一种频选衰落信道下的Turbo多用户检测算法  

Turbo multiuser detection for uplink of CDMA systemsover frequency-selective fading channels

作　　者：彭岳星[1] 吴镇扬[1] 王维新[1] 刘陈[1] 

机构地区：[1]东南大学无线电工程系,江苏南京210096

出　　处：《电波科学学报》2005年第3期367-372,共6页Chinese Journal of Radio Science

基　　金：国家高科技发展计划资助项目(2001AA123015)

摘　　要：联合MAP多用户检测与信道解码的迭代多用户检测(MUD)技术可显著提高宽带移动CDMA系统的容量和性能。在多径时变衰落的编码信道下,提出一种迭代实现干扰抑制、符号估计、信道解码的Turbo多用户检测算法。在每次迭代中,MUD自适应地实现干扰抑制并输出符号估计的软信息,软输入软输出的信道解码器使用LOGMAP方法实现信道解码并反馈符号估计的软信息作为下一次TurboMUD迭代的先验信息。仿真结果证实了该算法在频选衰落信道下经两次迭代就能逼近单用户编码CDMA系统的接收性能。The technique combining MAP-based multi-user detection (MUD) with channel decoding can greatly improve performance and capacity of broadband CDMA mobile communication systems. A new method of Turbo MUD is proposed for the uplink of CDMA systems over frequency-selective time-varying fading coded channels, which iteratively performs interference cancellation, symbol estimation and channel decoding. At every iteration, LMS based MUD adaptively restrains interference and jointly detects symbols, the soft information of estimated symbols are transferred to channel decoders. Soft-in soft-out channel decoders feedback the estimated symbols as a prior information to LMS based MUD. Simulation results show that the proposed method can approach the performance of a single user coded CDMA system over frequency-selective fading channels after two iterations.

关 键 词：码分多址 用户检测 部分并行干扰消除 信道解码 

分 类 号：TN929.533[电子电信—通信与信息系统]