Performance of STBC-MC-CDMA system based on complex wavelet packet and turbo coding

摘要

On the basis of analyzing the principle of the space-time coding technique and the multi-carrier code division multiple access (MC-CDMA) technique,adopting the turbo codes as channel coding and the optimized complex wavelet packet as multi-carrier modulation,a novel space-time block coded the MC-CDMA system based on complex wavelet packet and turbo coding is proposed,and the system bit error rate (BER) performance in the Rayleigh fading channel is investigated.The system can make full use of space-time block codes' transmit diversity and turbo codes' good ability against fading channel to improve the BER performance significantly,and it can also avoid the decrease of spectrum efficiency of conventional MC-CDMA due to inserting cyclic prefix (CP) by utilizing superior characteristics of the optimized complex wavelet packet.Simulation results show that the proposed space-time block coded MC-CDMA system based on the complex wavelet packet performs better than the conventional space-time block coded MC-CDMA (STBC-MC-CDMA) system,and slightly outperforms the STBC-MC-CDMA with CP.Moreover,the application of the space-time block coding technique concatenated with turbo codes strengthens the system ability to combat various interferences in fading channel further.