Wide-Sense-Stationarity of Everyday Wireless Channels for Body-to-Body Networks
Samiya M. Shimly, David B. Smith, Samaneh Movassaghi

TL;DR
This study investigates the wide-sense-stationarity of body-to-body wireless channels in everyday scenarios, finding that such channels are often stationary over short periods and more stable than on-body channels, which impacts network design.
Contribution
The paper provides empirical evidence on the WSS properties of body-to-body channels, demonstrating their stationarity over longer durations than on-body channels in real-world conditions.
Findings
WSS is met in up to 90% of cases for 5-second windows between BAN hubs.
Hub-to-hub channels remain stationary for over 10 seconds with high probability.
Body-to-body channels are more stationary over longer periods than on-body channels.
Abstract
The existence of wide-sense-stationarity (WSS) in narrowband wireless body-to-body networks is investigated for "everyday" scenarios using many hours of contiguous experimental data. We employ different parametric and non-parametric hypothesis tests for evaluating mean and variance stationarity, along with distribution consistency, of several body-to-body channels found from different on-body sensor locations. We also estimate the variation of power spectrum to evaluate the time independence of the auto-covariance function. Our results show that, with 95% confidence, the assumption of WSS is met for at most 90% of the cases with window lengths of 5 seconds for the channels between the hubs of different BANs. Additionally, in the best-case scenario, the hub-to-hub channel remains reasonably stationary (with more than 80% probability of satisfying the null hypothesis) for longer window…
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