H-ARQ信道上全分集LDPC码的构造与密度演化分析  

Full diversity LDPC codes construction and density evolution analysis for H-ARQ Channels

作　　者：郭锐[1] 胡方宁[1] 刘济林[2] 

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018 [2]浙江大学信息与电子工程系,杭州310027

出　　处：《中国科学：信息科学》2012年第8期974-987,共14页Scientia Sinica(Informationis)

基　　金：国家自然科学基金(批准号:60972049);浙江省自然科学基金(批准号:Y1100579)资助项目

摘　　要：本文研究了混合自动重传(hybrid auto matic repeat request,H-ARQ)信道上全分集低密度奇偶校验(low density parity check,LDPC)码的构造与性能.首先分析了H-ARQ信道的中断概率及其固有分集,然后构造了在H-ARQ信道上能取得全分集的LDPC码,新构造的码字采用根校验节点把原始传输与重传联系起来,从而获得全分集.接着,给出了所构造码字的密度演化过程、度的优化以及误字率(WER)性能.仿真结果表明,本文所提算法不仅能取得全分集,而且具有优异的性能.In wireless scenarios, an effective protocol to increase the reliability for time-varying channels is the hybrid automatic repeat request （H-ARQ）. In order to improve the performance of communication system with H-ARQ, a kind of full diversity low density parity check （LDPC） on H-ARQ channels was proposed. The new proposed LDPC codes connect the initial transmission with the repeated transmissions by root-connection to get extern diversity gain. In addition, the density evolution process was given. Simulation results show that the proposed algorithm can not only achieve full diversity, but also get better performance than constructed LDPC codes at present.

关 键 词：混合自动重传 低密度奇偶校验码 分集增益 编码增益 全分集 信道编码 分集 增益控制 

分 类 号：TN911.2[电子电信—通信与信息系统]