Performance of Blind Successive Interference Canceller for Multi-Carrier CDMA Systems

An efficient multiple user access over the wireless channel necessitates a communication system design that can overcome the adverse impact of multipath propagation such as Inter Symbol Interference (ISI) and Multiple Access Interference (MAI). This being the objective, a Multi-Carrier Code Division Multiple Access (MC-CDMA) communication system is discussed in this paper. MC-CDMA, being a combination of Direct Sequence Code Division Multiple Access (DS-CDMA) and Orthogonal Frequency Division Multiplexing (OFDM), converts a frequency selective fading channel into multiple flat fading channels, thereby mitigating Inter Symbol Interference (ISI). To overcome the effect of Multiple Access Interference (MAI), Multi-User Detection (MUD) receiver has been suggested. The performances of Blind Successive Interference Cancellation (BIC) technique is compared with Matched Filter (MF) receiver and Block-based Minimum Mean Square Error (BMMSE) receiver by simulating the entire system. The BIC is a MUD technique that uses knowledge of the desired user’s signature sequence and his timing to estimate his information. This is done by executing interference cancellation in a successive manner, starting from the most dominant component and successively canceling the weaker ones. The simulation results show that the BIC scheme outperforms conventional MF receiver and BMMSE receiver.