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研究多径衰落信道下的MC-DS-CDMA系统性能,子载波采用RAKE和最大比合并(MRC)接收方式.分析与计算了接收信号中有用信号和各干扰分量的数学统计特性,并在此基础上推导了系统的误比特率(BER)公式.仿真中考虑了系统用户数量、信道衰落指数以及延时功率谱衰减系数等参数对系统BER的影响.对系统性能进行了仿真验证,结果表明:给出的结果具有通用性,改变信道衰落指数和功率延迟谱衰落系数,可得到不同衰落信道类型下的系统BER;用户数目和信道衰落指数对系统BER影响大,而多径功率衰落系数对其影响较小.
The performance of MC-DS-CDMA system under multi-path fading channels is studied, and RAKE and MRC are adopted as subcarriers. The mathematical statistics of useful signals and interference components in the received signal are analyzed and calculated. (BER) formula of the system is deduced.The influence of parameters such as system user number, channel fading index and delay power spectrum attenuation coefficient on the system BER is considered in the simulation.The system performance is verified by simulation, the results show that : The results given are universal. The system BER under different fading channel types can be obtained by changing the channel fading index and power delay spectrum fading coefficient. The number of users and the channel fading index have a great influence on the system BER, while the multipath power fading coefficient pair Its impact is small.