基于CPM的双对角结构QC-LDPC码在水声信道的性能研究  

Performance of Dual Diagonal Structure QC-LDPC Codes Based on CPM in Underwater Acoustic Channels

作　　者：时相一 SHI Xiangyi(Key Laboratory of Sonar Technology,Hangzhou Institute of Applied Acoustic,Hangzhou 310012,China)

机构地区：[1]杭州应用声学研究所声纳技术重点实验室,浙江杭州310012

出　　处：《电声技术》2023年第3期36-38,47,共4页Audio Engineering

摘　　要：为提高水声通信系统的可靠性,提出一种基于循环置换矩阵(Circulent Permutation Matrix,CPM)的双对角结构准循环LDPC码(Quasi Cyclic-Low Density Parity Check,QC-LDPC)的构造方法。首先设计阈值满足要求的双对角结构QCLDPC码基矩阵,其次通过优化算法优化循环移位矩阵的循环移位系数,最后通过CPM方法构造出最终的双对角结构QC-LDPC码校验矩阵。仿真结果表明,通过该方法构造的QC-LDPC码相比于随机构造的QC-LDPC码有明显的性能提升,能够有效降低编译码复杂度,且在误码率降至10-5时无明显错误平层。In order to improve the reliability of underwater acoustic communication system,a construction method of Quasi Cyclic-LDPC(QC-LDPC)code with dual diagonal structure based on Circulent Permutation Matrix(CPM)is proposed.Firstly,the dual diagonal structure QC-LDPC code base matrix is designed,then the cyclic shift coefficient of the cyclic shift matrix is optimized by optimization algorithm,and finally the final dual diagonal structure QC-LDPC code check matrix is constructed by CPM method.The simulation results show that the QC-LDPC code constructed by this method has obvious performance improvement compared with the randomly constructed QC-LDPC code,which can effectively reduce the complexity of coding and decoding,and there is no obvious error level when the bit error rate drops to 1o-s.

关 键 词：双对角结构 准循环LDPC码(QC-LDPC) 水声通信 

分 类 号：TN929.3[电子电信—通信与信息系统] TN911.22[电子电信—信息与通信工程]