多载波CDMA、RAKE系统抗干扰能力分析

Anti-interference capability analysis of multicarrier RAKE system

基于多载波传输技术和RAKE接收机原理,本文提出了一种直接序列码分多址(DSCDMA)RAKE系统模型.当存在多址干扰和窄带干扰时,分析了系统在Rayleigh衰落信道下的性能,并与单载波RAKE系统及多载波DS CDMA系统性能作了比较.仿真结果表明:只要选择合适参数,多载波DS CDMA RAKE系统有更强的抗窄带干扰及多址干扰能力,并能支持更多的用户数.

In this paper, based on the theory of multicarrier（MC） signaling technique and the RAKE receiver, a multicarrier DS-CDMA RAKE system is proposed. We evaluate the system performance over Rayleigh fading channel with multiple access interference（MAI） and narrow-band interference（NBI） present, and compare the results with those of both a single carrier RAKE system and a multicarrier DS CDMA system. It is shown from the simulation results that the presented model has larger capability of suppressing narrow-band interference and multiple-access interference and can support more number of users when the system parameters are selected properly.