Li-Fi uses visible light communication and LED bulbs to transmit data wirelessly. It is a newer technology than Wi-Fi that provides higher speeds and more secure transmission since light cannot pass through opaque objects. Li-Fi works by switching LED bulbs on and off very fast to transmit digital signals, with photo detectors at the receiving end that translate light pulses into electronic signals. While Li-Fi has advantages over Wi-Fi like higher speeds and no radio interference, Wi-Fi currently has wider range and can be used outdoors. Li-Fi is expected to complement and eventually replace Wi-Fi for wireless internet access.

1. SAFIA
ECE Department

2. How Satellites Work
1. A Earth Station sends
message in GHz range.
(Uplink)
2. Satellite Receive and
retransmit signals back.
(Downlink)
3. Other Earth Stations
receive message in useful
strength area.
(Footprint)
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3. Source:Trimble
More than three satellites can communicate
with one device simultaneously
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4. Contents
 What is Wi-Fi technology?
 Elements of Wi-Fi technology and their operation
 Introduction of Li-Fi technology?
 History of Li-Fi technology
 How Li-Fi works for data transmission?
 Li-Fi technology v/s Wi-Fi technology
 5G communication through Li-Fi
 Conclusion
 Thanks Giving
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5. Wireless
technology
used for
connecting
devices to
internet in
wireless mode
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6. Elements of Wi-Fi Network
Access Point
Wi–Fi cards
safeguards
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7. Operation of Wi-Fi technology
 Modem signals to router
 Router amplifies signal
and transmits through
radio waves
 Range may vary from 300
feet-50 feet
 Speed ranges from 15-54
Mb/sec
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8. Introduction of Li-Fi
 Li-Fi , or light
fidelity, refers to 5G[1]
visible light
communication systems
using light from light-
emitting diodes
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9. History of Li-Fi
 Li-Fi was coined by
Harald Haas from
the University of
Edinburgh in the
UK
 Research-(2009-
2012)
 Manufacture of li-fi
kits Harald Haas
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10. Uses VLC Technology
 Visual light communication (VLC)
 Transmission rate is very high i.e. in 10Gbps
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11. Data transmission in Lifi
Model For Li-Fi
 High speed Led flickering
sends signal
 Light Receiver are special
equipments used for
detection
 Basic Medium of
transmission is light
 Hence Visual light
communication (VLC)
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12. Li-Fi technology v/s Wi-Fi technology
Li-Fi technology Wi-Fi technology
 Speed is in Gbps
 No radio interference
 Can be used
underwater, even in
airplanes
 Cannot travel through
opaque body hence highly
secure
 Speed is Mbps
 Chances of Radio
interference
 Can be used in open space
or indoors
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13. Li-Fi
technology
Replacing
wifi
The next generation
of wireless internet
could use converted
LED light bulbs to
transmit data faster
and more cheaply
than traditional Wi-
Fi signals
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14. 5G communication uses Li-fi
 We can say in future this li-fi
will take place of wifi
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15. Applications of Li-fi
Found Useful in Hospitals
Single router for all rooms in home
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16. User
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17. Thank you for watching
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18. User
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