900 MHz multipath propagation measurements in four United States cities

Describes multipath power delay profile measurements of 900 MHz mobile radio channels in four US cities. Preliminary data show that for over 98% of the measured locations, RMS delay spreads are less than 12 mu s. In very rare instances, reflections from city skylines and mountains can cause RMS delay spreads which exceed 20 mu s and excess delays which exceed 100 mu s. Such large excess delays have not been previously reported in the literature.