GSM-R信号相关性对同频干扰性能的影响

Effects of GSM-R Signals Correlation on Performance of Co-channel Interference

在GSM-R移动通信网络建设中应特别注意干扰问题,以便GSM-R网络更好地发挥作用。文中首先推导了GSM-R线状蜂窝覆盖模式下的同频干扰概率;然后应用Wilkinson方法推导了非线状蜂窝覆盖模式下经历阴影衰落的多个相关干扰源情况下的同频干扰概率公式;最后,通过仿真分析,验证了同频干扰概率随着同频复用组增大而减小,经历相关阴影衰落的同频干扰信号间的相关性对同频干扰概率有较小的影响,有用信号与各同频干扰信号间的相关性对GSM-R系统同频干扰概率的影响较大。

In order to better play a role,in GSM-R mobile communication network construction should pay special attention to interfer- ence problem. First derive the probability of co-channel interference in GSM-R system where the system is linear covered. And then, derive the probability of co-channel interference applying the Wilkinson method which signals undergo correlated shadowing fading where the system is nonlinear covered. In the end, through the simulation analysis, tested that the probability of co-channel interference is decreasing with increasing the co-channel reusing group, the correlation between co-channel interference undergoing correlated log-normal shadowing has little impact on the probability of co-channel interference, the correlation between useful signal and the each co-channel interference signal has great influence on the probability of co-channel interference in GSM-R system.