MC-DS/CDMA系统中最小均方误差检测器  

Minimum mean square error detection in MC-DS/CDMA

作　　者：王艺[1] 张忠培[1] 姚彦[1] 

机构地区：[1]清华大学电子工程系

出　　处：《清华大学学报（自然科学版）》2002年第7期985-988,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目 (6983 10 3 0 )

摘　　要：如何抑制多址干扰 ,同时降低实现复杂度 ,是研究MC- DS/ CDMA系统的关键之一。论文在已有的联合最小均方误差 (MMSE)检测器的基础上 ,提出了两种基于单载波的MMSE检测器结构 ,即 MMSE- MRC结构和 MMSE- MMSE结构 ,比较了几种接收机的性能。仿真表明 :MMSE- MRC和 MMSE- EGC的性能与传统的解扩— MRC结构相近 ,不能有效地抑制多址干扰。当载波数较小或较大时 ,MMSE-MMSE的性能接近联合 MMSE检测器 ,而计算量只有O(N3/ M2 +M3) ,远小于联合 MMSE检测器的计算量 ,有利于工程实现。Multicarrier direct sequence code division multiple access (MC DS/CDMA) need to suppress multiple access interference while decreasing system complexity. A system with two carrier based MMSE receivers is proposed to replace the existing joint minimum mean square error (MMSE) detection method which is computationally complex. Simulations of the performances of different receivers show that MMSE MRC and MMSE EGC receivers are similar to the traditional despreading MRC receiver in that they can not efficiently suppress multiple access interference. However, in case of large of small number of carriers, the MMSE MMSE receiver performance approaches that of a joint MMSE receiver but with a computational complexity of only O(N 3/M 2+M 3) , which is much less than that of a joint MMSE receiver.

关 键 词：MC-DS/CDMA系统 最小均方误差检测器 多址干扰 多载波直扩码分多址 MMSE-MRC结构 接收机 MMSE-MMSE结构 

分 类 号：TN914.53[电子电信—通信与信息系统]