Dynamic On-Body UWB Radio Channel Modeling

This article presents dynamic on-body radio channel modelling for ultra wideband (UWB) wireless body area network communication. The work is based on frequency domain measurements with a vector network analyzer in an anechoic chamber at a 2-8 GHz frequency band. Two planar UWB antennas were used (dipole and double loop) and they were attached in total eight on-body locations. First, the mean values, standard deviations, maximum and minimum values of the path losses variations were examined at ten discrete frequencies and two links. Secondly, all available channels were observed at three selected frequencies. Dynamic channel models were derived for them by categorizing the links in three classes: high, medium or low dynamics channels. A distribution fitting was applied to all. Based on the second order Akaike information criterion, the best model was noted to be the inverse Gaussian distribution.