Performance Analysis of Multiuser DS-CDMA Receivers
Gurpreet Kaur, Mohit Kumar Srivastava, Ashish Gupta · 2014
The DS-CDMA (Direct Sequence Code Division Multiple Access) technique is widely used in cellular systems where each user is assigned a unique spreading code. The growth in applications of DS-CDMA is due to its robustness to fading, its anti interference capability and the potential for multiple access. Spread spectrum signal occupies a large bandwidth, only a small portion of this signal undergoes fading due to multipath at any given time. DS-CDMA can reject narrowband interference, as narrowband interference affects only a small portion of the spread spectrum signal. In this paper the performance of a Multiuser DS-CDMA system is investigated in presence of multiple access interference (MAI) and AWGN. This paper also compares the performance of the conventional single user matched filter (SUMF) with the performance of suboptimal linear multiuser detector (MUD) and suboptimal non linear multiuser detector MUD. For this analysis the three types of receiver are proposed i.e. matched filter receiver, decorrelator receiver and Successive Interference Cancellation (SIC) MUD. The simulation result shows the better performance of SIC detector over conventional SUMF and Decorrelator receiver.