A diffusion model for UWB indoor propagation

This paper proposes a diffusion model of the spatially averaged energy profile in time for indoor ultra-wideband links. The consecutive indoor reflections cause the energy to have a diffusion-like behavior that might be modeled by diffusion equations. Basic relations between model parameters i.e., room dimensions, diffusion speed, average reflection and absorption coefficients are hypothesized when no exact information about the rooms and objects inside them are available. The validity of this analytical model is verified with different propagation measurement sets. Also further modifications to improve the model accuracy have been proposed.