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Design of low-complexity detection schemes that can approach near-optimum Bit Error Rate (BER) performance in multiuser or other Multiple-Input Multiple-Output (MIMO) systems has always been highly challenging. In this paper, the authors propose and investigate a so-called Receiver Multiuser Diversity aided Multi-Stage Minimum Mean-Square Error MultiUser Detection (RMD/MS-MMSE MUD) scheme operated in the principles of Successive Interference Cancellation (SIC). The BER performance of the RMD/MS-MMSE MUD is investigated in association with both the Direct-Sequence Code-Division Multiple-Access (DS-CDMA) communicating over both Gaussian and Rayleigh fading channels, and the Space-Division Multiple-Access (SDMA) communicating over Rayleigh fading channels. Furthermore, they assume that the DS-CDMA and SDMA systems are either full-load or overload.
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