Uplink performance of complex wavelet packet based multi-carrier CDMA system with space diversity combining technique

In this paper, based on the analysis of the principle of multi-carrier code division multiple access (MC-CDMA) and the use of the optimized complex wavelet packet, a complex wavelet packet based MC-CDMA (CWP-MC-CDMA) system uplink model Is proposed, and space diversity combining (SDC) technique is adopted to perfect the system performance. Meanwhile, the ICWPT (inverse complex wavelet packet transform)/CWPT replaces IDFT/DFT operator in conventional MC-CDMA for multi-carrier modulation and demodulation, thus the decrease of spectrum efficiency of conventional MC- CDMA due to Inserting cyclic prefix is overcome by utilizing the superior properties of optimized complex wavelet packet. The uplink performance of the proposed CWP-MC-CDMA system with SDC technique is investigated in Rayleigh fading channel, and corresponding BER (bit error rate) analysis is also given In detail. The theoretical analysis and simulation result show that the application of space diversity combining technique can Improves the proposed CWP-MC-CDMA system ability to combat spatial fading and various interferences effectively. Moreover, the proposed system based on SDC technique has superior BER performance over the DFT and SDC based MG CDMA system and real wavelet packet and SDC based MG CDMA system.