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随着城市移动通信的迅速发展,网络规模越来越大,传播环境也更加复杂,因此研究电波的传播特性和干扰特性变得非常重要。运用传播预测模型可以了解系统覆盖区每个接收点接收信号的强度以及它的波动变化情况,有助于对通信网络进行规划、优化,使网络达到满意的质量。本文首先分析了现有的几种室外传播预测经验模型,然后用Matlab工具分别对几种室外经验模型进行了仿真。接着通过改变传播参数值,得到不同的路径损耗曲线和场强预测曲线,并将得到的曲线进行比较,分析各传播参数对路径损耗和信号强度的影响。
With the rapid development of urban mobile communications, the scale of the network is becoming larger and the propagation environment is more complicated. Therefore, it is very important to study the propagation characteristics and interference characteristics of radio waves. The propagation prediction model can be used to understand the strength of the received signal and the variation of its fluctuation at every receiving point in the system coverage area, which helps to plan and optimize the communication network and achieve a satisfactory quality of the network. This paper first analyzes several experiential models of outdoor propagation prediction and then simulates several outdoor experiential models separately with Matlab tools. Then by changing the propagation parameter values, different path loss curves and field strength prediction curves are obtained, and the obtained curves are compared to analyze the influence of propagation parameters on path loss and signal strength.