基于浅海水声信道的原模图LDPC码的设计与分析  

Design and analysis of protograph-based LDPC codes for shallow water acoustic channels

作　　者：肖旻[1] 张泽旺[1] XIAO Min;ZHANG Zewang(Department of Communication Engineering,Xiamen University of Technology,Xiamen 361005,P.R.China)

机构地区：[1]厦门理工学院通信工程系,厦门361005

出　　处：《重庆邮电大学学报（自然科学版）》2018年第4期492-497,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61202013)~~

摘　　要：针对浅海水声信道所带来的信号干扰和失真,研究了结构简单、纠错性能优秀、实现复杂度低的原模图(protograph-based low density parity check,PLDPC)码,发现在原模图中引入度为1的变量点以及均匀化基础矩阵行重这2种方法均可以提高PLDPC码在浅海水声信道下的性能,并在此基础上提出了新的PLDPC码设计准则。进而在浅海水声信道下,利用PEXIT(protograph extrinsic information transfer)理论分析方法,对基于不同设计准则的PLDPC码的门限值进行了分析。理论分析及系统仿真结果均表明,在所提出的准则约束下,设计出的PLDPC码在浅海水声信道下的性能优于传统PLDPC码。In order to solve the problems of signal interference and distortion introduced by shallow water acoustic channels,protograph-based low density parity check(PLDPC)codes are investigated,which provide simple structures,good error-correcting performances and low implementation complexity.It is found that adding variable nodes with degree-one into theprotographor uniformizing the row weight in the base matrixof a PLDPC codecan improve the performance.As a result,several novel criterions are proposed to guide the design of PLDPC codes.The thresholds of PLDPC codesbased on different criterions over shallow water acoustic channelsare analyzed by protograph extrinsic information transfer(PEXIT)method.Both theoretical analysis and simulation results show that the PLDPC codes designed under the constraintofthe proposed criterions outperform conventional PLDPC codes over shallow water acoustic channels.

关 键 词：浅海水声信道 原模图LDPC码 PEXIT方法 门限值 

分 类 号：TN911.22[电子电信—通信与信息系统]