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A reduced complexity weighted SIC detector for large wireless communication systems

In this work, a reduced complexity wideband linear SIC multi-user detector that is suitable for large-dimension wireless/wired systems in which the multi-access interference is varying rapidly (i.e. current long-code CDMA systems) is introduced. The proposed scheme exhibits low computational complexity and can converge to either the decorrelator or the LMMSE detectors. It uses a set of weighting factors to determine which average BER level the linear SIC converges to. The complexity reduction achieved is about 20% less than that of the original wideband linear SIC structure. Finally, simulation results for both a synchronous CDMA AWGN channel and coded/uncoded asynchronous multipath fading channel are provided to substantiate the proposed detector.