交织分多址(IDMA)系统编码技术研究  

Coding in Interleave Division Multiple Access System

作　　者：张爱丽[1] 张新民[1] 李志勇[1] 

机构地区：[1]河南师范大学计算机与信息技术学院,河南新乡453007

出　　处：《广西师范大学学报（自然科学版）》2011年第4期63-67,共5页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(61040037)

摘　　要：交织分多址接入(IDMA)系统具有较强的抗多址干扰(MAI)的能力,且频谱利用率较高,该系统只有设计合理的多用户编码组合才能采用低复杂度的迭代检测算法。RA码是一种新型的纠错码,编译码简单,性能接近于香农限。结合适当的功率分配方案,将IDMA与重复累积RA编码技术相结合,仿真结果发现,该系统比目前已有的系统实现复杂度低,且性能与采用LDPC码接近,明显优于采用卷积码的IDMA系统。Interleave division multiple access （IDMA） system has strong anti-MAI ability and high spectrum efficiency. The low-complexity iterative detection algorithm is only used for well-designed multi-user code combinations in this system. Repeat accumulate （RA） code,a new error-correcting code,is simple in encoding and decoding and its performance is close to Shannon limit. IDMA and the RA codes are combined in this paper based on appropriate power allocation scheme. The simulation results showed that ,as the SNR increases,multi-user BER curves is gradually closed to the single-user,and it performs almost as well as LDPC-based IDMA,but much better than the system adopting convolutional codes.

关 键 词：交织多址 RA码 置信传播算法 迭代检测 

分 类 号：TN929[电子电信—通信与信息系统]