Multipath delay estimation for indoor wireless communication

Multipath delay profile measurements were conducted in a meeting room, an office, and a laboratory at 1.5 GHz with 50 ns time resolution to clarify the feasibility of a high-speed digital wireless communication system in an open-structure office room. Continuous power delay profile measurement revealed large variation of power delay profile in the same room. Measured RMS delay spread and mean excess delay were found to be dependent on the size of the room. Multi-reflection on walls was observed when received by a directional antenna. From these results, a simple propagation model for an indoor radio environment is proposed consisting of multi-wall-reflection waves with free space loss and wall-reflection loss, which describes the spatial variation of RMS delay spread.>