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This is a technical persentation about Li-fi Technology, hope it will help you enhance your knowledge.
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HOW WE ARE CONNECTED TO INTERNET Wired•Dial-up •DSLWireless•Broadband (evo)•Satellite•Wi-Fi
PRESENT SCENARIO
1.4 Million 5 Billion
ISSUES REGARDING RADIO SPECTRUM
WHO CAN REPLACE RADIO WAVES FOR WIRLES COMMUNICATION ?
WHAT IS LI – FI ?•transmission of data through illumination •LED light bulb
HISTROY
• The technology began during the 1990‘s.
• Coined by Edinburgh University's Prof Harald Haas.
HARALD HASS
WORKING PRINCIPLE
• LED switch on/off• Require LED and controller to code data into LED.
WORKING PRINCIPLE
Radio Waves
Infrared Rays
Visible
Rays
Ultraviolet Ray
s
X- Rays
Gama Rays
HENCE WE LEFT WITH THE ONLY THE VISIBLE - LIGHT SPECTRUM.
WHY VLC ONLY ?
LI-FI•Light power(LED)•Multiple data stream•High speed•Technologies used in LI-FI: SIM-OFDM and Spatial modulation
LI-FI
DIFFERNCE BETWEEN TECHNOLOGIES
POTENTIAL APPLICATION OF LI-FI
TRAFFIC LIGHTS
INTRINSICALLY SAFE ENVIRONMENTS
POTENTIAL APPLICATION OF LI-FI
PUBLIC INTERNET HOTSPOTS
POTENTIAL APPLICATION OF LI-FI
ON OCEAN BEDS
POTENTIAL APPLICATION OF LI-FI
ADVANTAGES
• Larger bandwidth (10,000 times the radio bandwidth)
• High efficiency• More availability• Highly secure
DISADVANTAGE
• Presence of Light is essential
CONCLUSION
The possibilities are numerous and can be explored further. If this technology can be put into practical use , every bulb can be used something like a Wi-Fi hotspots to transmit wireless data.
REFERENCES:• [1] anyfi.net/documentation
• [2] www.independent.co.uk/news/science/lifi-revolution-internet-connections-using-light-bulbs-are-250-times-faster-than-broadband-8909320.htm
• [3] http://www.extremetech.com/extreme/147339-micro-led-lifi-where-every-light-source-in-the-world-is-also-tv-and-provides-gigabit-internet-access
THANK YOUAny Query
