作　　者： ; ; ;

机构地区： 东南大学信息科学与工程学院移动通信国家重点实验室

出　　处： 《Journal of Southeast University(English Edition)》 2004年第2期143-147,共5页

摘　　要： 在分析多载波码分多址 (MC CDMA )的原理基础上 ,提出了一种基于复小波包的MC CDMA系统 .同时 ,研究了该系统分别采用等增益合并和最大比合并时在Nakagami m衰落信道下的性能 ;并推导了相应的误码率表达式 .该系统能克服通常MC CDMA系统由于插入循环前缀(CP)所带来的频谱效率的下降 .理论分析和仿真结果表明 :该系统要优于通常MC CDMA系统和基于实小波包的MC CDMA系统 ,有着优越的抗多径衰落和多址干扰能力 ,而且该系统也优于采用CP的通常MC CDMA系统 . On the basis of analyzing the principle of multicarrier code division multiple access (MC-CDMA), an optimized complex wavelet packet based MC-CDMA system (CWP-MC-CDMA) is proposed. The system performances with equal gain combining (EGC) technique and maximum ratio combining (MRC) technique in Nakagami-m fading channels are investigated, respectively; and the corresponding bit error rate (BER) expression is derived. The system can overcome the decrease of spectrum efficiency of discrete Fourier transform (DFT) based conventional MC-CDMA (DFT-MC-CDMA) due to inserting a cyclic prefix (CP). Theoretical analysis and simulation results show that the CWP-MC-CDMA system outperforms DFT-MC-CDMA as well as the real wavelet packet based MC-CDMA (RWP-MC-CDMA) system, and has superior ability to combat multi-path fading and multi-access interference (MAI). Moreover, the BER performance of the proposed system is also superior to that of the conventional MC-CDMA with CP.

关 键 词： 复小波包 多载波 最大比合并 等增益合并

领　　域： [电子电信] [电子电信]