Identification of propagation path from low antenna height base station in urban area

The delay spread characteristics in low antenna height propagation in urban areas are difficult to accurately estimate by statistical methods that are highly dependent on the location. To understand how the road system affects the propagation characteristics, the propagation mechanism was analyzed. In practice, the identification of the propagation paths has been attempted by measuring the direction of arrived waves and the delay propagation time (propagation path length) at line‐of‐sight and non‐line‐of‐sight locations. The results clearly showed that many arrived waves are propagated by geometric optical reflections by the walls of buildings, diffractions at the corners of intersections, and their combinations. Furthermore, the calculated results and measurements were compared based on geometric optical methods and wedge diffraction theory to demonstrate the usefulness of geometric optical computational methods. © 2001 Scripta Technica, Electron Comm Jpn Pt 1, 84(12): 41–51, 2001