Abstract
SUMMARY A minimum mean square error (MMSE) nulling partialparallel interference cancellation (PPIC) receiver for downlink multiple-input multiple-output (MIMO) multicarrier (MC)-CDMA systems is pro-posed. Our analysis shows that, for multiuser MIMO MC-CDMA systems,interference due to frequency selectivity in multipath fading channel causesdetrimental effects on cancelling, thus V-BLASTreceiver shows severe per-formance degradation. The proposed receiver with multistage processing does not produce an error floor in frequency selective fading channel en-vironments and achieves substantial performance gains. The system per-formance of the proposed receiver was evaluated through computer sim-ulations. The simulation results show that, with two stage PPIC process-ing, the proposed receiver achieves performance gains of 2.5–4dB at targetBER of 10 −3 over the linear MMSE receiver. key words: MIMO, MC-CDMA, V-BLAST, PIC 1. Introduction The development of wireless communication systems forhigh data rate transmission and high system flexibility isone of the main targets in next generation wireless com-munications research. MIMO MC-CDMA systems haveattracted significant research interest due to its high spec-tral efficiency, large system capacity and high flexibility fordata rate, and it has been proposed as one of the promissingcandidates for 4th generation wireless communication sys-tems [1]. MIMO MC-CDMA systems are combinations ofMIMO transmission, orthogonal frequency division multi-plexing (OFDM) signaling and CDMA schemes. MC mod-ulation, realized via OFDM, is well suited to high data rateapplications such as multimedia packet transmission andmobile internet in frequency selective fading channels.MIMO systems can achieve very high spectral effi-ciency without additional power or bandwidth in a rich mul-tipath environment by exploiting the extra space dimension.Vertical Bell Labs lAyered Space Time (V-BLAST) is a pop-ular single-carrier single-user MIMO detection algorithm,which is based on the ordered successive interference can-cellation (OSIC) [2]. The principle behind OSIC is that atthe beginning of each stage, the substream with the high-
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