On the Receiver Design for Downlink of MIMO MC-CDMA Systems over Frequency Selective Rayleigh Fading Channels

In this paper, we propose two receiving schemes for multiple antenna multi-carrier code division multiple access (MCCDMA) systems. Our proposed schemes are based on vertical Bell labs layered space-time (V-BLAST) architecture. The interference cancellation is performed serially on different sub-carriers. The channel matrices related to different sub-carriers are used in the successive interference cancellation (SIC) block. In addition some permutation matrices are used for ordering of transmitted signals in the transmitter. Two schemes, hard and soft, are proposed for signal detection in the receiver. We will show by computer simulations that the proposed schemes have better performance than the other methods like V-BLAST OFDM systems .