浅海水声信道中原模图LDPC码的设计及性能分析  

Design and Analysis of Protograph-based LDPC Codes in Shallow Water Acoustic Channels

作　　者：陈震华[1,2] 许肖梅[1] 陈友淦[1] 苏海涛[1] 

机构地区：[1]厦门大学水声通信与海洋信息技术教育部重点实验室,厦门361005 [2]桂林电子科技大学教学实践部,桂林541004

出　　处：《电子与信息学报》2016年第1期153-159,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(41176032;41376040;41476026);教育部高等学校博士学科点专项科研基金(20130121120033);中央高校基本科研业务费专项资金/厦门大学基础创新科研基金(20720140506)~~

摘　　要：原模图低密度奇偶校验码相较于传统LDPC码,具有结构简单、迭代译码门限低、易于扩展及线性编译码复杂度等优点。针对强多途、长时延、窄带宽的浅海水声信道,该文研究了PG-LDPC码的设计及性能特征,提出一种码型设计方案,并采用基于原模图度分布的外部信息转移图算法,对所设计PG-LDPC码的纠错性能进行分析及预测。仿真与实验结果表明,与(3,6)随机规则LDPC码相比,所提的PG-LDPC码在低、高信噪比区域均有良好的纠错性能。Proto Graph-based Low Density Parity Check（PG-LDPC） codes have many advantages over the conventional LDPC codes, such as simple structure, low iterative decoding threshold, easy extension and linear encoding/decoding complexity. After investigating the characteristics of PG-LDPC codes over the Shallow Water Acoustic（SWA） channels, which have the features of strong multipath interference, long delay spreading and limited bandwidth, a new design scheme to search for good codes is proposed. Furthermore, protographdegree-distribution-based EXtrinsic Information Transfer（EXIT） chart algorithm is used to predict and analyze the error performances of protograph-based LDPC codes. The simulation and experiment results show that the proposed code outperforms the（3, 6） randomly regular LDPC code in both low and high SNR region, over the SWA channels.

关 键 词：浅海水声通信 纠错码 原模图LDPC码 外部信息转移图算法 

分 类 号：TN929.3[电子电信—通信与信息系统]