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An Equalization Method for Orthogonal Time-Frequency-Space Modulation with Low Computational Complexity

A technology of computational complexity and equalization method, applied in equalizers, multi-frequency code systems, etc., can solve the problems of not considering the reliability of feedback symbols, the influence of computational complexity channel models, etc.

Active Publication Date: 2020-10-02
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the former assumes perfect channel decoding feedback when performing sphere decoding, but it does not consider the reliability of the feedback symbols
The latter does not utilize channel decoding feedback, and the computational complexity is significantly affected by the channel model

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  • An Equalization Method for Orthogonal Time-Frequency-Space Modulation with Low Computational Complexity
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  • An Equalization Method for Orthogonal Time-Frequency-Space Modulation with Low Computational Complexity

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[0031] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation process and performance analysis of the method operation steps of the present invention will be further described in detail below in conjunction with the accompanying drawings and simulation examples.

[0032] see figure 1 , introduce the OTFS equalization method based on the linear minimum mean square error iterative parallel interference cancellation LMMSE-PIC of the present invention: the method uses the channel decoding feedback as the prior log likelihood ratio, and reconstructs the mean and diagonal covariance matrix of the soft symbols , and send it to the CWCU-LMMSE estimator to equalize the received signal on the delay-Doppler plane; finally, use the equalized external mean and external diagonal covariance to perform symbol-by-symbol Gaussian approximation, and output the external logarithm like Then the ratio is sent to the decoder, and the e...

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Abstract

The invention discloses an orthogonal time-frequency space OTFS modulation equalization method with low computational complexity, which is a method for equalizing interference between two-dimensionalcodes of an orthogonal time-frequency air conditioner under a time-frequency double-selection channel based on iterative parallel interference elimination of a linear minimum mean square error. The method can effectively utilize the covariance matrix of the reconstructed symbol to alleviate the influence of the interference between the residual two-dimensional codes on the OTFS system performance,so that the time-frequency two-dimensional gain can be better utilized, and the system reliability can be improved; time-frequency two-dimensional decomposition and octyl Fourier transform are adopted to carry out first-order Newman series approximation on the inverse matrix in LMMSE-PIC, so that the calculation complexity of the equalization method is reduced, and the equalization method only has a directrix relation with the total number of transmission symbols and is irrelevant to the channel sparsity, so that the system effectiveness is improved. The orthogonal time-frequency air conditioning system has the advantages that the time-frequency two-dimensional diversity gain of the orthogonal time-frequency air conditioning system can be remarkably improved under the time-frequency double-selection channel, the receiver performance of the non-ideal channel decoder during feedback is improved, and the popularization and application prospect is good.

Description

technical field [0001] The present invention relates to an equalization method of Orthogonal Time Frequency Space Modulation, to be precise, relates to a low complexity Orthogonal Time Frequency Space Modulation OTFS (Orthogonal Time Frequency Space Modulation) equalization method, which is used in time-frequency dual selection Under-channel delay-Doppler plane two-dimensional inter-code interference to equalize the influence of the orthogonal time-frequency space modulation system, so that the receiving end can obtain more time-frequency two-dimensional gain and realize reliable communication; it belongs to wireless The technical field of waveform modulation equalization method for communication. Background technique [0002] Orthogonal Time Frequency Space Modulation OTFS (Orthogonal Time Frequency Space Modulation) is a new modulation system for the physical layer of the fifth generation mobile communication system 5G (the fifthGeneration Communication System) proposed by...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/01
Inventor 牛凯董超龙非
Owner BEIJING UNIV OF POSTS & TELECOMM
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