| 多元速率兼容LDPC码的自适应编码调制系统研究 |
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| 引用本文： | 周林,黄伟成,贺玉成,蔡灿辉.多元速率兼容LDPC码的自适应编码调制系统研究[J].信号处理,2015,31(7):815-822. |
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| 作者姓名： | 周林 黄伟成 贺玉成 蔡灿辉 |
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| 作者单位： | 华侨大学信息科学与工程学院厦门市移动多媒体通信重点实验室 |
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| 基金项目： | 国家自然科学基金青年项目（61302095，61201264）；福建省自然科学基金计划资助项目(2014J05076，2014J01243)；华侨大学科研基金(12BS219,13Y0384,13BS101) |
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| 摘 要： | 本文设计了一种基于有限域GF(q)上的多元速率兼容LDPC (RC-LDPC) 码结合高阶调制的自适应编码调制(Adaptive Coded Modulation, ACM) 系统。并提出了多元RC-LDPC码在独立和相关衰落信道下的增量冗余型自适应编码调制方案。本方案中多元LDPC码码率从1/3到5/6灵活变化，以较低的系统复杂度，有效提高了系统的频带利用率。仿真结果表明:随着系统吞吐率提高，多元ACM系统相对于二元ACM系统具有越来越明显的编码增益，最高可达约9 dB。
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| 关 键 词： | 多元LDPC码 速率兼容 自适应编码调制 高阶调制 |
| 收稿时间： | 2014-10-21 |
Adaptive Coded Modulation System Based on Non-binary Rate-compatible LDPC Codes |
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| Affiliation: | Xiamen Key Laboratory of Mobile Mutimedia Communications,College of Information Science and Engineering,Huaqiao UniversityThe State Key Lab. of ISN,Xidian University |
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| Abstract: | In this paper, high-order adaptive coded modulation (ACM) schemes based on non-binary rate-compatible (RC) LDPC codes over GF(q) were designed. Further, the incremental redundancy schemes of non-binary RC-LDPC-based ACM system over independent and correlative fading channels were proposed. In the proposed schemes, the LDPC encoder can provide a flexible code-rate range from 1/3 to 5/6 by shortening and puncturing algorithm. And the proposed schemes can improve the spectrum efficiency of system with little extra complexity. Simulations show that, with higher throughput rate, much more visible even 9 dB coding gain can be obtained by proposed non-binary ACM system than binary system. |
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