一种无遮挡场景下的无线信道模型的建立

Establishment of Wireless Channel Model for Unblocked Scene

根据给定的无线信道通信的场景特点,建立了3种无线信道模型,即自由空间传播模型、双线模型和自由空间传播-双线模型。利用MATLAB对这3种模型接收信号强度分别进行仿真和分析,结果表明这3种模型接收信号强度曲线近似,但是当天线高度逐渐变高时,自由空间传播-双线模型接收信号强度曲线与自由空间模型、双线模型的曲线明显不同,它的波形会出现周期起伏,且在相同天线高度下不同地面反射系数对接收信号强度的影响很小。因此应选择自由空间传播-双线模型作为该场景的无线信道模型。

According to the given scene of the wireless channel communication , such three kinds of wireless channel model as free space propagation model,bilinear model and free space propagation -bilinear model have been established .The received signal strength of the three model were simulated and analyzed by MAT-LAB.The results showed that the received signal strength curve of the three models were similar ,but when antenna height got higher,the received signal strength curve of free space propagation -bilinear model was significantly different from that of the free space model and bilinear model , its waveforms appeared periodic ups and downs.Under the same antenna height,different surface reflection coefficient exerted slight influence on received signal strength.Therefore free space propagation -bilinear model should be selected as the scene's wireless channel model.