MC-CDMA调制在散射通信信道下的性能分析

摘要

为提高对流层散射通信系统容量和抗干扰能力,对散射信道下的多载波扩频方案进行研究.基于所建立的Rayleigh 分布对流层散射信道模型,分析了频域扩频多载波技术MC-CDMA的系统性能,对典型散射信道下的系统误码率进行了分析与仿真.结果表明:MC-CDMA可有效提升散射通信系统容量,单用户时系统误码率性能较好,随着用户数和散射信道多普勒频移的增大,系统误码率随之增大,需采用多址干扰控制和子载波干扰消除技术来改善系统误码率性能.%To improve communication capacity and anti-jamming property, multi-carrier spread spectrum modulation is introduced in tropo communication. The tropo multipath fading channel is modeled and the MC-CDMA system performance is evaluated. Then, simulations are carried out to evaluate the system BER performance over typical tropo channel. Results show that, for a single user, the system has good bit error rate performance, which demonstrate that MC-CDMA scheme can improve the tropo communication capacity. With the increasing of number of users and the dopploer spread of tropo channel, the BER increases. As a result, multi-access interference control and inter-carrier interference cancellation measures should be used to improve BER performance.