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| Rice信道下LDPC码译码粘滞点研究 | |
| 引用本文： | 徐华,徐澄圻. Rice信道下LDPC码译码粘滞点研究[J]. 南京邮电大学学报(自然科学版), 2007, 27(1): 6-10,19 |
| 作者姓名： | 徐华 徐澄圻 |
| 作者单位： | 南京邮电大学,通信与信息工程学院,江苏,南京,210003;南京邮电大学,通信与信息工程学院,江苏,南京,210003 |
| 摘 要： | LDPC码译码误比特率与迭代次数关系曲线及其粘滞点的研究,对于进一步深入分析译码机理和加快译码收敛的速度有着重要的意义.文章以Rice信道为研究背景,提出了一种采用基于offset BP_based译码算法的DDE分析结合差分进化技术的非正则LDPC码的优化方法,据此得出了Rice信道下最大比特节点次数为10、码率为1/2和1/3的优化次数分布对以及相应的码门限值;通过仿真得到了在Rice信道下LDPC码译码粘滞点分析的相关曲线,并从译码粘滞点角度研究了LDPC码的门限现象.通过对各阶节点的译码粘滞点分析结果表明,高阶节点相对于低阶节点而言,对于译码有较大贡献,据此提出了改进译码算法的两种思路. |
| 关 键 词： | LDPC码 Rice信道模型 离散密度进化 粘滞点 |
| 文章编号： | 1673-5439（2007）01-0006-05 |
| 收稿时间： | 2006-11-16 |
| 修稿时间： | 2006-11-16 |
Research of Fixed Point of LDPC Decoding over Rice Channel |
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| XU Hua,XU Cheng-qi. Research of Fixed Point of LDPC Decoding over Rice Channel[J]. JJournal of Nanjing University of Posts and Telecommunications, 2007, 27(1): 6-10,19 | |
| Authors: | XU Hua XU Cheng-qi |
| Affiliation: | College of Communication and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
| Abstract: | Research of the fixed point which appears in decoding process of LDPC codes is important to further analyze the decoding mechanism and speed up decoding convergence.Firstly,a new optimization scheme which combines DDE(Discrete Density Evolution)for offset BP-based decoding algorithm with differential evolution is presented for optimizing irregular LDPC codes.Then the optimized degree distribution pair and threshold of LDPC codes over Rice channel are given,with the maximum bit node degree 10 and code rate R=1/2,1/3.Furthermore,we analyze a series of simulated curves related to LDPC decoding fixed point and threshold phenomenon.Simulation results show that the node with higher degree contributes more to the decoding for LDPC codes.Therefore,we tentatively put forward two kinds of thinking to improve LDPC decoding algorithm. |
| Keywords: | LDPC codes Rice channel Discrete density evolution fixed point |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |