the channel noise power. H1＝(H1_1H1_2) Specifically, the following are shown:
Figure GDA0002621904160000074
Figure GDA0002621904160000075
Figure GDA0002621904160000076
and (34) correcting the threshold value.
Figure GDA0002621904160000081
Figure GDA0002621904160000082
Wherein h isijThe value, σ, representing the ith row and jth column of the channel matrix H2Is the channel noise power. N is a radical oftxantIs the number of transmit-end antennas.
And (5) judging by a decision device, if the estimated noise of the multi-space-time-like coding code words is less than a threshold value, executing (4), otherwise, executing (5).
The wireless transmission method based on the multi-similar space-time coding is characterized in that the step (4) specifically comprises the following steps:
and (41) passing the input signal with noise through a space-time block code decoder.
Figure GDA0002621904160000083
Wherein the content of the first and second substances,
Figure GDA0002621904160000084
and (42) sending the decoding result to the LLSE decoder.
Figure GDA0002621904160000091
And (5) sending the received data to a LLSE (linear least square error) decoder to carry out video reconstruction.
Step (51) for the multi-space-time-like coded codeword which is judged by the decision device to be incapable of bringing gain, the input parameters of the LLSE are as follows:
Figure GDA0002621904160000092
step (52) for the multi-space-time-like coded codeword judged to be gain-capable, the input parameters of the LLSE are:
Figure GDA0002621904160000093
step (53) reconstructs the decoding result into a video signal, and the peak signal-to-noise ratio performance of the video signal and the source is shown in figure 3.
The above description is only a preferred example of the present invention, and the scope of the claims of the present invention is not limited thereto. The present invention is also directed to various embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (3)

1. A wireless transmission method based on multi-phase space-time-like coding is characterized in that extra diversity gain is obtained in a multiplexing system by utilizing the data similarity of pseudo-analog transmission among multiple antennas;
the method comprises the following steps:
(1) acquiring multi-similar data, namely in a space domain and a frequency domain, wherein an application scene comprises a multi-antenna heterogeneous scene and multi-path video transmission;
(2) constructing multi-similar space-time coding code words at a sending end;
(3) at a receiving end, predicting the average difference value in the code words of the multi-similar space-time code words; whether the code words bring multi-similarity performance gain or not is judged; if the judgment condition is met, jumping to the step (4), otherwise, jumping to the step (5);
(4) performing space-time decoding, and sending a decoding result to an LLSE decoder;
(5) sending the received data to an LLSE decoder;
the step (2) is specifically as follows:
(21) selecting a reference space-time block code word according to the number of the transmitted and received antennas;
(22) in the referenced space-time block code word, the same code word is replaced by a plurality of similar code words, and the code word of the same row is required to be obtained from a plurality of similar descriptions;
the step (3) is specifically as follows:
(31) estimating received noisy multi-space-time-like codewords by LLSE algorithm
Xllse＝ΛCT(CΛC+∑)-1Y，
Wherein the content of the first and second substances,
Figure FDA0002621904150000011
Yrfor a received noisy quasi-space-time coded codeword, giTo the power distribution coefficient, HrIs a channel gain matrix, λiAs source block energy, PsSNR is the signal-to-noise ratio for transmit power;
(32) calculating the average difference value inside the code word with noise, wherein R represents the real part of complex number, I represents the imaginary part of complex number,
Figure FDA0002621904150000012
indicating received X at the receiverllseEach value of the subsequent noisy codeword,irepresents the receive antenna dimension, j represents the time dimension;
Figure FDA0002621904150000021
(33) estimating a gain matrix of a channel at a receiving end through a receiver to calculate a gain threshold;
Figure FDA0002621904150000022
p (n) is the channel noise power; h1＝(H1_1H1_2) Specifically, the following are shown:
Figure FDA0002621904150000023
Figure FDA0002621904150000024
Figure FDA0002621904150000025
(34) correcting the threshold value;
Figure FDA0002621904150000026
Figure FDA0002621904150000027
wherein h isijThe value, σ, representing the ith row and jth column of the channel matrix H2Is the channel noise power, NtxantIs the number of transmit end antennas;
(35) and (4) judging by a decider, if the estimated noise of the multi-space-time-like coding code words is less than a threshold value, and otherwise, executing (5).
2. The wireless transmission method according to claim 1, wherein the step (4) is specifically as follows:
(41) the input signal with noise passes through a space-time block code decoder;
Figure FDA0002621904150000031
wherein the content of the first and second substances,
Figure FDA0002621904150000032
(42) and (3) feeding the decoding result into an LLSE decoder, wherein the input parameters of the decoder are expressed as follows:
Figure FDA0002621904150000033
yc1,yc2for the output of the space-time block decoder, G is the diagonal matrix of power distribution coefficients, HhatIs a channel gain matrix.
3. The wireless transmission method according to claim 1, wherein the step (5) is specifically as follows:
(51) multiple space-time-like coded codeword Y decided by decision device not to bring gainr_dissimThe input parameters of the LLSE decoder are:
Figure FDA0002621904150000041
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