Directional dependence of indoor multipath propagation characteristics

The directional characteristics of indoor multipath propagation are derived from measurements of delay profiles. The reflection points are also estimated by applying the superresolution estimation technique to delay profiles. Measurements were made at 2.3 GHz. It is shown that there are strong waves propagating mainly in the horizontal direction and arriving at the receiving point semiperiodically. They may have horizontal circulating paths or shuttling paths between the parallel walls. There are also weaker scattered waves received almost uniformly in all directions, which decay exponentially with the passage of time. Some waves propagate along the paths corresponding to specular reflections by walls.<>