一种LDPC码的优化分层阈值偏移最小和译码算法  

An Improved Layered Threshold Offset Min-Sum Decoding Algorithm for LDPC Codes

作　　者：袁建国[1] 张育宁 王姿现 庞宇[1] YUAN Jianguo;ZHANG Yuning;WANG Zixian;PANG Yu(School of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院,重庆400065

出　　处：《电讯技术》2024年第9期1415-1419,共5页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(U21A20447,61971079)。

摘　　要：针对低密度奇偶校验(Low-Density Parity-Check,LDPC)码的译码算法在高信噪比区域性能较差和传统的泛洪调度译码方式收敛速度较慢等问题,提出了一种优化的分层阈值偏移最小和(Improved Layered Threshold Offset Min-Sum,ILTOMS)LDPC译码算法。该算法通过在最小值近零处添加一个阈值,在最小值小于该阈值的情况下选择局部最优的算法规避偏移最小和(Offset Min-Sum,OMS)译码算法的归零损失,在最小值较大时设置一个阈值来改善高信噪比时的译码性能,并且采用分层调度的方式进一步提高译码性能。仿真结果表明,所提的ILTOMS译码算法在复杂度无明显变化的情况下有一定性能增益,相比其他两种译码算法译码性能分别提升了0.4 dB和0.45 dB。In order to improve the poor performance of decoding algorithms for low-density parity-check(LDPC)codes in high signal-to-noise ratio(SNR)regions and the slow convergence speed of traditional flood scheduling decoding methods,an improved layered threshold offset min-sum(ILTOMS)LDPC decoding algorithm is proposed.This algorithm avoids the zeroing loss of the Offset Min-Sum(OMS)decoding algorithm by adding a threshold near the minimum value and selecting the locally optimal algorithm when the minimum value is less than this threshold.When the minimum value is large,a threshold is set to improve the decoding performance at high SNR,and a hierarchical scheduling approach is adopted to further improve the decoding performance.The simulation results show that the proposed ILTOMS decoding algorithm has a certain performance gain without obvious changes of complexity,and the decoding performance is improved by 0.4 dB and 0.45 dB respectively compared with that of the other two decoding algorithms.

关 键 词：低密度奇偶校验码 泛洪调度 分层调度 偏移最小和算法 

分 类 号：TN911.22[电子电信—通信与信息系统]