車間電波傳播模型之建構與量測

Abstract

本論文提供行動車機對行動車機之間的電波傳播模型，與通道特性之量測於900MHz以及1200MHz。它是由適應環境式模型(Site-specific Model)和統計模型組合而成，適應環境式模型可計算直接波地面反射波與牆壁的散射波。而散射模型則可用來描述傳播環境中隨機擺放的散射體所造成的散射場。藉由電波場強量測實驗數據與該模型模擬結果之比較，混合模式模型能同時可精確地預估電波的傳播路徑損耗、遮蔽效應、以及小尺度衰弱。

In this paper, vehicle-to-vehicle radio channels are explored and modeled. A deterministic-statistical (hybrid) spatio-temporal model for vehicle-to-vehicle channels is developed. The model combines a deterministic model with a statistical model. The latter one employs statistical approach to calculate the scattered fields due to randomly positioned scatterers in the first Fresnel zone, which represent the vehicles, trees, lampposts, and motorcycles in the zone. The model is validated by comparing the computed result with the measured averaged path loss, shadowing and small scale fading at 900MHz and 1200MHz. The hybrid model has been proved to be effective and accurate.