Hey guys this ppt is all about lifi presentation. you can refer this presentation as your project . this is our final presentation.

1. Bharadwaj Hetashree P. (2013_415)
Kumar Sagar D. (2013_441)
Soni Himesh N. (2013_481)

2. Index
1. Abstraction
2. History
3. LI-FI Genesis
4. Introduction
5. Definition
6. Video of LI-FI
7. Electro Magnetic Spectrum
8. Features
9. LI-FI Technology
10. Architecture of LI-FI
11. LI-FI Environment
12. Working Process
13. Future Enhancement
14. Types Of LI-FI
15. Comparisons
16. Applications
17. Merits
18. De-Merits
19. Conclusion
20. References

3. Abstract
When you are using wireless internet in a coffee shop, stealing it from the guy next door,
or competing for bandwidth at a conference, you’ve probably gotten frustrated at the slow
speeds you face when more than one device is tapped into the network. As more and
more people and their many devices access wireless internet, clogged airwaves are going
to make it increasingly difficult to latch onto a reliable signal. But radio waves are just one
part of the spectrum that can carry our data. What if we could use other waves to surf the
internet? One German physicist, DR. Harald Haas, has come up with a solution he calls
“Data Through Illumination”—taking the fiber out of fiber optics by sending data
through an LED light bulb that varies in intensity faster than the human eye can follow.
It’s the same idea behind infrared remote controls, but far more powerful. Haas says his
invention, which he calls D-Light, can produce data rates faster than 10 megabits per
second, which is speedier than your average broadband connection. He envisions a future
where data for laptops, smartphones, and tablets is transmitted through the light in a
room. And security would be a snap—if you can’t see the light, you can’t access the data.

4. History
In Older Days
Wired Networking
Satellites Communication
Wireless Networking

5. Li-Fi Genesis
 Harald Haas, a professor at the University of Edinburgh who began his research in the
field in 2004, gave a first demonstration of what he called a Li-Fi prototype at the TED
Global conference in Edinburgh on 12th July 2011.
 He used a table lamp with an LED bulb to transmit a video of blooming flowers that
was then projected onto a screen behind him.
 During the event he periodically blocked the light from lamp to prove that the lamp
was indeed the source of incoming data.
 At TED Global, Haas demonstrated a data rate of transmission of around 10Mbps --
comparable to a fairly good UK broadband connection. Two months later he achieved
123Mbps.

6. Introduction
 One germen phycist. Harald Haas has come up
with a solution calls Li-Fi.
 Li-Fi can be thought of as a light based Wi-Fi.
That is, it uses light instead of radio waves to
transmit information.
 “Data through Illumination” D-light taking the
fiber out of fiber optic by sending data through
an LED light bulb that varies in intensity faster
than the human eye can follow.

7. Definition
Li-Fi is transmission of data through Illumination, I.e.
sending data through LED light bulbs
Li-Fi stands for Light Fidelity.

8. Video Of Li-Fi

9. Electro Magnetic Spectrum

10. Features

11. Capacity
Bandwidth: The visible light spectrum is plentiful (10,000 more than RF
spectrum), unlicensed and free to use.
Data density: Li-Fi can achieve about 1000 times the data density of Wi-Fi
because visible light can be well contained in a tight illumination area whereas
RF tends to spread out and cause interference.
High speed: Very high data rates can be achieved due to low interference, high
device bandwidths and high intensity optical output.
Planning: Capacity planning is simple since there tends to be illumination
infrastructure where people wish to communicate, and good signal strength can
literally be seen.

12. Efficiency
Low cost: Requires fewer components than radio technology.
Energy: LED illumination is already efficient and the data
transmission requires negligible additional power.
Environment: RF transmission and propagation in water is
extremely difficult but Li-Fi works well in this environment.

13. Safety
Safe: Life on earth has evolved through exposure to visible light.
There are no known safety or health concerns for this technology.
Non-hazardous: The transmission of light avoids the use of
radio frequencies which can dangerously interfere with electronic
circuitry in certain environments.

14. Security
containment: It is difficult to eavesdrop on Li-Fi signals since the signal is
confined to a closely defined illumination area and will not travel through walls.
Control: Data may be directed from one device to another and the user can see
where the data is going; there is no need for additional security such as pairing for
RF interconnections such as Bluetooth.

15. Li-Fi Technology
 Li-Fi means “Light Fidelity”.
 It is possible to encode data in the light by varying the rate at
which the LEDs flickers ON and OFF to give different strings
of 1’s & 0’s

16. Architecture Of Li-Fi

17. Li-Fi Environment

18. Working Process
 Li-Fi offers an integrated light source that is straight forward to
Integrated into a projector. In this example LIFI consists of 5 primary
Sub-assemblies:
 Printed circuit board (PCB)
 RF power amplifier (PA)
 Bulb
 Optic
 Enclosure

19. Future Enhancement
Using an array of LEDs for parallel data transmission or using mixture of red, green
and blue LEDs to alter the light’s frequency with each frequency encoding a different
data channels.
Such advancements promise a theoretical speed of 10 Gbps
It means that one can download a full high definition
film in just 30 seconds.

20. Types Of Li-Fi

21. Comparison

22. Application
There are numerous applications of this technology, from public internet access
through street lamps to auto-piloted cars that communicate through their
headlights.
 In RF Restricted Environment
 In Hospitals
 Street Lamps
 In Aircraft
Under water etc.

23. In RF Restricted Environment

24. In Hospitals

25. Street Lamps

26. In Aircraft

27. Under water

28. Merits
 High Security
 Easy to use
 Fast data transfer
 Harmlessness

29. De-Merits
 High installation cost of the VLC communication.
 Interferences from external light sunlight, normal
Bulbs in the path of transmission will cost
interruption in the communication

30. Conclusion
 If this technology can be put into practical use, every bulb can be used
something like a Wi-Fi hotspot to transmit wireless data and we will proceed
toward the cleaner, greener, safer and brighter future.
 The concept of Li-Fi is currently attracting a great deal of interest, not
least because it may offer a genuine and very efficient alternative to radio-
based wireless.
 As a growing number of people and their many devices access wireless
internet, the airwaves are becoming increasingly clogged, making it more and
more difficult to get a reliable, high-speed signal.
 This may solve issues such as the shortage of radio-frequency bandwidth
and also allow
 internet where traditional radio based wireless isn’t allowed such as aircraft
or hospitals. One of the shortcomings however is that it only work in direct line
of sight.

31. References
1)http://www.lifi.com/pdfs/techbriefhowlifiworks.pdf
2)http://www.ripublication.com/ijaer.html
4) http://en.wikipedia.org/wiki/Li-Fi
5) seminarprojects.com/s/seminar-report-on-lifi