利用LDPC码度分布的QAM方案

doi:10.13190/jbupt.201001.89.xuchx

北京邮电大学学报 ›› 2010, Vol. 33 ›› Issue (1): 89-92.doi: 10.13190/jbupt.201001.89.xuchx

利用LDPC码度分布的QAM方案

许成鑫;常永宇;杨鸿文;张欣

（北京邮电大学信息与通信工程学院，北京 100876）

收稿日期:2009-04-20 修回日期:2009-10-14 出版日期:2010-02-28 发布日期:2010-02-28
通讯作者: 许成鑫

QAM Scheme Using Degree Distribution of LDPC Codes

XU Cheng-xin;CHANG Yong-yu;YANG Hong-wen;ZHANG Xin

(School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China)

Received:2009-04-20 Revised:2009-10-14 Online:2010-02-28 Published:2010-02-28
Contact: XU Cheng-xin

摘要/Abstract

摘要：

为改善通信质量，提高频谱效率，对非规则低密度奇偶校验(LDPC)码与高阶调制技术相结合进行研究，提出了一种简单而有效的结合方案. 该方案充分考虑了非规则LDPC码的度分布影响和高阶调制技术的不均等错误保护(UEP)特性. 在调制映射过程中，对不同度数的变量节点进行不同级别的保护. 利用高斯近似(GA)算法证明，该方案能提升系统性能. 仿真结果表明，本方案降低了系统出错率.

关键词: 非规则低密度奇偶校验码, 高阶调制, 度分布, 不均等错误保护, 高斯近似

Abstract:

In order to improve communication quality and promote spectral efficiency, a combination of irregular low-density parity-check (LDPC) codes and high order modulation technique is analyzed. A simple and efficient combination scheme is proposed, in which, the effect of degree distribution of irregular LDPC codes and the unequal error protection (UEP) property of high order modulation technique are considered. Different degree variable nodes have different protection levels during modulation mapping. It is proved that the system performance is promoted when using Gaussian approximation (GA) algorithm. Simulation shows that new scheme can reduce the system error rate.

Key words: irregular low-density parity-check codes, high order modulation, degree distribution, unequal error protection, Gaussian approximation

中图分类号:

TN911.22

许成鑫;常永宇;杨鸿文;张欣. 利用LDPC码度分布的QAM方案[J]. 北京邮电大学学报, 2010, 33(1): 89-92.

XU Cheng-xin;CHANG Yong-yu;YANG Hong-wen;ZHANG Xin. QAM Scheme Using Degree Distribution of LDPC Codes[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2010, 33(1): 89-92.

参考文献

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利用LDPC码度分布的QAM方案

QAM Scheme Using Degree Distribution of LDPC Codes

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