基于删除方法构造码长固定的多速率LDPC码  

Expurgating-based Method for Constructing Multi-rate LDPC Codes with Constant Code Length

作　　者：穆锡金 白宝明[2] 贾倩[1] MU Xijin;BAI Baoming;JIA Qian(The 54th Reasearch Institute of CETC,Shijiazhuang 050081,China;State Key Lab.of Integrated Service Networks,Xidian Univ.,Xi＇an 710071,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《无线电通信技术》2018年第5期487-491,共5页Radio Communications Technology

基　　金：中国电科技术创新基金项目

摘　　要：多速率LDPC码是一组具有相同码长、不同码率的LDPC码,在实际系统中具有重要的作用。采用删除的方法构造了多速率LDPC码,其中低码率的码是在码长不变的前提下,通过减少高码率母码信息位数目得到的。与此同时,还利用LDPC码的叠加构造来整体设计所有码的校验矩阵。最终得到的码具有易于编译码器硬件实现的准循环结构,并且能够用校验矩阵直接编码。仿真结果表明,所构造的码在较大的码率范围内都具有较好的瀑布区和平层区性能。Multi-rate low-density parity-check（ MR-LDPC） codes are a group of LDPC codes with constant code length and different code rates,and play an important role in practical systems.In this paper,the MR-LDPC codes based on the expurgating method are constructed,where the low-rate codes are obtained by decreasing the number of data bits without changing the code length of highrate mother code.At the same time,the superposition construction of LDPC codes is applied to design the parity-check matrices of the proposed codes.The resulting codes own a quasi-cyclic structure,which are desirable for the hardware implementations of the encoder and decoder.The codes can also be directly encoded with the parity-check matrices.Simulation results show that the proposed codes can achieve good performance within a wide range of code rates both in the waterfall region and in the error-floor region.

关 键 词：LDPC码 多速率码 删除方法 叠加构造 

分 类 号：TN911.22[电子电信—通信与信息系统]