Light fidelity (li fi) final ppt
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Li-Fi is a wireless communication technology that uses visible light communication to transmit data using light-emitting diodes (LEDs). It provides high-speed communication in a similar manner to Wi-Fi but avoids issues with radio frequency bands having limited availability, security, and capacity. Li-Fi was originally proposed by Professor Harald Haas from the University of Edinburgh in 2011 and research has expanded globally since the 1990s, though it has limitations around line of sight transmission and interference from other light sources.
Light fidelity (li fi) final ppt
- 2. • Present Usage of Communication • Electromagnetic spectrum • What is Li-Fi? • History • Working principle • Applications • Limitations • Conclusion Contents:
- 3. • The Need of wireless data has been increasing day by day in this modern world. • The major source used for wireless transmission is Radio frequency. Present usage of communication: 1.4 Million Base Stations 5 Billion
- 6. What is Li-Fi? • Li-Fi, or light fidelity, is 5G visible light communication systems using light from light-emitting diodes(LEDs) as a medium to deliver networked, mobile, high-speed communication in a similar manner as Wi-Fi and Optical fiber. • Visible light communications (VLC) signals work by switching bulbs on and off within nanoseconds , which is too quick to be noticed by the human eye.
- 7. History: • Professor Harald Haas, from the University of Edinburgh in the UK, is widely recognized as the original founder of Li-Fi • Research has been going on in all the developed countries from 1990, but Dr. Harald has stunned the world when he presented on Li-Fi during Global Ted talk 2011.
- 17. LIMITATIONS & CHALLENGES • Interferences from external light sources like sun light, normal bulbs, and opaque materials in the path of transmission will cause interruption in the communication. • Li-Fi requires line of sight. • High installation cost of the VLC systems. • A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter.
- 18. CONCLUSION BROWSE DATA WITH SPEED OF LIGHT