Analysis of the body proximity cross-polarization power ratio in a human walking motion

This paper presents a preliminary investigation on the body proximity cross-polarization properties considering human walking motion for the applications to BAN (Body Area Network) On-Body wireless communication systems. Firstly, a novel concept of the BP-XPR (Body Proximity Cross-Polarization Power Ratio) in on-body channel is defined, which has been quantified based on relative on-body antenna locations and human walking motion. A human model is utilized for representing the realistic dynamic channel between an access point mounted on the wrist and a sensor module attached to various locations on a human body. The analytical results show that the estimated Cross-Polarization Power Ratio (XPR), given by the proposed BP-XPR, coincides well with the actual value of XPR (BP-XPR_m) observed at wrist using dipole antennas, indicating that the proposed BP-XPR can be used to represent the cross-polarization properties instead of the practical measurement.