多址干擾是CDMA系統中較為突出的干擾，利用多個用戶信息的干擾對消技術可以有效地抑制這種干擾，而干擾對消技術的實現需要信道的衰落估計。該文介紹了信道估計技術及多用戶檢測技術，并通過數值分析說明用戶數及信道估計偏差對多址干擾對消技術性能的影響。
關 鍵 詞 碼分多址; 信道估計; 多址干擾; 干擾對消

Abstract Multiple access interference is one kind of main interference in CDMA system. It can be restrained effectively by interference cancellation , and the realization of this technology needs the estimation of fading channels. This paper introduces the technology of channel estimation and multiple access interference, and states how user amount and deviation of channel estimation can affect the performance of multiple access interference cancellation technology basing on the data analysis result.
Key words code division multiple access; channel estimation; multiple access interference; interference cancellation