Angular and Multipath Effects in Indoor Visible Light Communication Channels for Biomedical Monitoring Systems

Abstract

The rapid advancement of medical technologies is driving the demand for reliable, energy-efficient, and secure systems capable of real-time health monitoring. The widespread deployment of light-emitting diode lighting systems opens up opportunities for the implementation of promising wireless optical communication technology - Visible Light Communication. This technology transmits data via visible light and offers several advantages over radio-frequency solutions. In the context of medical applications, this is high throughput, data privacy, and the absence of electromagnetic interference on the operation of sensitive medical equipment. However, its implementation is constrained by the requirement for a direct line-of-sight between the receiver and transmitter, and high sensitivity to external optical interference. The study presents models in line-of-sight and no-line-of-sight conditions indoors to assess data transmission parameters and identify factors affecting communication reliability. Using the OptiSystem simulation platform, the effect of emission and incidence angles, along with multipath signal propagation caused by surfaces reflections, we analyzed. The results allowed the determination of optimal emission and incidence angles ranges, and the assessment of the influence of the receiver field-of-view on system throughput.