Effectiveness and performance analysis of MC-CDMA system

To achieve high data rate, large system capacity and multimedia services the next generation wireless communication system uses a multiple access technique such as Multi Carrier Code Division Multiple Access (MC-CDMA). It is actually the mixture of two efficient techniques such as CDMA and OFDM. The CDMA part enhances the spectrum utilization whereas the OFDM part reduces multipath fading and ISI. The OFDM technique uses narrowband signal to reduce the frequency selective multipath fading because narrowband signal are less sensitive to ISI and frequency selective multipath fading. The spreading sequences used in a CDMA system have an efficient role in interference reduction and spectrum utilization. With the use of efficient spreading sequence the system enjoys low interference. The performance of the system will depend upon the correlation properties and length of the spreading sequences used. In this paper we are suggesting a novel coding technique which may further improve the system performance in terms of bit error rate (BER) with the use of Low Density Parity Check (LDPC) codes as the error correcting code. An intensive comparative study were carried out to compare the performance of MC-CDMA system in terms of BER Vs SNR and PAPR Vs CCDF curves based on the coding techniques such as Walsh-Hadamard (WH) code and Zero Correlation Zone (ZCZ) code.