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为研究码分多址(CDMA)通信系统的多址干扰性能,利用Matlab/Simulink建立了CDMA通信系统仿真模型,,并对仿真结果进行分析。结果表明,多址干扰是CDMA系统的固有干扰,当同时通信的用户数增多时,多址干扰电平增大,导致系统的误码率也增大。因此,多址干扰是CDMA通信系统本身存在的自我干扰,它限制了蜂窝系统的通信容量。
In order to study the multiple access interference performance of code division multiple access (CDMA) communication system, the simulation model of CDMA communication system is established by using Matlab / Simulink, and the simulation results are analyzed. The results show that multiple access interference is the inherent interference of CDMA system. When the number of concurrent users increases, the multiple access interference level increases, resulting in an increase of the bit error rate of the system. Therefore, multiple access interference is self-interference existing in the CDMA communication system itself, which limits the communication capacity of the cellular system.