文档介绍:
一种新的 LDPC码译码算法及其在 WIMAX
系统中的应用
李万臣,王茂朝*
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(哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨 150001)
摘要:LDPC 码的译码多为对数域和积(LLR-SP)译码算法。为了进一步降低译码复杂度
并相比最小和(Min-Sum)译码算法提高译码性能,本文在传统软判决译码算法基础上提出了
改进,基于 Normalized Min-Sum 译码算法,分析国外学者提出的校验节点匹配算法,成功
验证其译码性能之后,与 Normalized Min-Sum 译码算法相结合构建了称之为 NMS-DM 的新
算法,仿真结果表明这种新算法几乎接近性能优异的 LLR-SP 译码算法。最后,将这种
NMS-DM 译码新算法应用在 WIMAX 系统中,分析比较不同参数对 LDPC 码的影响,也进
一步证明了本文中提出的 MNMS-DM 译码新算法在 LDPC 码中有着很好的性能。
关键词:WIMAX 标准 LDPC 码;Normalized Min-Sum 算法;校验节点匹配算法
中图分类号:TN92
Application of a novel LDPC decoding algorithm in
WIMAX System
LI Wanchen, WANG Maozhao
(College of Information munication Engineering,Harbin Engineering University,Harbin
150001,China)
Abstract: LDPC codes using the LLR-SP algorithm order to reduce decoding
complexity and improve decoding pare with min-sum this paper
improvement proposed based on the traditional soft-decision decoding on
Normalied Min-sum decoding algorithm, by analyzing the foreign scholars proposed the
checksum node matching algorithm and verify its excellent the basis with the
Normalized Min-Sum decoding algorithms bined to build a new algorithm called
NMS-DM ,through the experimental data can indicate the decoding performance of the new
algorithm has improved greatly,almost close to the performance of the LLR-SP decoding
algorithm. Finally, t