Performance Analysis of Multi User Detectors for Synchronous Ds-Cdma Systems
I. Krishna Rao1, K. Santhosh Kumar2
1I.Krishna Rao, Electronics & Communication Engineering, Vignan’s Institute of Information Technology, Visakhapatnam, India,
2K. Santhosh Kumar, Electronics & Communication Engineering, Vignan’s Institute of Information Technology, Visakhapatnam, India,
Manuscript received on September 01, 2012. | Revised Manuscript received on September 02, 2012. | Manuscript published on September 05, 2012. | PP: 211-214 | Volume-2 Issue-4, September 2012. | Retrieval Number: D0945082412/2012©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: A Direct sequence code division multiple access (DS-CDMA) is a popular wireless technology. This system suffers from Multiple Access Interference (MAI) caused by Direct Sequence users and near –far effect. Multi-User Detection schemes are used to detect the users’ data in presence of MAI and near- far problem. In this dissertation, we present 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 and Kasami sequence are used as the spreading codes. Simulation results depict the performance of three detectors, conventional detector, Decorrelating detector and MMSE (Minimum Mean Square Error) detector. It shows that the performance of these detectors depends on the length of PN code used and Number of users. Linear multiuser detectors perform better than the conventional matched filter in terms of BER performance.
Keywords: AWGN CHANNEL, BER, MAI, MMSE.