Investigation of V2I channel transitions in urban environment

This paper investigates the behaviour of Vehicle-to-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 co- and cross-polar 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.