Simulation of multicarrier CDMA system in Rayleigh channel

Abstract

The combination of CDMA and OFDM that called "Multicarrier CDMA system" can reduce the interference and improve the performance of the system in fading channel. The conventional multicarrier CDMA system has three schemes. MC-CDMA, MC-DS-CDMA, MT-CDMA. The MC-CDMA transmitter spreads the original data stream over different subcarriers using a given spreading code in the frequency domain. The MC-DS-CDMA transmitter spreads the S/P converted data streams using a given spreading code in the time domain. The resulting spectrum of each subcarrier can satisfy the orthogonal condition with the minimum frequency separation. The MT-CDMA scheme uses longer spreading codes in proportion to the number of subcarriers as compared with a normal DS- CDMA scheme therefore the system can accommodate more users than the DS- CDMA scheme. MC- CDMA scheme can reduce interference and improve performance in fading channel. © 2011 Springer-Verlag.