应用科学学报 ›› 2009, Vol. 27 ›› Issue (5): 463-467.

• 通信工程 • 上一篇    下一篇

协同CDMA小波联合检测器

彭章友;林杰;刘艳艳   

  1. 上海大学通信与信息工程学院,上海200072
  • 收稿日期:2009-07-10 修回日期:2009-09-09 出版日期:2009-09-25 发布日期:2009-09-25
  • 通信作者: 彭章友,博士生,副教授,研究方向:通信信号处理,E-mail: zypeng@mail.shu.edu.cn
  • 基金资助:
    国家自然科学基金(No.60872114)资助项目

Wavelet Joint Detector in Cooperative CDMA System

  1. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
  • Received:2009-07-10 Revised:2009-09-09 Online:2009-09-25 Published:2009-09-25

摘要:

提出一种基于协同CDMA的小波多用户检测器,来降低多址干扰对CDMA系统性能的影响. 研究了一种协同时分双工CDMA模型,并结合小波的多分辨率分析建立了协同CDMA小波多用户检测器的模型. 根据最小均方误差线性多用户检测器的要求,通过理论分析提出一种减小代价函数的最小均方误差多用户联合检测器算法,并分析了所提出的小波多用户联合检测器在协同直接序列码分多址系统中的误码率传输特性. 计算机仿真结果表明:在平坦瑞利衰落信道下,提出的小波多用户检测器能有效能降低多址干扰的影响,提高系统容量,在低信噪比情况下效果尤为显著.

关键词: 协同, 直接序列码分多址, 最小均方误差, 多分辨率分析, 多用户检测

Abstract:

This paper proposes a wavelet multi-user detector to reduce the influence of multiple access interference
(MAI) in CDMA systems. Based on the cooperative time-division duplex CDMA (TDD-CDMA) model combined
with a wavelet multi-resolution analysis, we establish a wavelet multi-user detector model for cooperative CDMA
systems. According to the requirement of MMSE multi-user detector, we propose a joint MMSE multi-user detector (MUD) which can reduce the cost function. By theoretical analysis, a closed-from expression of bit error rateperformance is derived. Simulation results show that the proposed wavelet multi-user detector can effectively suppressMAI and increase system capacity, especially at low SNR.

Key words: cooperation, DS-CDMA, MMSE, multi-resolution analysis, multi-user detection (MUD)

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