LiFi Technology

2. Date:27/04/2015
Silent Assassins
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LIFI-TECHNOLOGY

3. Today’s Major Data Transmission
Technique
❖ Today’s majority of data technique uses
Radio Spectrum .
❖ Drawbacks of Radio Spectrum
● The fact that it is congested and the demand
for wireless data double each year.
● Every thing , it seems want to use wireless
data but the capacity is drying up.

4. ● Availability :It is available within the range of
Base stations and unavailable in aircrafts.
● Efficiency: Consumes huge amount of
energy for transmitting radio waves and to
cool the base station cabins
● Security: Less secure as it can also pass
through walls.

5. What is LI-FI
● LI-FI stands for “Light Fidelity”.
-It is the transmission of data through
illumination.
-Sending data through a Light Emitting Diode
which varies in intensity faster than human
eye can follow to deliver high speed data
transmission.

6. History
● 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.
● Harald Haas continues to the
world with the potential to use
light for communication.

7. Introduction
● It is a Visible Light Communication(VLC)
technology developed by scientists including
Dr. Gorden Povery, Prof Harald Hass and
Dr. Mostafa Afgani at University of
Edinburgh .
● These devices are normally used for
illumination by applying a constant current
through the LED.
● Li-fi is the term used for fast and cheap light
based Wi-Fi but it uses light rather than radio
waves.

8. Availability of Medium

9. How LiFi Works
● operational procedure is very simple, if the
led is on, you transmit a digital 1, if its off
you transmit a 0.
● The LEDs can be switched on and off very
quickly, which gives nice opportunities for
transmitting data.
● Hence all that us required is some LEDS
and a controller that code data into those
LEDs.

12. How LiFi is Different from Others?
● Li-fi is based on LEDs for the transfer of data.
● The transfer of data can be with the help of all
kinds of light ,no matter the part of spectrum
that they belong to.
● The speed of the internet is incredibly high and
one can download movies ,games ,etc. in just a
few minutes.
● It also removes the limitation to be in a region
where Wi-Fi is only present.

13. LiFi vs WiFi

14. Various Transmitting Elements
● Light emitting diodes
● Study lamps
● LED lamps

15. Various Receiving Elements

16. Potential Applications of LiFi
1.In House Communication :Giga shower
● For giga speeds technologies ,the Li-fi consortium has
defined Giga Shower ,Giga MIMO and Giga Spot.
● It provides bidirectional data services via several
channels to multiple users.
● This is like watching TV channels or listening to
different radio stations where no uplink channel is
needed.

18. 2.Traffic Lights
● Traffic lights can communicate to each other and
vehicles.
● Cars ,Traffic lights and other vehicles too have LED-
based headlights so data can be easily transmitted to
each other.

19. 3.In Aircraft cabins
● This is one of the advantage of li-fi as it could be
used in aircrafts because Wi-Fi can not be used
there.

20. 4.Hospitals
● In hospitals li-fi can be used in those instruments
which are capable of light emitting and used for
data transmission.

21. 6.Street lamps as free access points
● As there are million of street lamps deployed each
of them can be used as free access points for
internet and fast data transmission also.

22. Advantages of LiFi
➔ Higher Bandwidth (almost 10000 times more)
➔ Availability
➔ Efficiency
➔ High Security
➔ Easy to use
➔ Fast data transfer
➔ Harmless
➔ Low cost
➔ High capacity

23. Limitations infront of LiFi
➢Light can not pass through objects.
➢A major challenge facing Li-fi is how the
receiving device will transmit back to the
transmitter.
➢High initial cost of VLC systems.
➢Interferences from external light sources like
sun ,normal lights and opaque materials.

24. LiFi Equipment
● PureLiFi demonstrated the
first commercially available
Li-Fi system, the Li-1st, at
the 2014 Mobile World
Congress in Barcelona.
● The product offers full
duplex communication with
a capacity of 5Mbps in both
the downlink and uplink
over a range of up to three
metres.
● Li-1st offers a simple plug-and-play solution for secure
wireless point-to-point Internet access with a wide range of
LED luminaires.

26. Further Enhancements
● Further enhancements can be made in this like
using an array of LEDs for parallel data
transmission or mixtures of red , green and blue
LEDs to alter the light’s frequency encoding a
different channel.
● Such development promise a theoretical speed
of 10 Gbps-meaning one can download a full
high-definition film in just few seconds.

27. Conclusion
❖ The possibilities are numerous and can be
explored further.
❖ If this technology can be used to practicality
,every bulb can be used for something like a
Wi-Fi hotspots to transmit wireless data.

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