浅海水声通信中非规则LDPC码的构造、优化和应用研究

项目名称： 浅海水声通信中非规则LDPC码的构造、优化和应用研究

项目编号： No.41276038

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 刘胜兴

作者单位： 厦门大学

项目金额： 65万元

中文摘要： 时变强多途干扰是浅海水声信道数据可靠传输的主要障碍，也是目前水声相干通信迫切需要解决的关键技术问题之一。针对该问题对浅海水声信道自适应均衡、非规则LDPC码的构造、优化和应用，以及两者的级连、迭代运算等展开深入研究；采用密度进化算法分析浅海水声信道中LDPC码的译码阈值，搜索最优度分布函数对，PEG方法构造相应非规则LDPC码；研究校验矩阵H的结构、译码算法、级连模式、码长和信道自适应参数等对所构造非规则LDPC码性能的影响机制；构建Turbo-LDPC码，分析其在浅海水声信道中的译码性能并将其与传统Turbo码、LDPC码进行比较；DSP软件方法实现LDPC码的实时编译码；基于DSP成功研制一套高速水声相干通信实验样机，实现通信距离5~8km，传输速率5kbits/s，系统误比特率小于10-5的通信性能。本项目的顺利实施有望为海洋方面的科研和生产活动提供一种高新技术支持。

中文关键词： 水声通信；非规则LDPC码；浅海水声信道；自适应信道均衡；多途干扰

英文摘要： Time-varying strong multipath interference is the major obstacle to a reliable data transfer in shallow water acoustic channels, which is also one of the key problems that should to be solved urgently in coherent underwater acoustic communications. The adaptive equalization for shallow water acoustic channels and the construction, optimization and implementation of irregular LDPC codes will be deeply investigated in this project. Moreover, the cascade and iterative computation of the equalization and the irregular LDPC codes will be investigated. The decoder threshold of LDPC codes will be analyzed and its optimal degree distribution for shallow water acoustic channels will be searched by using the density evolution algorithm. The corresponding irregular LDPC codes will be constructed by using progressive edge growth (PEG) method. The effects of structure of parity matrix H, decoder algorithm, cascade mode, code length, and parameters of channel adaptive equalization on the performances of the constructed irregular LDPC codes will be investigated. A Turbo-LDPC code will be constructed and its decoder performance in shallow water acoustic channels will be investigated. In addition, the new code will be compared with the conventional Turbo code and LDPC code. The real-time coding and decoding of the constructed ir

英文关键词： Underwater acoustic communication；irregular LDPC codes；shallow water acoustic channel；adaptive channel equalization；multi-path interference