A sabine-rice approximation for the risk of exceeding immunity

Determining the risk of exceeding the immunity of medical devices in hospitals and generally in indoor propagation environments can be very expensive in terms of computational cost. Typical floor plan dimensions are much larger than the wavelength and medical staff members, carrying wireless devices in order to access patient records, have varying locations. The Sabine method from acoustics can be adapted to provide a very quick, inexpensive estimate of the multipath field. The Ricean probability distribution is used to model the small-scale fading of the signal using parameter values based on the Sabine approximation. The risk of exceeding immunity obtained by Rice-Sabine method is shown to match the empirical results obtained from ray-tracing.