北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 1998, Vol. 21 ›› Issue (2): 51-55.

• 学术论文 • 上一篇    下一篇

多径异步DS/CDMA的串行最大似然检测

张武荣,吴伟陵   

  1. 北京邮电大学信息工程系, 北京 100876
  • 收稿日期:1997-05-19 出版日期:1998-03-10
  • 基金资助:
     

The Serial MLSE Multi-User Detection#br# of the Multi-Path Asynchronous DS/CDMA Signals

Zhang Wurong, Wu Weiling   

  1. Department of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876
  • Received:1997-05-19 Online:1998-03-10
  • Supported by:
     

摘要: 给出了多径异步多用户DS/CDMA系统的一种数学模型, 得出了恒参信道下最大似然检测(MLSE)算法的一种新的表示形式.具体分析了以Rake接收机作为信道匹配滤波器时, 最大似然检测器的算法设计问题.分析指出, 在多径环境下MLSE算法的复杂度和计算量与多径时延的分布有关, 如果用户时延扩散在一个信息码元之内, 算法复杂度和恒参信道下相同.该算法可以用状态数可变的Viterbi算法来实现.

关键词: 蜂窝移动通信, 码分多址联接, 多用户接收, 最大似然检测

Abstract: The Maximum Likelihood Sequential Estimation (MLSE)algorithm of a asynchronous DS/CDMA system over time invariant channel is investigated firstly, then the MLSE detector over multi-path fading channel is detailed.Analyses show the computational complexity of a MLSE detector over multi-path fading channel is determined by the delay spread.If the delay spread is within one information bit, the multi-path MLSE has a complexity of O(2k) which is the same of a MLSE algorithm over time invariant channel, while K is the number of users.The detector can be implemented by a dynamicprogramming algorithm such as Viterbi algorithm with variable state number.

Key words: cellular mobile communications, CDMA, multi-user detection, maximum likelihood sequential estimation

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