Investigation of V2I Channel Transitions in Urban Environment

This paper investigates the behaviour of Vehicleto-Infrastructure (V2I) channels when propagation conditions transition from Line-of-Sight (LoS) to Non-Line-of-Sight (NLoS) and when the vehicle is approaching an open square from a narrow street. The measurement data used is obtained from a channel sounding campaign at 2.53 GHz center frequency in the city of Bonn, Germany. The channel is investigated in terms of average receive power separated into coand crosspolar components. Furthermore, second order statistics such as delay and angular spreads are analysed. We observe a similar behaviour when links transition between LoS and NLoS and between open square and narrow street. In both cases power decreases and spreads increase. A transition area can be identified that starts/ends well before/after the actual LoS area or open square indicating the necessity of proper modelling of such areas.