Performance Analysis of Indoor Communication System Using Off-the-Shelf LEDs With Human Blockages

This article uses a stochastic geometry model-based approach to analyze the downlink performance of an indoor visible light communication (VLC) system with human blockages. The system performance is analyzed for a regular placement of light emitting diodes (LEDs) in a rectangular configuration. The proposed analysis is divided into two parts. In the first part, it is assumed that human blockages are static. The closed-form expression of the signal-to-noise ratio (SNR) at the receiver with static human blockages is derived. Further, the analysis is extended for the case where blockage mobility has also been considered. We compare the system performance in terms of received SNR for 4 and 8 LED configurations under predefined total power constraint. It is observed that at a lower density of human blockages in the room, the 4-LED configuration outperforms the 8-LED configuration. However, at a higher density of human blockages in the room, the 8-LED configuration outperforms the 4-LED configuration for the same total power constraint. Hence the proposed analysis will be useful for designing a VLC based indoor communication system wherein the system designer can switch between these two configurations depending on the number of blockages.