VAMP-Inspired Self-Iterative Adaptive Equalization for MIMO Underwater Acoustic Communications

被引:0
作者
Li, Dong [1 ,2 ,3 ]
Cui, Yingqiao [1 ,2 ,3 ]
Tao, Jun [4 ]
Wu, Yanbo [5 ]
Du, Pengyu [3 ]
机构
[1] Hangzhou Appl Acoust Res Inst, Hangzhou 310023, Peoples R China
[2] Sci & Technol Sonar Lab, Hangzhou 310023, Peoples R China
[3] HanJiang Natl Lab, Wuhan 430061, Peoples R China
[4] Southeast Univ, Sch Informat Sci & Engn, Minist Educ, Key Lab Underwater Acoust Signal Proc, Nanjing 210096, Peoples R China
[5] Chinese Acad Sci, Inst Acoust, Ocean Acoust Technol Lab, Beijing 100190, Peoples R China
来源
17TH ACM INTERNATIONAL CONFERENCE ON UNDERWATER NETWORKS & SYSTEMS, WUWNET 2023 | 2024年
基金
中国国家自然科学基金;
关键词
vector approximate message passing (VAMP); expectation propagation (EP); direct-adaptive turbo equalization; underwater acoustic communications; TURBO EQUALIZATION;
D O I
10.1145/3631726.3631753
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
The channel estimation (CE)-based vector approximate message passing (VAMP) soft equalizer (SE) has been proven to be an excellent technique of eliminating the inter-symbol interference (ISI) in single-carrier underwater acoustic (UWA) communications. It is attributed to the expectation propagation (EP)-like self-iterative mechanism between an inner soft slicer (ISS) and an inner soft equalizer (ISE). Inspired by that, we propose a direct-adaptive (DA) VAMP-SE for multiple-input multiple-input (MIMO) UWA communications in this pape. The proposed DA-VAMP-SE consist of the same ISS as the CE-VAMP-SE but a new ISE in form of DA-SE. For the new ISE, the extrinsic symbol knowledge is directly obtained via adaptive filtering instead of the EP-type message passing. The DA-VAMP-SE has the advantages of strong channel-tracking ability and low computational cost. Deep-sea experimental results showed that the proposed DA-VAMP-SE outperforms the CE-VAMP-SE and other typical SEs under fast time-varying UWA channels.
引用
收藏
页数:5
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