基于优化多带复小波的多载波CDMA及反向链路性能

Reverse link performance of Multicarrier CDMA based on optimized multiband complex wavelet

在分析多载波码分多址的原理基础上,利用优化生成的多带复小波,提出了一种基于优化多带复小波的多载波CDMA系统反向链路模型,并采用基于多天线的空间分集合并(SDC)技术进一步完善所提系统。该系统可利用优化多带复小波的优良特性来避免通常多载波CDMA由于插入循环前缀所带来的频谱效率的下降,在此基础上我们研究了所提系统采用空间分集合并技术时在瑞利衰落信道下的反向链路性能;给出相应的误比特率分析。理论分析和仿真结果表明采用基于最大比合并的SDC技术可显著提高所提系统抗空间衰落和各种干扰的能力,而且基于SDC技术的所提系统要好于同样基于SDC技术的通常多载波CDMA系统和基于实小波包的多载波CDMA系统。

By analyzing of the principle of Multicarrier code division multiple access and the multiband complex wavelet, a optimized multiband complex wavelet based Multicarrier CDMA system reverse link model was proposed, and space diversity combining （SDC） technique was adopted to perfect the system performance further. The system can avoid the decrease of spectrum efficiency of conventional Multicarrier CDMA due to inserting cyclic prefix by utilizing the superior properties of optimized muhiband complex wavelet. The reverse link performance of the proposed system with SDC technique was investigated in Rayleigh fading channel, and corresponding bit error rate （BER） analysis was also presented in detail. The theoretical analysis and simulation result show that the application of SDC technique can improve the proposed system ability to combat spatial fading and various interferences effectively. Moreover, the BER performance of proposed system based on SDC technique is superior to that of SDC based Multicarrier CDMA system and real wavelet packet system.