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中文摘要：
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。
英文摘要：
To improve communication capacity and anti-jamming property, multi-carrier spread spectrum modulation is introduced in tropo communi- cation. The trope 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 trope channel. Results show that, for a single user, the system has good bit error rate performance, which dem- onstrate that MC-CDMA scheme can improve the trope communication capacity. With the increasing of number of users and the dopploer spread of trope channel, the BER increases. As a result, multi-access interference control and inter-carrier interference cancellation measures should be used to im- prove BER performance.
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