Multiuser detection using blockwise successive interference cancellation in DS/CDMA systems

The performance of a new multiuser detector in combination with a blockwise successive interference cancellation (BSIC) scheme for DS/CDMA systems is proposed. The BSIC detector consists of the multistage blocks, which include the power-ranked users to be cancelled. The BSIC scheme is simulated using coherent QPSK modulation under AWGN and Rayleigh fading environments. From the practical implementation point of view, a promising candidate among the multiuser detectors is the SIC detector due to the lower complexity compared to other multiuser detectors. The SIC scheme, however, has two main problems. The first problem is that each user, once selected, makes no; further contribution and refinement for subsequent operations. The second problem is that the hardware complexity of the SIC scheme grows linearly as the number of users increase. We compare the performance and the hardware complexity of the SIC scheme and the BSIC scheme. The experimental results show that as the size of block at the BSIC scheme increases, the performance of the BSIC scheme is improved, outperforming the SIC scheme. The BSIC scheme has low hardware complexity.