基于M元循环移位的MIMO扩频深海水声通信方法

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关键词：扩频水声通信；M元循环移位；多输入多输出；被动相位共轭；频域能量检测 中图分类号：TN929.3 文献标志码：A DOI：10.12305/j.issn.1001-506X.2025.03.33

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

CHENG Lin1，2，3，GE Wei1，2，3，4，*，MEN Wei5

.NationalKeyLaboratoryofUnderwaterAcousticTechnology，HarbinEngineeringUniversity，Harbin15ol，China 2.KeyLaboratory for Polar Acoustics and Application of Ministryof Education，Harbin 150o01，China; 3.Collegeof Underwater Acoustic Engineering，Harbin Engineering Uniuersity，Harbin15oool，China； 4.StateKey LaboratoryofAcoustics Instituteof Acoustics，ChineseAcademyof Sciences，Beijing 10ol90，China; 5.Department of Electronic Engineering，Tsinghua University，Beijing lOo084，China）

Abstract：To address the problem of lowdata rate and limited applicability of traditional spread spectrum communication systems in underwater networking，an eficient 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 systemsand the information modulation dimension increased by MCSK encoding to significantly enhance the communication data rate.On the other hand，a frequency-domain phase conjugateenergy 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 transmiters and eight receivers，low bit-eror-rate underwater acoustic communication is achieved at communication distance of 10km and 20km with a data rate of 257.8 bps， validating the effectiveness and robustness of the proposed method.

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

0 引言

水声信道是公认的难度最大的无线信道之一[1]，尤其在深海环境下，传播损失、多途干扰等问题更为严重，使得水下组网的稳健通信面临着巨大挑战。（剩余14650字）