基于差集的低密度校验码的构造  

Construction of Low-Density Parity-Check codes based on difference sets.

作　　者：孙涛[1] 朱莉艳[1] 

机构地区：[1]扬州大学数学科学学院,江苏扬州225002

出　　处：《计算机工程与应用》2008年第7期168-170,216,共4页Computer Engineering and Applications

基　　金：国家自然科学基金(the National Natural Science Foundation of China under Grant No.60473018);江苏省自然科学基金(the Natural Science Foundation of Jiangsu Province of China under Grant No.BK2004051;No.BK2005207);东南大学移动通信国家重点实验室开放课题

摘　　要：组合设计是构造好的低密度校验码的潜在有力工具,提出了利用差集来构造准循环低密度校验码(QC-LDPC)的新方法。该方法构造的QC-LDPC码,最小环长至少为6,码率的选择也具有很大的灵活性。由于其准循环结构,可以用简单线性移位寄存器完成编码。计算机仿真结果表明该方法构造的QC-LDPC码,在加性高斯白噪声信道中BPSK调制下用和积迭代译码性能很好。Combinatoric design is a potentially powerful tool for constructing good LDPC codes.In this paper,a new approach to construct regular quasi-cyclic Low-Density Parity-Check （LDPC） codes based on the difference sets is proposed.The constructed LDPC codes is free of 4-cycles and with high flexibility in the choose of the code rate.Because of their quasi-cyclic structure, the encoding can be implemented with simple feedback shift register.Simulations show that the constructed quasi-cyclic LDPC codes with Sum-product iterative decoding perform well under BPSK modulation over an Additive White Gaussian Noise（AWGN） channel.

关 键 词：差集类 准循环低密度校验码 围长 和积译码 

分 类 号：TN911.22[电子电信—通信与信息系统]