Modeling of sub-GHz wave propagation in factories for reliable wireless communication

This study presents a sub-GHz band propagation-loss model for a region where the error rate is lower than that observed in previous studies to realize, with high reliability, a wireless control communication system between the equipment in a factory. In particular, we show that the time-varying propagation loss in the line-of-sight channel in the electrical device factories could be approximated using the Rician distribution and determine the minimum values of the K-factors. Furthermore, we suggest the possibility of estimating the fall of propagation loss, which occurs rarely, via extrapolation using fewer samples.