Performance of Multi-carrier CDMA System Based on Optimized Multiband Complex Wavelet and Turbo Coding
Yu Xiang-bin①②; Xu Wei-ye③; Bi Guang-guo①
①National Mobile Communications Research Lab.,Southeast University Nanjing 210096 China;③Communication Engineering Department Nanjing Institute of Technology Nanjing 210013 China
Abstract：In this paper, on the basis of analyzing the principle of Multi-Carrier Code Division Multiple Access (MC-CDMA) technique, by adopting the optimized multiband complex wavelet as multi-carrier modulation and the turbo codes as channel coding, a MC-CDMA system based on optimized multiband complex wavelet and turbo coding is proposed, and the system bit error rate performance is investigated in Rayleigh fading channel. The system can overcome the decrease of efficiency of spectrum 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 system performance further. Theoretical analysis and simulation results all show that the proposed system outperforms conventional MC-CDMA system, and the performance of the system 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.
2005, Vol. 27 
