电子学报2017，Vol.45Issue(1)：16-21,6.DOI:10.3969/j.issn.0372-2112.2017.01.003
瑞利信道下基于广义阈值函数的LDPC译码算法
LDPC Decoding Algorithm with Generalized Threshold-Function over Rayleigh Fading Channel
摘要
Abstract
There exist two criterions for the existing LDPC decoding algorithms at node-processing,majority-logic processing and fully processing.The algorithms can't make flexible tradeoffs between performance and complexity,since their threshold parameters are usually set to be unvaried.This paper first presents a generalized threshold-function,which can apply to most of the existing binary LDPC decoding algorithms to control the participating-nodes in the iterations by adjusting the threshold parameters.Then a new non-uniform quantization decoding algorithm combined with syndrome and constellation mapping information is presented,which can further reduce the complexity and memory load.Simulation results show that the presented algorithm can obtain excellent decoding performances with very low quantization level over the Rayleigh fading channel.Furthermore,it is shown that only 30％ variable nodes are involved in the iterations when combined with the presented threshold-function,which can remarkably reduce the complexity.关键词
LDPC码/阈值函数/迭代译码/译码复杂度/非均匀量化Key words
LDPC code/threshold-function/iterative decoding/decoding complexity/non-uniform quantization分类
信息技术与安全科学引用本文复制引用
陈海强,梁奇,黎相成,孙友明,覃团发,李道丰..瑞利信道下基于广义阈值函数的LDPC译码算法[J].电子学报,2017,45(1):16-21,6.基金项目
国家自然科学基金(No.61102090,No.61261023,No.61362010) （No.61102090,No.61261023,No.61362010）
广西自然科学基金(No.2012GXNSFAA053217,No.2014GXNSFBA118276) （No.2012GXNSFAA053217,No.2014GXNSFBA118276）
