一种新的准随机LDPC卷积码及窗译码  

A New Quasi-Random LDPC Convolutional Codes and Window Decoding

作　　者：彭万权[1] 伍小兵[1] 张承畅[2] 冯文江[2] 

机构地区：[1]重庆工程职业技术学院电气工程学院,重庆400037 [2]重庆大学通信工程学院,重庆400044

出　　处：《电子学报》2014年第7期1379-1386,共8页Acta Electronica Sinica

基　　金：重庆市基础与前沿研究计划(No.cstc2013jcyjA40055);重庆市教委科学技术研究项目(No.KJ122003);中央高校基本科研业务费(No.CDJZR12160019)

摘　　要：以Gallager随机LDPC分组码为基础,通过列置换、置数、剪切与合并,构造了一种新的(l,3,6)准随机LDPC卷积码.针对该码类,提出了一种窗扇尺寸固定、滑动步长可选的窗译码算法,大幅降低了寄存器开销和译码延时.仿真实验界定了滑动步长的取值范围,验证了构造方案和窗译码的有效性,测试了不同约束度的准随机LDPC卷积码的误码性能,结果显示约束度l仅为1535即可获得距离香农限约1dB的纠错能力.Using column permutation,number setting,cutting and merging,a new（1,3,6）quasi-random LDPC convolutional codes is derived from GaUager LDPC block code.Aiming at this codes,the paper advances a windowed decoding, which the size of window sash is invariable and sliding step is optional, and it can considerably reduce the size of the register and decoding delay. The simulation defines the value range of sliding step and confirms the effectiveness of the construction method and windowed decoding, and also tests the BER performance of quasi-random LDPC convolutional codes with different constraint degrees. The results show that l = 1535 can obtain an error-correcting ability about 1 dB from the capacity limit.

关 键 词：卷积码 低密度校验码 时变周期卷积码 流水线译码 窗译码 

分 类 号：TN911.22[电子电信—通信与信息系统]