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A OTFS Modulated Signal Detection Method Based on Maximum Ratio Merging in Transform Domain

A technology of signal detection and maximum ratio, applied in the direction of preventing/detecting errors through diversity reception, digital transmission system, preventing errors, etc., can solve problems such as performance degradation and communication rate reduction, achieve performance improvement, ensure communication rate, reduce effect of complexity

Active Publication Date: 2022-06-21
SOUTHEAST UNIV
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Problems solved by technology

But the disadvantage of this method is that in order to meet the special structure of the channel matrix, it is necessary to set the front part of the transmitted symbols to zero, which reduces the communication rate.
In addition, this algorithm does not take advantage of the expansion of the Doppler domain, and the performance will decrease as the Doppler expansion increases.

Method used

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  • A OTFS Modulated Signal Detection Method Based on Maximum Ratio Merging in Transform Domain
  • A OTFS Modulated Signal Detection Method Based on Maximum Ratio Merging in Transform Domain
  • A OTFS Modulated Signal Detection Method Based on Maximum Ratio Merging in Transform Domain

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Embodiment

[0181] In order to verify the performance advantage of the algorithm, an example flow of the present invention is given below.

[0182] (1) System simulation parameters

[0183] In this embodiment, the simulation parameters of the OTFS signal detection system based on transform domain maximum ratio combining are shown in Table 1. In addition, QPSK modulation is selected as the communication modulation method, and the complex gain of each path obeys a Gaussian distribution with a mean value of 0 and a variance of 1 / P, that is, The rest of the parameter settings are summarized in Table 1.

[0184] Table 1 OTFS transceiver system parameters

[0185]

[0186] (2) Analysis of bit error rate performance

[0187] image 3 Shows the variation curve of the bit error rate performance of the three algorithms with the signal-to-noise ratio, where the maximum relative velocity V of the transmitter and receiver max,c Fixed at 120km / h. according to image 3 , among the three algor...

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Abstract

The invention discloses an OTFS signal detection method based on the maximum ratio combination of the transform domain, which includes the following steps: step 1, constructing an effective channel matrix in the delay Doppler domain according to the path information of the channel; step 2, constructing according to the step 1 The correlation properties of the diagonalization of the circulant matrix in the matrix deduce the block-band structure of the effective channel matrix, and obtain the input-output relationship in the form of Doppler diversity; step 3, design a low-complexity transformation according to the structural characteristics of the effective channel matrix A domain maximum ratio combining algorithm, through which the estimated value of the transmitted symbols is obtained. The invention can solve the problem of high complexity in the existing OTFS signal detection method, significantly reduce the calculation complexity, and has better bit error rate performance.

Description

technical field [0001] The invention relates to an OTFS signal detection method based on transform domain maximum ratio combining, and belongs to the technical field of communication digital signal processing. Background technique [0002] Orthogonal time frequency space (OTFS) modulation, as an emerging two-dimensional modulation technology, has strong robustness to Doppler spread and is suitable for communication scenarios in 5G high-speed mobile environments. Unlike Orthogonal Frequency Division Multiplexing (OFDM) techniques, OTFS modulates information-carrying symbols in the delay-Doppler domain. OTFS modulation transforms a time-varying fading channel in the frequency-time domain into a constant-gain, time-independent channel in the delay-Doppler domain, so it is more robust to the time-varying characteristics of the channel. The symbol demodulation algorithm for OTFS is a hot research topic at present. [0003] Existing algorithms for OTFS symbol demodulation can be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/02
CPCH04L1/0052H04L1/0045H04L1/02
Inventor 刘升恒黄永明巩智含刘晨文
Owner SOUTHEAST UNIV
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