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An Approach to Minimize the Impact of Residual MAI in MMSE Multiuser Detector

Author(s): Pinki Nayak

Journal: Research Journal of Information Technology
ISSN 2041-3106

Volume: 1;
Issue: 1;
Start page: 13;
Date: 2009;
Original page

Keywords: MAI | Multiuser detection | MMSE | interference | Bit Error Rate | AWGN

Capacity of CDMA system is interference limited. Multiuser detection is one of the methods usedto enhance the capacity of CDMA system. In this paper, an improved MMSE based multiuser detector isproposed. 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 proposeddetector uses the conventional detector output in arriving at its decision; therefore a substantial improvementcould be expected. For a synchronous CDMA system, our simulation results show a significant improvementin BER over MMSE detector.
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