Spatial and Time-Reversal Diversity Aided Least-Symbol-Error-Rate Turbo Receiver for Underwater Acoustic Communications

IEEE Access

Shefeng Yan¹  Lijun Xu¹  Fei Ji²  Xiaohui Zhong²  Fangjiong Chen²  Hua Yu² 

[1] Chinese Academy of Sciences, Institute of Acoustics, Beijing, China;School of Electronics and Information Engineering, South China University of Technology, Guangzhou, China;

关键词: Least symbol-error rate (LSER);    underwater acoustic communication;    decision feedback equalizer (DFE);    channel equalization;    turbo equalization;   

DOI  :  10.1109/ACCESS.2018.2805816

来源: DOAJ

【 摘 要 】

In this paper we propose a new type of receiver for underwater acoustic communication. The proposed receiver has the following features: 1) It has a turbo structure with an embedded adaptive decision feedback equalizer (DFE), which is based on the least-symbols-error-rate criterion and is shown to outperform the conventional minimum mean square error (MMSE) equalizers; 2) By exploiting the training symbol at the beginning and at the end of a data frame, the proposed receiver employs time-reversal equalization to suppress the error propagation of the applied DFE, where the time-reversal diversity gain is exploited by combing the output of the bidirectional DFE with an equal-gain combing scheme; and 3) A receiving array is applied, where the output of each hydrophone is individually equalized and then the equalizer outputs are combined with an equal-gain combing scheme. The proposed receiver is extensively evaluated through computer simulation and field experiments, and is also compared with the conventional MMSE based receiver in terms of the bit error rate performance.

【 授权许可】

Unknown