水声通信信源信道联合均衡译码方法  

Joint equalization and source-channel decoding algorithm for underwater acoustic communication

作　　者：胡承昊 王海斌[1] 台玉朋[1] 汪俊[1] HU Chenghao;WANG Haibin;TAI Yupeng;WANG Jun(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《哈尔滨工程大学学报》2020年第10期1530-1535,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(11674349).

摘　　要：为了提高水声通信的可靠性,本文利用信源冗余抵抗水声通信误码,提出了一种信源信道联合均衡译码方法。该方法在水声多途信道模型下综合信源转移概率和信道转移概率计算译码度量,在线性复杂度下实现了信源译码、信道译码和信道均衡的联合优化,显著提高了水声通信系统的可靠性。海试结果表明:与传统联合均衡译码方法相比,采用所提方法可有效降低通信系统的误码率:在深海会聚区条件下,对于速率225 bit/s通信信号,实测误码率由1.7×10^-1降低为0;在深海影区条件下,对于速率32.1 bit/s通信信号,实测误码率由1.1×10^-1降低为0;并且本文算法复杂度低,有利于实现实时通信,具有较高的应用价值。To improve the reliability of underwater acoustic communication,in this paper,we discuss a new approach that uses source redundancy for error control decoding of underwater acoustic communication,and we propose a joint equalization and source-channel decoding algorithm.The proposed algorithm can calculate the decoding metric by combining the source and channel transfer probabilities when the channel is modeled as an underwater acoustic multipath channel.This approach jointly optimizes source decoding,channel decoding,and channel equalization with linear complexity,and significantly improves the reliability of the underwater acoustic communication system.The sea trial results show that compared with the traditional joint equalization algorithm,the proposed algorithm effectively reduces the bit error rate.In the deep-sea convergence zone,the proposed algorithm reduces the bit error rate from 1.7×10^-1 to 0 at the rate of 225 bit/s and in the deep-sea shadow zone,it reduces the bit error rate from 1.1×10^-1 to 0 at the rate of 32.1 bit/s.In addition,the low complexity of the proposed algorithm is conducive to the realization of real-time communication,which gives it high application value.

关 键 词：水下通信 信源冗余 信源译码 信道译码 信道均衡 联合译码 通信可靠性 海上试验 

分 类 号：TN929.3[电子电信—通信与信息系统]