Simulation of reflection effects for a dedicated short range microwave communication system

Reflection effects can severely degrade the performance of electronic road pricing systems in which communication must take place between a fixed road side system and an on-board unit in a moving vehicle. This degradation is caused by destructive and constructive interference between the direct-path signal and reflected signals. Such interference will also occur in systems using circularly polarised waves. Depolarisation will also have a negative influence on the communication. Both problem areas, which are closely related, are investigated by numerical simulations. The degradation is determined and a solution to overcome this problem is suggested