Abstract: In this paper Multi Carrier-Direct Sequence Spread Spectrum CDMA technique has been consider for users to support multimedia service in wireless mobile communication systems. It is a one of the recent technology to provide higher data rates over conventional medium access techniques like Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA) and Code Division Multiple Access(CDMA). Recently, a new CDMA system that combines advantages of both Orthogonal Frequency Division Multiplexing (OFDM) and DS-CDMA which is term as “MC-DS-CDMA,” system combined with the adaptive viterbi decoder algorithm. It is to be considering for bit error rate of system over multipath fading channels.

Keywords: MC-DS-CDMA, OFDM, Adaptive Viterbi Decoder, OSTBC