Performance evaluation of VLC based Li-Fi Channels under the influence of Ambient Light

Abstract

Visible light communication (VLC), also known as light fidelity (Li-Fi), is the most advanced type of wireless communications that uses free space and transmits data through Light Emitting Diode (LED) or Laser Diode (LD). The advent of light emitted diodes (LED) have significantly revolutionized modern communication systems. The LED serves as a transmitter and uses light to transmit data through a range of channel configurations. The high-speed optical detector decodes the transmitted data. VLC proves to be a practical, economical, and energy-efficient option, reducing radio interference. In this study, a Non-Return-to-Zero On-Off Keying (NRZ OOK) visible light communication system is designed and simulated using a 550 nm LED and a Pin photodetector. Simulations are performed on Opti System v.20.0 software under influence of ambient light. Three different channel configurations are considered for transmitting 3 Gbps of data including Line-of-Sight (LOS), Free Space Optics (FSO), and Optical Wireless Communication (OWC), while reaching a range of up to 10 meters. The system performs best in LOS channels without and with ambient light. Without ambient light, it achieves a maximum Q factor of 7.12 with a minimum BER of 3.1 × 10-13, while with ambient light, it achieves a maximum Q factor of 6.34 with a minimum BER of 6.5 × 10-11.