BER Performance of coded MSK/Multi-channel CDMA fourth generation synchronous downlink cellular systems in the presence of MUI and FO

This paper studies the (BER) performance of synchronous coded Minimum Shift Keying/ Multi-channel Code Division Multiple Access (MSK/MC-CDMA) systems in the presence of Multi-access User Interference (MUI), and carrier Frequency Offset (FO). The theoretical effect of MUI on the BER performance was considered assuming the Standard Gaussian Approximation (GA) in AWGN channel. Furthermore, explicit simulations were carried out in AWGN and frequency selective Rayleigh fading channels for various parameters. The un-coded MSK/MC-CDMA system under investigation outperforms the corresponding system with BPSK modulation. Furthermore, a careful choice of coded MSK/MC-CDMA system parameters can achieve a better performance than the theoretical performance in AWGN channel for a single user and with no frequency offset or extra bandwidth requirements.