Fading of wide band signals associated with displacement of the mobile in urban environments

Many measurements of wideband channel characteristics have focused on delay spread and the number of RAKE fingers that are active in a given channel bandwidth. Little consideration has been given to the life time/distance of fingers as the subscriber moves along the street. To predict RAKE finger life distance, we use 3D ray tracing techniques in a typical urban street scene. Simulations are run for the cities of Seoul, Korea and Munich, Germany at 900 MHz, assuming a 5 MHz bandwidth. The median life distance of the second, third and fourth fingers are found to be 8-15 m, although the life distance of the second finger is sometimes very long.