基于EXIT Chart的码率兼容LDPC码的构造  

Construction of rate-compatible LDPC codes based on EXIT Chart

作　　者：沈进旗[1] 俞晖[1] 徐友云[1] 

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《信息技术》2008年第7期55-57,共3页Information Technology

摘　　要：提出了一种码率兼容LDPC(Rate-Compatible LDPC,以下简称RC-LDPC)码的构造方法。通过该方法构造所得到的一个高码率LDPC码的校验矩阵(H矩阵)中所包含的其它低码率LD-PC码的度分布对都是通过码率兼容约束EXIT Chart优化得到。仿真结果表明这样优化得到的各个码率的LDPC码性能与采用普通的最优约束EXIT Chart优化所得到的LDPC码的性能接近。A novel method is proposed to construct rate-compatible LDPC （RC-LDPC） codes. One check matrix constructed by the proposed method contains several sub check matrices with different code rotes. The degree distribution of each sub code is optimized by EXIT Chart with rate-compatible constraint. It is found that the performance of each sub code is as the same as the code optimized by optimal EXIT Chart and construct independently.

关 键 词：低密度校验码 外信息转移图 码率兼容 打孔 边增长 

分 类 号：TN925[电子电信—通信与信息系统]