Abstract: In this paper, through analyzing the principle of MC-DS-CDMA, we propose a novel multi-band complex wavelet based on the MC-DS-CDMA system by adopting the optimized multi-band complex wavelet. We also investigate the system bit error rate (BER) performance in the multi-path Rayleigh fading channel. Meantime, the space diversity combining (SDC) technique is exploited to further perfect the system's performance. Simulation results show that the proposed system outperforms the conventional MC-DS-CDMA and the real wavelet packet based MC-DS-CDMA, it has superior capability against fading. The proposed SDC-based system with lower BER can significantly strengthen the capability to combat multi-path interference and multi-access interference (MAI).

Key words: multi-band complex wavelet, multi-carrier technique, SDC, DS-CDMA