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The existence of wide-sense-stationarity (WSS) in narrowband wirelessbody-to-body networks is investigated for "everyday" scenarios using many hoursof contiguous experimental data. We employ different parametric andnon-parametric hypothesis tests for evaluating mean and variance stationarity,along with distribution consistency, of several body-to-body channels foundfrom different on-body sensor locations. We also estimate the variation ofpower spectrum to evaluate the time independence of the auto-covariancefunction. Our results show that, with 95% confidence, the assumption of WSS ismet for at most 90% of the cases with window lengths of 5 seconds for thechannels between the hubs of different BANs. Additionally, in the best-casescenario, the hub-to-hub channel remains reasonably stationary (with more than80% probability of satisfying the null hypothesis) for longer window lengths ofmore than 10 seconds. The short time power spectral variation for body-to-bodychannels is also shown to be negligible. Moreover, we show that body-to-bodychannels can be considered wide-sense-stationary over significantly longerperiods than on-body channels.

Wide-Sense-Stationarity of Everyday Wireless Channels for Body-to-Body Networks