作　　者： ; ;

机构地区： 南京航空航天大学

出　　处： 《Journal of Southeast University(English Edition)》 2005年第4期398-404,共7页

摘　　要： 在分析空时编码技术和多载波CDMA技术原理的基础上,采用turbo编码作为信道编码以及优化的复小波包作为多载波调制,提出一种基于复小波包和turbo码的空时分组编码的MCCDMA系统,研究了其在瑞利衰落信道下的误码率性能.该系统能充分利用空时分组编码的发送分集和turbo码的良好抗信道衰落能力显著提高系统性能,而且还能利用优化复小波包的优良特性避免通常MCCDMA系统由于插入循环前缀(CP)所带来频谱效率的降低.仿真结果表明,基于复小波包的空时分组编码的MCCDMA系统要好于空时分组编码的通常MCCDMA(STBCMCCDMA)系统,略好于采用CP的STBCMCCDMA系统;级联turbo码的空时编码技术的应用进一步增强了系统抗衰落信道下的各种干扰能力. 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.

关 键 词： 多载波技术 复小波包 空时分组码 码分多址 编码

领　　域： [电子电信] [电子电信]