Performance of Turbo-coded MC-CDMA system based on complex wavelet packet in Rayleigh fading channel

In this paper, on the basis of analyzing the principle of multi-carrier code division multiple access (MC-CDMA) technique, by employing the optimized complex wavelet packet as multi-carrier modulation and the turbo codes as channel coding, we propose a novel MC-CDMA system based on complex wavelet packet and turbo coding, and investigate the system bit error rate (BER) performance in Rayleigh fading channel. The system can overcome the decrease of spectrum efficiency and energy of conventional MC-CDMA due to inserting cyclic prefix (CP); and make full use of the turbo codes' good capacity against fading channel to improve the BER performance further. Theoretical analysis and simulation results all show that the proposed system outperforms conventional MC-CDMA system, and its performance is superior to that of the conventional MC-CDMA with CP. Meanwhile, the application of turbo coding strengthens the system ability to cope with multi-path fading and multi-access interference (MAI) significantly.