频选瑞利快衰落信道下的迭代多用户检测算法  

An Iterative Multi-user Detection Algorithm for Frequency-Selective Fast Rayleigh-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：《应用科学学报》2005年第3期245-250,共6页Journal of Applied Sciences

基　　金：国家863计划资助项目(2001AA123015)

摘　　要：针对频选快衰落信道,提出一种新的信道模型及相应的自适应信道跟踪算法;针对宽带DS CDMA系统上行链路,提出一种改进的部分并行干扰消除(PPIC)算法.PPIC算法在估计出的信道信息辅助下实现干扰抑制与多用户检测,同时将检测结果反馈至信道跟踪算法辅助实现自适应地估计时变信道,从而实现频选快衰落信道下DS CDMA系统上行链路的迭代多用户检测.数值仿真实验验证了本文算法的有效性.The multiaccess interference (MAI) and frequency-selective fast-fading of the channels do great harm to credible communication and greatly decrease the capacity of broadband wireless mobile communication systems under the working environment of high-speed vehicle holding. In this paper, a modified partial parallel interference cancellation (PPIC) method is proposed to combat MAI for the uplink of DS CDMA systems, and a new channel model and its corresponding channel tracing method are also proposed for frequency-selective fast-fading channels. An iterative multi-user detection algorithm for the uplink of DS CDMA systems over frequency-selective fast-fading channels is realized through the information exchange between the MPPIC and channel tracking. The simulation results validate the proposed algorithm.

关 键 词：快衰落信道 多用户检测算法 DS-CDMA系统 迭代多用户检测 瑞利 并行干扰消除 跟踪算法 上行链路 信道模型 干扰抑制 时变信道 检测结果 仿真实验 自适应 估计 宽带 反馈 

分 类 号：TN929.5[电子电信—通信与信息系统] TN914.5[电子电信—信息与通信工程]