多径异步DS/CDMA的串行最大似然检测  

The Serial MLSE MultiUser Detection of the MultiPath Asynchronous DS/CDMA Signals

作　　者：张武荣[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程系

出　　处：《北京邮电大学学报》1998年第2期51-55,共5页Journal of Beijing University of Posts and Telecommunications

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．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(2k) 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 dynamic programming algorithm such as Viterbi algorithm with variable state number.

关 键 词：蜂窝移动通信 码分多址联接 最大似然检测 

分 类 号：TN929.5[电子电信—通信与信息系统]