Multiuser receiving device for use in a CDMA communications system

摘要

In a multiuser receiver for use in a Code Division Multiple Access (CDMA) system to produce first through N-th demodulated signals for N-th users in response to an input signal where N is an integer not smaller than unity, the receiver has first through M-th stages, where M is an integer not smaller than unity. In each stage, first through N-th interference cancellation units are included to form the first through the N-th users. Each interference cancellation unit is supplied with a cancellation error signal obtained from a previous interference cancellation to produce an interference replica signal and a spread signal concerned with a difference between the interference replica signal and a previous interference replica signal. An n-th interference replica signal is successively sent to an n-th user of the following stages to be demodulated into an n-th demodulated signal which is received by an n-th user where n is an integer between 1 and N, both inclusive.