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基于校验矩阵优化扩展的码率兼容LDPC码设计 被引量：1

Optimized extension of the parity-check matrix for rate-compatible LDPC codes
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摘要 为了提高低密度校验（low density parity check,LDPC）码的打孔性能,提出一种基于校验矩阵优化扩展的码率兼容LDPC码设计方法.从码率兼容码的度分布约束关系出发,提出母码的度分布优化算法.在此基础上,结合打孔变量点的译码恢复规则,构造适合打孔的LDPC码校验矩阵.采用贪婪搜索算法逐级最大化不同类型的打孔变量点数目,提高码率兼容系列子码的误码性能.仿真结果表明,与编码高效的码率兼容LDPC码相比,所提方法生成的码率兼容子码误码性能有较大改善,特别是当码率大于0.8时,编码增益提高约0.7～0.8 dB. In order to improve the puncturing performance of low density parity check （LDPC） codes, a method to optimize the extension of the parity-checking matrix for rate-compatible LDPC codes is proposed. Considering the rate compatible constraint, an algorithm is presented to optimize the degree distribution of the LDPC codes. Based on the recovery rules of punctured nodes, a new structure of the parity-check matrix is de- vised to facilitate puncturing. A greedy search algorithm is adopted to stepwisely maximize the number of diffe- rent types of punctured variable nodes, which results in good puncturing performance. The experiment results show that the proposed method is superior to the efficiently-encodable rate-compatible LDPC （E2RC-LDPC） codes over wide range of rates. When the rate is greater than 0. 8, the proposed method can obtain about 0.7-0. 8 dB gain over the E2RC-LDPC codes.
作者 陈紫强 欧阳缮 李民政 臧岚 肖海林
机构地区 西安电子科技大学电子工程学院 桂林电子科技大学认知无线电与信息处理省部共建教育部重点实验室
出处 《系统工程与电子技术》 EI CSCD 北大核心 2013年第9期1961-1965,共5页 Systems Engineering and Electronics
基金 国家自然科学基金(60972084 61162007 61102115 61261018 61261032) 广西自然科学基金项目(2013GXNSFFA019004) 广西无线宽带通信与信号处理重点实验室2011年度主任基金项目(11106 11104) 广西研究生教育创新计划(2011105950810M18)资助课题
关键词 低密度校验码 码率兼容 优化设计 打孔 low density parity check （LDPC） code rate compatible~ optimized design puncturing
分类号 TN911.22 [电子电信—通信与信息系统]
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参考文献14

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二级参考文献32

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系统工程与电子技术
2013年 第9期

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