Propagation Measurements for 900 MHz Mobile Digital Communication System

Impulse response data for different urban and suburban propagation media are recorded using correlating techniques in typical european environment. For the first time these data give a characterization of the time-varying nature of the multipath environments. The experimental investigations presented here differ from those previously available in several respects: - a new measurement procedure was applied - rapid change of the channel impulse response is measured as a function of time and displacement - the time-variances of multipaths with different excess delays are measured It was found that the multipath characteristics and the corresponding coherence bandwidth is extremely dynamic with large variations.