Enhancement of Received Power Distribution of a Non-Directed Los Indoor Visible Light Communication System

Abstract

Visible light communication uses the visible light portion of the electromagnetic spectrum to achieve communication with light as the carrier of information and optical power is received at the receiver. The received power distribution uniformity may sometimes be inefficient or traded off with maximum received power, this problem then inhibits communication quality in a receiving plane for visible light communication in an indoor environment due to power fluctuation. A novel way of arranging 9 transmitters is presented in this work based on non-direction line of sight VLC. The Visible light communication system for an indoor environment here is hence, both in terms of line of sight and non-light of sight scenarios. Using a model of VLC system which includes the transmitter, receiver, room and signal propagation, the received power is simulated jointly for both scenarios to produce a received power distribution across a communication environment. The simulations were carried out considering two separate 9-transmitters configurations of which one is a conventional arrangement and the other is the novel arrangement presented in this work. MATLAB was used for the simulations and the results were compared and analysed. The novel transmitter configuration was found to have better received power distribution by 9% without diminishing the maximum received power where there is high probability of having a receiver. The maximum received power was actually even improved from 2.38 mW to 2.44 mW. The results of the novel configuration can lead to reduction in power fluctuation within a communication environment and improve mobility