异步多径条件下空时CDMA多用户检测

本文利用最小均方误差准则,推导了异步多径条件下空时CDMA多用户检测算法,分析了多用户检测与单用户检测关系,提出空时CDMA多用户检测接收机结构。基于SAGE迭代算法进行空时多用户检测,并利用CDMA信号的有限字符特性和上行信道的导频信息对SAGE算法提出改进。仿真结果说明了本文提出的空时CDMA多用户检测算法性能。

Space-time Multiuser Detection in Asynchronous Multi-path CDMA Systems

Space-time multi-user detection for CDMA communication systems is considered in this paper. The multi-user receiver structure is proposed on the basis of minimal mean square rule. And a new space-time multi-user algorithm is derived. The relation of single user detection and multi-user detection is also analysized. In the meantime, space-time multi-user detection is performed based on SAGE algorithms, and an improving method is proposed using the FA characteristics of CDMA signal and pilot information for up-link. Computer simulations illustrated that the performance of the algorithms proposed is much better than that of traditional single-user detection.