On-body channel correlation in various walking scenarios

To investigate on-body channel space-time correlation characteristics in various walking scenarios, we analyze the correlation properties at 4.2 GHz between two on-body radio links with a transmitter on the heart and receivers on both hands. For that purpose, two different measurement campaigns are exploited. The results show that, depending on the walking scenario, the space-time correlation characteristics can vary from very stationary to not stationary at all. More exactly, the stationarity cases correspond to the scenarios where the subjects walk uniformly and regularly along a straight line with periodic arm swings, whereas the non-stationary behavior arises from random trajectories and irregular arm swings.