Correlation bandwidth characteristics for paths between base station and building roofs

Correlation (coherence) bandwidths for the paths between base station and b uilding roof antennas mere obtained from the amplitude-frequency characteri stics measured on the roofs of 11 buildings in Tokyo, Japan, in the 900-MHz band. For the cases where the base-station antenna was in line-of-sight fr om the building roof antenna and the propagation loss was 2-9 db larger tha n the free-space propagation loss, the correlation bandwidth decreased as t he excess loss from free-space propagation loss increased. For out-of-sight cases, correlation bandwidths ranged from 38 to 320 kHz and were similar t o those estimated for on road, The correlation bandwidth measured using a 1 2-element Yagi antenna was double that measured with a half-wave dipole ant enna.