Ultra-wideband measurements and results for sparse off-body communication channels

This paper presents a measurement-based statistical channel model for describing UWB off-body propagation and is valid for the frequency range from 3.5 to 6.5 GHz. This model is expressed with respect to both radial and azimuth coordinates, and is physically motivated by creeping wave propagation around smooth convex surfaces, such as the human body. Consequently, it maintains the exponential decay path loss trend with respect to the body orientation angle. Furthermore, it is shown that the same model can be used for RMS delay spread prediction, by simply applying the appropriate parameters resulting from time dispersion analysis. Therefore, delay spread results are presented for threshold values of 10 and 20 dB within the peak of each power delay profile. Following the presented modeling method model parameters can be used as criterion for characterization of respective dense multipath channels.