Path loss models for indoor off-body communications at 60 GHz

In this paper we present some empirically obtained path loss models for 60 GHz line of sight (LOS) and non-LOS (NLOS) off-body communications within indoor environments. In particular, we considered signal propagation from a chest worn millimeter wave transmitter and a hypothetical base station in both a laboratory and seminar room. It was found that shadowing of the direct signal path caused by the wearer's body increased the path loss by more than 20 dB at the reference distance (1 m). The fluctuation of the path loss at each of the measurement locations is modeled as a zero mean Gaussian distributed random variable and a linear relationship between the separation distance and standard deviation of the path loss variation is deduced.