通信学报2025，Vol.46Issue(2)：72-82,11.DOI:10.11959/j.issn.1000-436x.2025029
基于多用户度分布优化的LDPC码构造方案
LDPC code construction scheme based on multi-user degree distribution optimization
摘要
Abstract
To design low-density parity-check(LDPC)codes with excellent performance in the multi-user related source scenario,the degree distribution optimization algorithm for LDPC codes in point-to-point channels was extended to the multi-user scenario,and based on this,a set of code construction schemes was developed.First,the iterative update infor-mation probability density function and external information transfer function were derived from the multi-user joint de-coding factor graph.Then,the mathematical optimization model was designed with the maximization of sum rate as the goal and the external information decoding convergence as the condition,the degree distribution parameters were ob-tained.Subsequently,based on these parameters and incorporating matrix optimization schemes such as algebraic cyclic shift values,cycle distribution,and minimum distance,a process for algebraically constructing quasi-cyclic LDPC codes was designed.To validate the effectiveness of the proposed scheme,the constructed codes were compared with existing multi-user constructed results across various scenarios.Simulation results show that the single-rate LDPC code has sig-nificant performance advantages,and the rate compatible LPDC(RC-LPDC)code extended from this framework not only outperforms existing schemes within a specific code rate range but also closely approaches the performance level of the single-rate construction.关键词
多用户度分布/准循环/速率兼容/低密度校验码Key words
multi-user degree distribution/quasi cycle/rate compatible/LDPC code分类
电子信息工程引用本文复制引用
关梦生,朱敏,白宝明,刘彤..基于多用户度分布优化的LDPC码构造方案[J].通信学报,2025,46(2):72-82,11.基金项目
国家自然科学基金资助项目(No.62271380,No.62171356) The National Natural Science Foundation of China(No.62271380,No.62171356) （No.62271380,No.62171356）
