纠删信道中LDPC码EXIT曲线匹配设计  

EXIT Curve Fitting Design for LDPC Codes over BEC Channels

作　　者：郑慧娟[1] 

机构地区：[1]西安邮电学院电子与信息工程系,陕西西安710121

出　　处：《电子科技》2009年第9期56-58,共3页Electronic Science and Technology

摘　　要：基于单检码和重复码EXIT图面积特性的分析,介绍了在二元纠删信道中,采用EXIT曲线匹配设计LDPC码度分布序列的最佳性:当内外码的EXIT曲线完全匹配时,所设计的度分布序列对应的速率能够达到信道容量;而当内外码EXIT曲线之间有间隔时,所设计的度分布序列对应的速率严格小于信道容量,并且间隔面积越大,所损失的速率越大。Based on the analysis of the area property of the EXIT curves of single parity check codes and repetition codes, the optimality of EXIT curve fitting design of degree distributions for LDPC codes is explained. More precisely, when the EXIT curves of the inner codes and outer codes match, the designed degree distribution can approach the channel capacity; when there is a gap between the two curves, the designed degree distribution can not approach the capacity-the lager the area of the gap is, the larger the rate loss.

关 键 词：低密度奇偶校验码 外信息转移图 面积特性 

分 类 号：TN911.22[电子电信—通信与信息系统]