Modeling of Short-Range Ultraviolet Communication Channel Based on Spherical Coordinate System

The study on short-range ultraviolet communication (UVC) channel modeling is often based on prolate-spheroidal coordinate system in the previous studies. In this letter, we propose a single scattering coplanar model based on spherical coordinate system, where the transmitter beam and receiver field of view (FOV) can point arbitrarily under the limitation that the sum of transceiver elevation angles and half of their own FOV is less than 180°, and the transmitter beam and receiver FOV are above ground. We utilize the number of intersections between a special ray on the transmitter cone and the receiver conical surface to distinguish the UVC scenarios, which makes the analysis of UVC channel modeling comprehensible. Meanwhile, we validate the proposed model in comparison with the single scattering model and the Monte Carlo simulation model through numerical calculations. The results show that the proposed model agrees well with both models. This letter presents a new method to estimate the path loss of short-range UVC and provides guidelines for the experimental system design.