现代通信系统不规则LDPC系统码字构造方法  

Cycle free irregular-systemic LDPC codes construction in modern communication

作　　者：杨成恩[1] 陆荣[1] 吴斌[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《国外电子测量技术》2009年第8期21-24,共4页Foreign Electronic Measurement Technology

摘　　要：现代通信标准中广泛采用不规则LDPC系统码,在LDPC的校验矩阵中,低围长的还直接影响误码率性能。提出了一种基于硬件实现的消除矩阵短环的H矩阵构造方法,对环上子矩阵的偏移量进行循环更新。新的方法得到的矩阵和拥有相同形式的802.11n编码矩阵比较,有更小的平均列重,使得译码器存储空间减少了10%到15%,高斯信道下检测得到10%的性能优势。Irregular-systemic LDPC codes are prevalent in modern communication protocols, such as 802.11n, 802.16e and CMMB. But the low-girth cycles in H-matrix degrade the performance seriously. In this paper, a novel elimination measure is presented based on hardware implementation to design irregular-systemic LDPC H matrix, and the shift value of each sub-matrix can be updated in iterated algorithm. The LDPC codes of new H matrix require 10% to 15% less memory cost in hardware and have 15% performance improved through AWGN channel.

关 键 词：低密度校验码 消环 高斯信道 信道编码 

分 类 号：TN914[电子电信—通信与信息系统]