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| 基于MMSE的大气激光通信中LDPC码BP译码算法研究 | |
| 引用本文： | 冷蛟锋,郝士琦,吕旭光,周建国,赵楠翔.基于MMSE的大气激光通信中LDPC码BP译码算法研究[J].光子学报,2014,41(3):277-282. |
| 作者姓名： | 冷蛟锋 郝士琦 吕旭光 周建国 赵楠翔 |
| 作者单位： | 1. 脉冲功率激光技术国家重点实验室(电子工程学院), 合肥 230037; 2. 安徽电子制约技术重点实验室, 合肥 230037 |
| 基金项目： | 国家自然科学基金(No.60902017)、安徽省自然科学基金(No.10040606Q60、No.10040606Q61)资助 |
| 摘 要： | 针对大气激光通信中低密度奇偶校验码(LDPC)置信传播(BP)译码算法复杂度高的问题,对几类BP-Based简化译码算法进行了分析,并基于最小均方误差准则(MMSE)对Scaled BP-Based和Offset BP-Based两类改进译码算法的优化设计进行了探讨,得出两类算法的最优校正因子,并给出了数值计算.在不同的湍流强度下,对码长1008的(6,3)比特填充LDPC码进行了仿真实验,结果表明,对于短码长的LDPC码,当译码BER=10-5时, 最小和算法(UMP BP-Based)相对于BP算法有0.1~0.15 dB的译码性能损失;基于MMSE设计的两类算法相比BP算法大大降低复杂度的同时,译码性能与BP算法相当,甚至优于BP算法,优于UMP BP-Based算法0.075~0.15 dB. |
| 关 键 词： | 大气激光通信 低密度奇偶校验码 最小均方误差准则 改进的置信度传播算法 |
| 收稿时间： | 2011-07-20 |
Optimization of Two BP-based Decoding Algorithms for LDPC Codes Based on MMSE Criterion under Weak Turbulence Channel |
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| LENG Jiao-feng,HAO Shi-qi,LV Xu-guang,ZHOU Jian-guo,ZHAO Nan-xiang.Optimization of Two BP-based Decoding Algorithms for LDPC Codes Based on MMSE Criterion under Weak Turbulence Channel[J].Acta Photonica Sinica,2014,41(3):277-282. | |
| Authors: | LENG Jiao-feng HAO Shi-qi LV Xu-guang ZHOU Jian-guo ZHAO Nan-xiang |
| Institution: | 1. State Key Laboratory of Pulsed Power Laser Technology(Electronic Engneering Institute), Hefei 230037, China; 2. Key Laboratory of Electronic Restriction, Anhui Province, Hefei 230037, China |
| Abstract: | Due to high complexity of Belief Propagation(BP) algorithm, several kind of BP-based simplified decoding algorithms are analyzed. Based on the Minimum Mean Square Erro(MMSE) criterion, optimal design of the scaled BP-based and offset BP-based algorithms is discussed. The theoretical formulas and numerical calculations on the optimal factors for these two BP-based algorithms are provdied. The simualtion resutls for the (6,3)regualr LDPC codes of lengths 1008 on the weak atmospheric turbulence channel demonstrate that the scaeld BP-based and offset BP-based aglorithms with the proposed factors are better than Min-Sum Algorithm, and even can achieve the performance better than that of the BP algorithm,and have lower complexity compared with BP algortihm. |
| Keywords: | Free space laser communication LDPC codes MMSE criterion Improved BP algorithms |
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