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An Overview of Multiuser Detection Techniques for DS-CDMA in the Light of IMT-2000/UMTS

Third generation mobile communication systems are currently being developed. The use of DS-CDMA in these systems leads to a multiple access interference limited system. Due to cross-correlation between the codes used for spreading the system performance is degraded. Multiuser detection techniques have been developed to limit the impact of this interference. In this paper an overview of Multiuser detection techniques is given. Interference cancellation receivers, such as decorrelator, MMSE receiver, parallel interference cancellation receiver and successive interference cancellation receiver are discussed. The importance of parameter estimation is stessed and the complexity of different multiuser detection schemes is analysed.