This presentation is about Li-Fi technology

1. Li-Fi Technology

2. 2
Submitted to
Nahar Sultana
Assistant Professor,
Department of Computer Science
American International University-Bangladesh
Submitted by
1. CHAKMA, JYOTI BASU 15-28558-1
2. IQBAL, ASIF 15-28730-1
3. RUMEL, ABU HUMAYED 15-28983-1
4. KHAN, MD. TASDIKUL ISLAM 15-29210-1
5. MAZBA, AL NOOR TURZA 15-29250-1

3. Motivation
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 20 billion IoT devices by the year 2020
 Wi-Fi uses radio frequencies
 Internet everywhere

4. Contents
◇ Introduction
◇ Background
◇ Working Principles
◇ Practical Uses
◇ Li-Fi vs Wi-Fi
◇ Limitations
◇ Future Possibilities
◇ Conclusion
◇ References
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5. Introduction
 Light Fidelity (Li-Fi) is a bidirectional, high-speed and
fully networked wireless communication technology.
 Li-Fi is transmission of data through illumination,
sending data through a LED light bulb that varies
intensity faster than human eye can follow.
 It is wireless and uses visible-light communication or
infrared and near-ultraviolet instead of radiofrequency
spectrum, part of optical wireless communications
technology.
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6. Background
The technology truly began
during the 1990's in
countries like Germany,
Korea and Japan where
they discovered LED's
could be retrofitted to send
information. Li-Fi coined by
Prof. Harald Haas during
his TED Global talk, is
bidirectional, high speed
and fully networked
wireless communications
similar to Wi-Fi.
2
Prof. Harald Haas
University of Edinburgh

7. Working Principles
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8. Practical Uses
 Traffic Lights:
Traffic lights can
communicate to
the car and with
each other. Cars
have LED based
headlights. Cars
can communicate
with each other
& and prevent
accidents in by
exchanging
information.
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9. Practical Uses
 Health sector: Since WI-FI is not safe to be used in
hospitals and other various health care sectors because
it penetrates human body. Li-Fi can be implemented
and well suit in this sector.
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10. Practical Uses
 Airlines: Whenever
we travel through
airways we face
the problem in
communication
media because the
whole airways
communication
are performed on
the basis of radio
waves. To
overcome this
drawback, Li-Fi is
introduced.
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11. Practical Uses
 Underwater communications: Since radio waves cannot
be used under water because these waves are strongly
absorbed by sea water within feet of their transmission
and this renders it unusable underwater but Li-Fi is
suitable for underwater communication.
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12. Practical Uses
 Internet
anywhere: street
lamps, light of
vehicles can be
used to access
internet
anywhere in
footpaths,
roads, malls,
anywhere where
light source is
available.
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13. Li-Fi vs Wi-Fi
 Carrier
 Cost
 Frequency
 Health Issues
 Range
 Security
 Speed
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14. Limitations
 Light cannot pass through objects.
 Interferences from external light sources.
 Li-Fi range is limited.
 High installation cost of the VLC systems.
 Light should be always on which is disturbing to
eyes.
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15. Future Possibilities
 Modulated light can still be detected in daylight.
 Intensity of the light can be changed at night.
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16. Conclusions
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.
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17. References
 https://www.lifi.eng.ed.ac.uk/
 https://purelifi.com/technology/
 http://www.lighting.philips.com/main/products/lifi
 https://www.fastcompany.com/90164732/what-
is-li-fi-the-new-alternative-to-wi-fi
 https://www.techworld.com/data/what-is-li-fi-
everything-you-need-know-3632764/
 http://www.rfwireless-
world.com/Terminology/What-is-Solar-LiFi.html
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18. Thanks!
Any questions?
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