CDMA通信系统多址干扰的仿真研究

Simulation Studies of Multiple Access Interference of CDMA Communication Systems

为了研究CDMA通信系统的多址干扰,本文利用Matlab提供的可视化仿真工具Simulink建立了CDMA通信系统仿真模型,详细讲述各模块的设计及参数设置,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 multiple access interference of CDMA Communication systems, the simulating model of the system is built by using SIMULINK, which is provided by Matlab. And every module and parameter of the model are introduced in detail. Meanwhile, the simulating result is analyzed. It is showed that multiple access interference is intrinsic interference of CDMA Communication Systems. The more the users are communicating simultaneously, the more the levels of multiple access interference are. Thus code error rate becomes bigger too. Therefore, multiple access interference is self interference of CDMA Communication Systems, it restricts capacity of cell systems.