The vehicle-to-vehicle (V2V) propagation channel has significant implications on the design and performance of novel\ncommunication protocols for vehicular ad hoc networks (VANETs). Extensive research efforts have been made to develop V2V\nchannel models to be implemented in advanced VANET system simulators for performance evaluation.The impact of shadowing\ncaused by other vehicles has, however, largely been neglected in most of the models, as well as in the system simulations. In this\npaper we present a shadow fading model targeting system simulations based on real measurements performed in urban and highway\nscenarios.The measurement data is separated into three categories, line-of-sight (LOS), obstructed line-of-sight (OLOS) by vehicles,\nand non-line-of-sight due to buildings, with the help of video information recorded during the measurements. It is observed that\nvehicles obstructing the LOS induce an additional average attenuation of about 10 dB in the received signal power. An approach to\nincorporate the LOS/OLOS model into existing VANET simulators is also provided. Finally, system level VANET simulation results\nare presented, showing the difference between the LOS/OLOS model and a channel model based on Nakagami-m fading.
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