Abstract

ABSTRACT In this paper, a new multiuser detection scheme for synchronous DS/CDMA system in AWGN channel is presented.Combining the characteristics ofthe minimum mean squared error (MMSE) blind adaptive multiuser detector and the grouppartitioned multiuser detector, this new detector can be viewed as a generalized multiuser detector. Its relationship withother detectors is also discussed. Good performance has been proven by simulations.This new group partition blind multiuser detector includes two separate parts, a blind adaptive part and a conventional non-adaptive one. All active users are divided into several groups in advance. In the first step, using the modified constrainedblind adaptive multiuser interference cancellation strategy, multi-access interference (MAI) contributed by the users who donot belong to the same group is suppressed. MAI from the users of the same group is suppressed in the second stage by aconventional non-adaptive multiuser detector, where nearly all kinds of previous proposed multiuser detectors can be used.In this way, all multiuser interference is reduced in the two stages. Only the information of the users belonging to the samegroup is needed for detection. Others users' information such as the signature sequences is not used by the detector, whichwill increase the convenience of implementation.Keywords: DS/CDMA, Multiuser detection, Blind adaptive algorithm, Group partition

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