Exploration of Visible Light Communication in an Indoor Location Using LED Array Distribution

Abstract

Visible Light Communication (VLC) is a ubiquitous communication method that enables Lighting-Emitting Diodes (LEDs) to be used as illumination and for data transfer in wireless connections. Previous researchers have focused  to infrared channel modelling. This research explores the use of VLC indoors and demonstrates its advantages over radio frequency (RF) communications, especially in restricted areas like laboratories, hospitals, aircraft, and houses. Since RF can be hazardous to human health, VLC offers a safer alternative with a higher data rate for multimedia applications.  This work, uses an uncovered room as a case study for indoor VLC broadband communication. Eight symmetrically positioned light-emitting diodes (LEDs) on the ceiling as transmitters and a photodiode on the floor acts as a receiver to assess the level of lighting, optical power, and Signal-to-Noise Ratio (SNR) distribution. The computation was performed using the MATLAB software. Results showed that when the LED's half-power semi-angle (ϕ1/2) ranges from 25° to 65°, the average lighting ranges from 600 (lx) to 800 (lx), respectively. However, a signal power of 23 dBm and an SNR of 60 dB  at (ϕ1/2) = 65° are sufficient for communication and illumination, while average power of 10 dBm and SNR of 20 dB at (ϕ1/2) = 15° are insufficient for the transmission of data in the room.
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