Simulation Based Performance Analysis of MC- CDMA 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   sub-channels,   multipath   fading   could   be minimized. Implementation   of   this   multicarrier modulation technique in CDMA system is known as multicarrier CDMA. This work shows 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 error rate (BER) better than CDMA and signal can be received in low bit error rate (BER).