Patent ID: 6081516
Filing Date: 2000-06-27
Classification: H04B

Abstract:
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, said receiver having first through M-th stages, where M is an integer not smaller than unity, said multiuser receiver comprising:first through N-th interference cancellation units, which are included at each stage within the first through the M-th stages and which are supplied with cancellation error signals obtained from a previous interference cancellation, for producing first through N-th interference replica signals of a present stage and first through N-th spread signals representing differences between the interference replica signals of the present stage and interference replica signals of a previous stage,wherein said interference replica signals are comprised of a combination of identification symbols and transmission channel characteristics, and further wherein said identification symbols are transmission symbols chosen by a decision circuit from a combined signal of all demodulated signals which have been received, and said transmission channel characteristics are characteristics of signal paths of the demodulated signals.