| 摘要: |
| 利用变量节点符号可靠度在迭代过程中的分布特征，提出了一种基于可靠度差值特征的自适应判决多元低密度奇偶校验（Low Density Parity Check,LDPC)译码算法。整个迭代过程划分为两个阶段，针对不同阶段节点可靠度的差值特征分别采用不同的判决策略:前期阶段，采用传统的基于最大可靠度的判决策略；后期阶段，根据最大、次大可靠度之间的差值特征，设计自适应的码元符号判决策略。仿真结果表明，所提算法在相当的译码复杂度前提下，能获得0.15~0.4 dB的性能增益。同时，对于列重较小的LDPC码，具有更低的译码错误平层。 |
| 关键词: 多元LDPC码；大数逻辑译码；自适应判决 差值特征 |
| DOI：10.20079/j.issn.1001-893x.230412008 |
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| 基金项目:国家自然科学基金资助项目（61961004,62261003,62361003）；广西无线宽带通信与信号处理重点实验室基金资助项目（GXKL06240206） |
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| A Decoding Algorithm for Nonbinary LDPC Codes with Adaptive Decision Based on Reliability-ifference Feature |
| SUN Youming,WEI Lile,HUANG Yijun,MO Lixin,LI Xiangcheng,SUN Hongmin |
| (1.School of Computer,Electronics and Information,Guangxi University,Nanning 530004,China;2.Guangxi Wireless Broadband Communication and Signal Processing Key Laboratory ,Guilin University of Electronic Technology,Guilin 541004,China;3.Guangxi Vocational & Technical Institute of Industry,Nanning 530001,China) |
| Abstract: |
| By utilizing the distribution of the reliability among the variable nodes,a decoding algorithm for non-inary low density parity check(LDPC) codes with adaptive decision based on reliability-ifference feature is proposed.The iterative procedure is divided into two stages according to the reliability-ifference and each stage employs a different decision strategy.For the early stage,the conventional largest-eliability based decision is used;while for the later stage,an adaptive symbol decision strategy is designed based on the difference between the largest and the second-argest reliability values.Simulation results show that the proposed algorithm can achieve 0.15~0.4 dB performance gain while maintaining a comparable decoding complexity.Furthermore,the algorithm shows a lower error-loor,especially for low-olumn-eight codes. |
| Key words: non-inary low density parity check codes(NB-DPC) majority-ogic decoding adaptive decision difference feature |
