light Fidelity by Harikiran Shetty Manipal University

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Presented by Harikiran Shetty 141024030 Msc.Tech VLSI

( Future is here )

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.

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.

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

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)

ADVANTAGES OF LI-FI

High security

Availability

Efficiency

Faster data transfer

Harmless

Low-cost13

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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