I took information from others website and ppt file and just modify this ppt file. I hope it will be easy to understand. Thank you.

1. PRESENTATION ON
LI-FI Technology
KHULNA UNIVERSITY, BANGLADESH
Welcome to my presentation
Submitted to:
Dr. Mohammad Ismat Kadir
&
Dr. Md. Maniruzzaman
Professor,
Electronics and Communication
Engineering Discipline, Khulna
University, Khulna 9208,
Bangladesh
Presented by:
Md. Shahin Kadir
Student ID: 120933
4th year, 2nd term
Electronics and Communication
Engineering Discipline, Khulna
University, Khulna 9208,
Bangladesh
11/12/2016
1

2. What is LI-FI?
KHULNA UNIVERSITY, BANGLADESH
LI-FI – LIGHT FIDEALITY
LI-FI is transmission of data through
illumination, sending data through a
LED light bulb that varies in intensity
faster than human eye can follow.
11/12/2016 2

3. History
KHULNA UNIVERSITY, BANGLADESH
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 wow the world with the
potential to use light for
communication.
11/12/2016 3

4. KHULNA UNIVERSITY, BANGLADESH11/12/2016 4

5. PRESENT SCENARIO
KHULNA UNIVERSITY, BANGLADESH11/12/2016 5
Radio Spectrum is
congested but the
demand for
wireless data
double each year
.Every thing, it
seems want to use
wireless data but
the capacity is
drying up.

6. Issues regarding Radio spectrum
KHULNA UNIVERSITY, BANGLADESH11/12/2016 6

7. Electromagnetic Spectrum
KHULNA UNIVERSITY, BANGLADESH11/12/2016 7

8. WHY ONLY VLC ?
KHULNA UNIVERSITY, BANGLADESH11/12/2016 8
Radio
waves
Infrared
Rays
Visible
Rays
Ultravio
let Rays
X- Rays
Gama
Rays
 Gama rays cant be used as they could be
dangerous.
X-rays have similar health issues.
Ultraviolet light is good for place
without people, but other wise dangerous
for the human body.
Infrared, due to eye safety regulation,
can only be used with low power.

9. KHULNA UNIVERSITY, BANGLADESH11/12/2016 9
WHO CAN REPLACE
RADIO WAVES FOR WIRELESS
COMMUNICATION
?

10. KHULNA UNIVERSITY, BANGLADESH11/12/2016 10

11. Basic concepts
KHULNA UNIVERSITY, BANGLADESH11/12/2016 11
LED (Light emitting diode) can be switched on
and off faster since operating speed of LED is
less than 1 μs, than the human eye can detect,
causing the light source to be appear
continuously. This invisible on-off activity
enables a kind of data transmission using binary
codes. Switching on and LED is a logical ‘1’,
switching it off is a logical ‘0’.It is possible to
encode data in the light by varying the rate at
which LED’s flicker on and off to give different
strings of 1s and 0s. Modulation is so fast that
human eye doesn’t notice.

12. How LI-FI Works ?
KHULNA UNIVERSITY, BANGLADESH11/12/2016 12
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. We have to just vary the rate at which the LED’s
flicker depending upon the data we want to encode
Thus every light source will works
as a hub for data transmission.

13. How LI-FI Works ?
KHULNA UNIVERSITY, BANGLADESH11/12/2016 13

14. How LI-FI Works ?
KHULNA UNIVERSITY, BANGLADESH11/12/2016 14

15. How LI-FI Works ?
KHULNA UNIVERSITY, BANGLADESH11/12/2016 15
On one end all the data on the internet will
be streamed to a lamp driver when the led is
turned on the microchip converts the digital
data in form of light.
A light sensitive device (photo detector)
receives the signal and converts it back into
original data. This method of using rapid
pulses of light to transmit information
wirelessly is technically referred as Visible
Light Communication.

16. How LI-FI Works ?
KHULNA UNIVERSITY, BANGLADESH11/12/2016 16
Further enhancements can be made in this method, like using an array of
LEDs for parallel data transmission, or using mixtures of red, green and
blue LEDs to alter the light‘s frequency with each frequency encoding a
different data channel. Such advancements promise a theoretical speed of
10 Gbps – meaning one can download a full high-definition film in just
30 seconds.

17. LI-FI Models
KHULNA UNIVERSITY, BANGLADESH11/12/2016 17
Giga mimo
Giga
shower
For giga-speed technologies, the Li-Fi Consortium defined
GigaShower, GigaSpot and GigaMIMO models.

18. LI-FI Models
KHULNA UNIVERSITY, BANGLADESH11/12/2016 18
GigaShower and Giga-MIMO are the other
models for in-house communication. There
a transmitter or receiver is mounted into the
ceiling connected to, for example, a media
server.
GigaShower provides unidirectional data services via several channels to
multiple users with gigabit-class com-munication speed over several metres.
This is like watching TV channels or listening to different radio stations where
no uplink channel is needed. In case GigaShower is used to sell books, music
or movies, the connected media server can be accessed via Wi-Fi to process
payment via a mobile device. GigaSpot and GigaMIMO are optical wireless
single- and multi-channel HotSpot solutions offering bidirectional gigabit-class
communication in a room, hall or shopping mall for example.

19. LI FI CONSTRUCTION
KHULNA UNIVERSITY, BANGLADESH11/12/2016 19
The LI FI product
consists of 4 primary
sub-assemblies:
• Bulb
• RF power amplifier
circuit (PA)
• Printed circuit board
(PCB)
• Enclosure

20. LI-FI VS WI-FI
KHULNA UNIVERSITY, BANGLADESH11/12/2016 20

21. POTENTIAL APPLICATION OF LI-FI
KHULNA UNIVERSITY, BANGLADESH11/12/2016 21
TRAFFIC LIGHTS:
Traffic lights can communicate to the car and with each other. Cars
have LED-based headlights, LED-based cack lights, and cars can
communicate with each other and prevent accidents in by
exchanging information.

22. POTENTIAL APPLICATION OF LI-FI
KHULNA UNIVERSITY, BANGLADESH11/12/2016 22
Airlines:
On aircraft, Li-Fi enabled lighting will allow high data rate
connectivity for each passenger. It will allow connectivity at all times,
without creating electromagnetic interference (EMI) with sensitive
radio equipment on the flight deck.

23. POTENTIAL APPLICATION OF LI-FI
KHULNA UNIVERSITY, BANGLADESH11/12/2016 23
ON OCEAN BEDS:
Li-Fi can even wok underwater were Wi-Fi fails completely, thereby
throwing open endless opportunities for military/navigation
operations.

24. POTENTIAL APPLICATION OF LI-FI
KHULNA UNIVERSITY, BANGLADESH11/12/2016 24
COSTS:
It will reduce your
electricity bill
and maintenance
costs.

25. POTENTIAL APPLICATION OF LI-FI
KHULNA UNIVERSITY, BANGLADESH11/12/2016 25
Street lamps (As free access points )
There are millions of street lamps deployed around the world.
Each of these street lamps could be a free access point.

26. POTENTIAL APPLICATION OF LI-FI
KHULNA UNIVERSITY, BANGLADESH11/12/2016 26
SECURITY
The overall net benefit to each user is up to 1000 times greater speeds. In addition,
and in contrast to radio waves, the light does not pass through the walls. Therefore,
with minimal precautions to avoid leakage from windows, etc., security is
fundamentally enhanced as compared with Wi-Fi.

27. POTENTIAL APPLICATION OF LI-FI
KHULNA UNIVERSITY, BANGLADESH11/12/2016 27
Dense urban environments
Dense urban environments by their nature
tend to have complete artificial lighting
coverage. This lighting infrastructure can
provide always available high data rate
access for users as they move through that
environment.
Hospital
Hospitals are a specific case of an
environment where both EMI sensitivity and
security of data are issues. Li-Fi can enable
the better deployment of secure networked
medical instruments, patient records, etc.

28. Limitations 0r challenges
KHULNA UNIVERSITY, BANGLADESH11/12/2016 28
Light can't pass through objects

29. Limitations 0r challenges
KHULNA UNIVERSITY, BANGLADESH11/12/2016 29
High installation cost of the VLC systems

30. Limitations 0r challenges
KHULNA UNIVERSITY, BANGLADESH11/12/2016 30
Interferences from external light sources like sun
light, normal bulbs, and opaque materials in the
path of transmission will cause interruption in the
communication.
A major challenge facing Li-Fi is how the
receiving device will transmit back to
transmitter.

31. CONCLUSION
KHULNA UNIVERSITY, BANGLADESH11/12/2016 31
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.

32. REFRENCES
KHULNA UNIVERSITY, BANGLADESH11/12/2016 32
http://www.lifi-centre.com
https://en.wikipedia.org/wiki/Li-Fi
http://www.techworld.com/big-data/what-is-li-fi-
everything-you-need-know-3632764/
http://www.ibtimes.com/what-li-fi-meet-revolutionary-
wireless-technology-100-times-faster-wi-fi-2199883
http://www.engpaper.net/li-fi.htm

33. KHULNA UNIVERSITY, BANGLADESH11/12/2016 33

34. ANY QUERIES ?
KHULNA UNIVERSITY, BANGLADESH11/12/2016 34