低信噪比多径下多天线联合时间同步算法

doi:10.12305/j.issn.1001-506X.2026.02.30

Abstract

Abstract:

In the low signal to noise ratio environment, in order to enable the communication system to determine the starting position of the signal and complete the subsequent signal processing, higher requirements have been put forward for the time synchronization performance of the system. And the multiple antenna technique can obtain diversity gain and array gain to improve the system performance in low signal to noise ratio environment. Based on this, a time synchronization algorithm based on coherent and incoherent joint processing of multiple receive antennas with multipath and low signal to noise ratio is proposed, where each receive antenna implements coherent merging to obtain coherent merging gain, and then incoherent merging is implemented between the antennas to eliminate the problem of phase difference between antennas, and to obtain multi-receive antenna gain. The effectiveness of the algorithm under different conditions is simulated and verified, including the comparison of synchronization performance with single antenna, the effect of judgment threshold on synchronization performance, the effect of different number of multipaths on synchronization performance, and the effect of channel correlation on synchronization performance. Simulation results show that the proposed algorithm significantly outperforms the single-antenna system. For a multiple input multiple output system with 16 sending and 16 receiving, the probability of correct time synchronization algorithm approaches 100% at a signal to noise ratio of ?39 dB, achieving high-precision time synchronization in multipath, low signal to noise ratio environments.

Key words: time synchronization, low signal to noise ratio, multi-antenna, multiple input multiple output

CLC Number:

TN 911

Changyu YI. Joint time synchronization algorithm for multiple antennas with low signal to noise ratio and multipath[J]. Systems Engineering and Electronics, 2026, 48(2): 705-710.

Figures/Tables 11

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References 20

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参数	数值
路径时延/s	$ \left[ {0,{\text{ }}0.35,{\text{ }}1.2,{\text{ }}1.6,{\text{ 4}}{\text{.8}},{\text{ }}6.3} \right] \times {10^{ - 6}} $
路径增益/dB	[−7.8486,−5.2914,−8.3129,−10.2687,−7.3283,−9.3327]

参数	数值
信号的采样率/MHz	0.6144
Chu序列的总个数	52
Chu序列的长度	1024
FFT点数	1024
信道类型	瑞利信道、高斯信道
收发天线数	16发16收
仿真数据量/帧	3000

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Joint time synchronization algorithm for multiple antennas with low signal to noise ratio and multipath

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