Linear multiuser detection study in DS-CDMA system in AWGN channel

Direct sequence code division multiple access has been very successfully used by the military for decades and now is the most popular wireless technology. This paper presents comparative study between linear multiuser detectors, and conventional single user matched filter in DS-CDMA system. Analysis and simulations are conducted in synchronous AWGN channel, and Gold sequence is used as the spreading codes. The study shows that linear multiuser detectors perform better than the conventional matched filter in terms of BER performance. Although, MMSE detector provides better error performance than the decorrelating detector, the performance of all degrade as number of users increase.