Using the Right Two-Ray Model ? A Measurement-based Evaluation of PHY Models in VANETs

We discuss the feasibility of simplified Two-Ray Ground path loss models, which are frequently used in simulationbased performance evaluation of Inter-Vehicle Communication (IVC) protocols. We first show that these models are of no benefit compared to the basic Freespace model. As an alternative, we propose a more exact Two-Ray Interference model. We substantiate this claim based on an extensive set of measurements on the road. We demonstrate that this model substantially improves the accuracy of the simulation of radio transmissions at negligible computational cost.