基于联合迭代译码的LDPC编码协作系统  

LDPC-Coded Cooperative System Based on Joint Iterative Decoding

作　　者：张顺外[1] 仰枫帆[1] 宗鹏[2] 

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京210016 [2]南京航空航天大学航天学院,江苏南京210016

出　　处：《西南交通大学学报》2011年第3期469-474,487,共7页Journal of Southwest Jiaotong University

基　　金：航空基金资助项目(20105552);东南大学移动通信国家重点实验室开放研究基金资助项目(200704);江苏省自然科学基金资助项目(BK2006188)

摘　　要：为提高系统性能,提出了分别采用正规LDPC(low-density parity-check code)和非正规系统LDPC码的编码协作通信系统,并给出了用于源节点和中继点的双LDPC码的构造方法.导出了基于双LDPC码的总体校验矩阵,据此校验矩阵给出了相应的双层结构Tanner图,目的点采用基于该双层结构Tanner图的联合迭代译码新算法译码.理论分析和数值模拟表明,在相同条件下,理想LDPC编码协作系统的性能明显优于编码非协作系统的性能,当误比特率为10-5、译码迭代10次时,理想正规LDPC码和非正规系统LDPC码编码协作系统较相应的编码非协作系统分别具有1.0和0.6 dB增益.In order to improve the performances of a communication system,new coded cooperative communication schemes employing regular LDPC（low-density parity-check code） and irregular systematic LDPC codes respectively were proposed,and the methods of constructing the double LDPC codes used by source and relay nodes were given.The overall parity-check matrix corresponding to the double LDPC codes was deduced,then the bilayer Tanner graph of the deduced parity-check matrix was given.A new joint iterative decoding algorithm based on the bilayer Tanner graph was used for decoding of the destination node.Theoretical analysis and simulation results show that the proposed ideal LDPC-coded cooperative schemes offer a significant performance gain over the coded non-cooperative scheme under the same conditions.Under the conditions of a BER（bit error rate） of 10-5 and 10 decoding iterations,the ideal regular LDPC and irregular systematic LDPC-coded cooperative schemes achieve respectively 1.0 and 0.6 dB gains over the coded non-cooperative scheme.

关 键 词：协作技术 LDPC码 双层Tanner图 联合迭代译码 

分 类 号：TN911[电子电信—通信与信息系统]