Design of Multi-Carrier CDMA-MIMO System by Various Spreading Strategies

Code Division Multiple Access (CDMA) is one of the channelization protocol. CDMA provides some sort of privacy and only intended receiver can able to receive data. Multi-Carrier CDMA (MC-CDMA) is one of the promising technologies in present and future wireless communications and one of the 4G component. The performance of CDMA system depends on the characteristics of spreading sequence. The spreading sequences must be unique and have better auto correlation and cross correlation values. Otherwise Multiple Access Interference (MAI) arises that limits the system capacity. In this paper MC-CDMA system is implemented with maximal-length, gold and ZCZ (Zero Correlation Zone) sequences [4]. Multiple input-multiple output (MIMO) technology provides high transmission rate, reliability and diversity for communication systems. In this paper MC-CDMA system is implemented with 4 transmitting and 4 receiving antennas (4x4). BER (Bit Error Rate) performance is measured with three sequences in AWGN, Rayleigh fading channel. And simulated results are shown.