| 利用LDPC码度分布的QAM方案 |
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| 引用本文： | 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. |
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| 作者姓名： | 许成鑫 常永宇 杨鸿文 张欣 |
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| 作者单位： | 北京邮电大学,信息与通信工程学院,北京,100876;北京邮电大学,信息与通信工程学院,北京,100876;北京邮电大学,信息与通信工程学院,北京,100876;北京邮电大学,信息与通信工程学院,北京,100876 |
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| 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.
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| 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 |
| 收稿时间： | 2009-4-20 |
| 修稿时间： | 2009-10-14 |
QAM Scheme Using Degree Distribution of LDPC Codes |
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| 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 Telecommunications,2010,33(1):89-92. |
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| Authors: | XU Cheng-xin CHANG Yong-yu YANG Hong-wen ZHANG Xin |
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| Affiliation: | (School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China) |
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| Abstract: | In order to improve communication quality and promote spectral efficiency, the combination of irregular low-density parity-check (LDPC) codes and high order modulation technique was 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 using Gaussian approximation (GA) algorithm. Simulation results show that new scheme can reduce the system error rate. |
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| Keywords: | irregular LDPC codes high order modulation degree distribution unequal error protection Gaussian approximation |
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