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Presented by Harikiran Shetty 141024030 Msc.Tech VLSI
( Future is here )
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TOPICS FOR TODAY
Introduction Why Li-Fi ? History How Li-Fi works? Comparison b/w Different Techs. Advantages Disadvantages Challenges Applications Conclusions References
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INTRODUCTION Li –Fi is “ transmission of data through illumination of
light, i.e. sending data through a LED bulbs that vary in intensity faster than human eye can follow”.
Li-Fi is the the fast and cheap wireless-communication system.
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WHY LI-FI WHEN WE HAVE WI-FI?
We need faster data rate.
Wireless data is growing exponentially leading to RF spectrum shortage.
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HISTORY OF LI-FI
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Professor Harald Haas from the University of Edinburgh is the founder ofLi-Fi. in in TED global talk in 2011.
Professor Harald Haas from the University of Edinburgh coined the term Li-Fi in TED global talk in 2011.
In April 2014, the Russian company Stins Coman announced the development of a Li-Fi wireless local network called “Beam Caster”.
The Li-Fi Consortium has proven that 10gbps data rate is possible by Li-Fi technology.
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HOW LI-FI WORKS? If the LED is on, transmit a digital 1, if it's off then
transmit a digital 0.
Flickering rate is very high.
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CONTD…
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LI-FI CONSTRUCTION
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LI-FI BULB SUB ASSEMBLY
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A sealed bulb (LED) is embedded in a dielectric material.
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CHALLENGING PROBLEMS Connectivity
This problem is similar to the connectivity problem in cellular network when you move from one area of the city to another area while speaking with cell-phone.
The solution is called “handover”, using which the user is transferred from one BS to another . 10
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CONTD.. Multiuser support
Solution is time division multiplexing (TDM). Each frame is divided into equal time slots. Each user transmit data in one time slot in a predefined order.
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COMPARISON B/W DIFFERENT TECHNOLOGIES
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Fire wire 800 Mbps
USB 3.0 5 Gbps
Thunderbolt 20 Gbps
Wi-Fi 150 Mbps
Bluetooth 25Mbps
IrDA 4Gbps
Li-Fi 10Gbps
Giga-IR 1Gbps
Wired
Wireless (Current)
Wireless (Future)
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ADVANTAGES OF LI-FI
High security
Availability
Efficiency
Faster data transfer
Harmless
Low-cost13
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DISADVANTAGES OF LI-FI
Light can't pass through objects.
Line of sight is needed.
Li-Fi doesn’t work in the dark or outdoors.
Difficult to achieve Bi-directional Capability.
High installation cost of the VLC systems.
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APPLICATIONS OF LI-FI Hospitals
Sensitive Areas
Education Systems
Airlines
Traffic Signals
Underwater Applications
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CONCLUSION
Li-fi is the optical version of Wi-Fi.
Every bulb can be used something like a Wi-Fi hotspot to transmit wireless data .
Cleaner, Greener, Safer and Brighter future.
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REFERENCES (Light Fidelity)-The future technology In Wireless
communication International Journal of Applied Engineering Research, ISSN 0973-4562 Vol.7 No.11 (2012).
A survey on Transmission of data through illumination - Li-Fi International Journal of Research in Computer and Communication Technology, Vol 2, Issue 12, December- 2013
http://www.digitaltrends.com/mobile/light-bulb-li-fi-wireless-internet/
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