基于M元循环移位的MIMO扩频深海水声通信方法

doi:10.12305/j.issn.1001-506X.2025.03.33

Abstract

Abstract:

To address the problem of low data rate and limited applicability of traditional spread spectrum communication systems in underwater networking, an efficient underwater acoustic communication method called multiple input multiple output M-ary cyclic shift keying (MIMO-MCSK) is proposed, which combines MCSK spread spectrum with MIMO communication systems. On the one hand, the MIMO-MCSK exploits the spatial multiplexing gain of MIMO systems and the information modulation dimension increased by MCSK encoding to significantly enhance the communication data rate. On the other hand, a frequency-domain phase conjugate energy detection algorithm is proposed at the receiver end to suppress inter-symbol interference and co-channel interference, and perform low complexity decode, verifying its superiority through simulation. In a deep water MIMO trial with two transmitters and eight receivers, low bit-error-rate underwater acoustic communication is achieved at communication distance of 10 km and 20 km with a data rate of 257.8 bps, validating the effectiveness and robustness of the proposed method.

Key words: spread spectrum underwater acoustic communication, M-ary cyclic shift keying, multiple input multiple output (MIMO), passive phase conjugation, frequency-domain energy detection

CLC Number:

TN929.3

Lin CHENG, Wei GE, Wei MEN. MIMO spread spectrum deep-sea underwater acoustic communication method based on M-ary cyclic shift keying[J]. Systems Engineering and Electronics, 2025, 47(3): 1010-1018.

Figures/Tables 16

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参数	阵列1	阵列2	阵列3
通信距离/km	10	10	20
布放深度/m	200	3 859	288
阵元间距/m	2	60	60

均衡处理方法	阵列1	阵列3
均衡前	0.107	0.18
单阵元均衡	0.086	0.135
8阵元均衡	3.6×10^-3	0

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MIMO spread spectrum deep-sea underwater acoustic communication method based on M-ary cyclic shift keying

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