Simulation Based Performance Analysis of MCCDMA and CDMA over Rayleigh Fading Channel

Multicarrier Code Division Multiple Access Schemes (MC-CDMA) have been recently introduced in existing CDMA based systems to improve security, data transmission rate and to minimize Inter Symbol Interference (ISI). CDMA experiences severe multipath fading which badly affects its performance. By transmitting identical narrowband Direct- Sequence (DS) waveforms using frequency diversity, in parallel with a number of subchannels, multipath fading could be minimized. Implementation of this multicarrier modulation technique in CDMA system is known as multicarrier CDMA. We have shown that in Rayleigh Fading Channel, due to multicarrier modulation, when one subcarrier goes deep fade, another subcarrier remains safe. Therefore MC-CDMA can combat multipath fading better than CDMA and signal can be received in low bit error rate (BER).