The effect of incident and irradiance angles in an LOS propagation model and an eye diagram of LOS/NLOS models are investigated to identify the signal distortion. The NLOS propagation model-based VLC system analyses two scenarios by considering single and dual LEDs as its transmitter. Our simulation analyzes the LOS propagation model by considering the direct path with a single LED as a transmitter. We simulated an indoor VLC system using LOS and non-line-of-sight (NLOS) propagation models. In this paper, we investigate the performance of an indoor VLC system using Optisystem simulation software. The system is economical, compact, inexpensive, small, low power, prevents radio interference, and eliminates the need for broadcast rights and buried cables. One significant advantage of the VLC system over other communication systems is that it is easy to implement using an LED and a photodiode or phototransistor. The detector receives the flashlight at high speed and decodes the transmitted data. The VLC system sends data by blinking the light at high speed, which is challenging to identify by human eyes. In VLC, the LED acts as a transmitter and sends data in the form of light when the receiver is in the line of sight (LOS) condition. The invention of the light-emitting diode (LED) significantly updated the technologies used in modern communication systems. However, the VLC system uses free space as its transmission medium. The system works the same way as optical fiber-based communication systems. Visible light communication (VLC ) is an emerging research area in wireless communication.
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