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Capacity of CDMA system is interference limited. Multiuser detection is one of the methods used to enhance the capacity of CDMA system. In this paper, an improved MMSE based multiuser detector is proposed. The conventional detector is optimized to combat the Additive White Guassian Noise (AWGN), while MMSE detector has the lowest Bit Error Rate (BER) among suboptimum linear detectors. The proposed detector uses the conventional detector output in arriving at its decision; therefore a substantial improvement could be expected. For a synchronous CDMA system, the authors' simulation results show a significant improvement in BER over MMSE detector.
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