非平稳相关多进制信源的分布式编码算法  

Distributed Coding Algorithm for Asymmetrical Correlated Non-binary Sources

作　　者：王尊亮[1] 李学俊[2] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876 [2]西南科技大学计算机科学与技术学院,绵阳621010

出　　处：《武汉理工大学学报》2009年第16期101-105,共5页Journal of Wuhan University of Technology

基　　金：北京市自然科学基金(4072019)

摘　　要：提出一种基于累积多进制LDPC码的分布式信源编码算法。该方法可以直接对相关的多进制信源进行分布式编码,从而避免了传统方法在将多进制转为二进制时造成的相关性减弱。另外该方法可对相关性非平稳的相关信源提供灵活可变的编码速率。实验结果表明在对非平稳相关多进制信源进行分布式编码时该方法优于传统的基于二进制LDPC的方法。A distributed coding algorithm based on the q-ary low-density parity-check accumulate （Q-LDPCA） codes is presented in this paper to solve the problem of coding two correlated non-binary sources with asymmetrical statistical dependency. On one hand the use of Q-LDPCA codes in the proposed system makes coding without converting non-binary sources to binary bits feasible, and thus it overcomes the reduction in correlation caused by conversion. On the other hand it makes coding rate varying adaptively with correlation of the correlated sources with asymmetrical statistical dependency. Experiment shows that the proposed system performs better than coding by binary LDPC code with conversion first.

关 键 词：分布式信源编码 WYNER-ZIV编码 戚码 

分 类 号：TN911.21[电子电信—通信与信息系统]