基于卷积码的网络编码协助IDMA系统容量分析  

Capacity analysis of a convolutional code-based network coding assisted IDMA system

作　　者：张成磊[1] 周小林[1] 方朝曦[2] 

机构地区：[1]复旦大学通信科学与工程系,上海200433 [2]浙江万里学院电子信息学院,浙江宁波315100

出　　处：《信息与电子工程》2011年第5期531-536,共6页information and electronic engineering

基　　金：国家自然科学基金项目(60802011;60902007);国家科技重大专项"新一代宽带无线移动通信网"基金项目(2009ZX03002-003);浙江省自然科学基金项目(Y1101123);宁波市自然科学基金项目(2010A610173)

摘　　要：设计了一个由网络编码协作下的非正交用户合作系统,并引入了卷积码进行编码传输。中继用户处解码后的源用户有效数据通过线性网络编码组合在一起,传送到基站从而获得分集增益。在接收端,采用一种二重迭代多用户检测办法,并提出了新的接收机方案。采用一种码片级的算法性能评估技术"SNR evolution",对系统容量进行分析。对BER和系统容量的仿真分析表明:文中所讨论的合作机制是对付信道衰落的有效办法,它能够提供可观的用户合作分集增益,减少多用户系统的误码率;整个系统具有较高的系统容量。This paper designs a network-coded non-orthogonal multi-access user cooperative system,and convolutional code is employed to transfer messages.The source users＇ messages obtained in the relay where they get correctly decoded are XOR together and re-transmitted forward to the destination to obtain diversity gain.In the receiver,a dual iterative multi-user detection scheme is developed and the receiver architecture is redesigned.Besides,a novel performance evaluation technique for the chip-by-chip algorithm called SNR evolution technique is investigated to analyze the system capacity.Simulation results confirm that the proposed network-coded cooperation Interleave-Division Multiple-Access（IDMA） scheme based on convolutional code is an effective way to combat channel fading.It can provide obvious cooperation diversity gain and achieve noticeable Bit Error Rate（BER） improvement,and has a high system capacity.

关 键 词：非正交用户合作 卷积码 网络编码 迭代多用户检测 

分 类 号：TN911.2[电子电信—通信与信息系统]