异步CDMA移动通信系统中的多用户检测器性能分析

Performance of Multiuser Receivers in Asynchronous CDMA Mobile Communications

在异步CDMA移动通信系统中 ,多址接入干扰 (MAI)可以通过多用户检测技术来消除。但在实际应用时 ,由于接收端激活用户数和它们的标识序列 (例如小区间干扰 )并非全部确知 ,因此出现了多址干扰部分未知的问题。本文分析了采用线性多用户检测器 (解相关和MMSE估值 )接收时 ,未知多址干扰对系统性能的影响 。

In the CDMA mobile communication system, multiple access interfence can be cancelled by multiuser detection technique. The multiple access interference may be unknown in several practical CDMA applications where the receiver may not have full knowledge of the number of active users and their signature sequences(e.g. intercell interference). In this paper, we investigate the effect of unknown multiple access in the bit-error-rate(BER) achieved by linear multiuser detectors(decorrelating and MMSE). BER is computed for both AWGN and Rayleigh fading channels.