VISIBLE LIGHT COMMUNICATION (VLC)

Visible Light Communication (VLC)

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1. Overview

Visible light communication (VLC) is a family of communication protocols which use visible light (electromagnetic radiation between 400-800THz, or 375-780nm) to transfer information. Light sources such as LEDs are used to send information, and receivers such as photodiodes, phototransistors and arrays of such (eg. cameras) are used as receivers.

2. Modulation

  • Amplitude Switch Keying (ASK)

  • Phase Switch Keying (PSK)

  • Frequency Switch Keying (FSK)

  • On-Off Keying

3. Li-Fi

Li-Fi is a VLC communication protocol which uses the ultraviolet, visible and infrared spectrum to transmit data at high speeds.


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