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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 ,并且仿真计算在AWGN和Rayleigh两种信道下的误码率
In asynchronous CDMA mobile communication systems, multiple access interference (MAI) can be eliminated by multi-user detection techniques. However, in practical applications, the problem that the part of the multiple access interference is unknown is not fully known because the numbers of users activated at the receiving end and their identification sequences (for example, inter-cell interference) are not all known. This paper analyzes the impact of unknown multiple access interference on the system performance when using linear multi-user detector (decorrelation and MMSE estimation), and simulates the bit error rate under AWGN and Rayleigh channels