D-Model: A New Perspective for Modeling Radio Signal Propagation in Indoor Environment

There are different approaches towards estimating the signal strength in indoor environment, which includes models such as empirical and deterministic models. Empirical Models are simple but less accurate whereas deterministic models have more accuracy but much more complex. In this paper we have identified some limitations of the most widely used empirical model i.e. ‘Wall Attenuation Model’ and presented a new empirical model called ‘D-Model’ to reduce the errors in earlier empirical models. D-model proposed that a single wall do not always attenuate the signal with constant dB loss but it varies with the distance of transmitter as well. D-model considers the wall not as a constant attenuation element but as an increase in the transmitter to receiver distance with a factor called ‘D-factor’. We proved that D-model gives much more accurate signal strength estimations as compared to Wall Attenuation Model.