重复累积码在协作分集系统中的应用研究  

Application of repeat-accumulate code in the cooperative system

作　　者：朱联祥[1] 李祥[1] 行彦辉[1] 代改荣[1] 王朝璋[1] 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2011年第1期16-20,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：信号与信息处理重庆市市级重点实验室建设项目(CSTC;2009CA2003);重庆市科委自然科学基金项目(CSTC;2008BB2087;CSTC;2009AB2088);重庆市教委自然科学基金项目(KJ080502)~~

摘　　要：由于重复累积(repeat accumulate,RA)码兼具LDPC(lowdensity parity code)码译码简单和Turbo码编码容易实现的优点,使其成为信道编码领域的一大研究热点。而编码协作作为一种将信道编码与协作分集系统相结合的工作方式,能同时为通信系统带来编码增益和分集增益。对协作分集系统进行了研究,提出了应用RA码的协作分集系统方案,通过2个不同用户在独立信道下发送码字的不同部分,实现虚拟分集技术。结果表明,RA码协作分集系统比未协作下的误码率要低,系统性能有显著提高。As the repeat accumulate code （ RA code） had the advantage of low density parity code （ LDPC ） and Turbo code. So it became a research focus in the field of channel coding. As a way to combine the channel coding with cooperative diversity system, the coded cooperation could bring both coding gain and diversity gain to the communication system. In this paper, the cooperative diversity system had been studied and a scheme was also proposed which applies RA code in cooperative diversity system. It could realize virtual diversity by two different users sending different parts of the code in separate channels. The result showed that the bit error rate in RA code cooperative diversity system was lower than that in the non-cooperative diversity system. So the performance of RA code cooperative diversity system had been significantly increased.

关 键 词：RA码 LDPC码 TURBO码 编码协作 

分 类 号：TN911.22[电子电信—通信与信息系统]