li fi seminar project report docx
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A Seminar ReportOn
Li-Fi the latest technology in wireless
communication
ForThe partial fulfillment of B.tech course & as per curriculum of
West Bengal University of Technology, Kolkata (West Bengal)
Submitted by: - Pragalbh Shondilya (3061)Ravi Srivastav (3076)
Saurav Rai (3091)
Department of Electronics & Communication Engineering
Asansol Engineering CollegeAsansol (W.B.)
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Lifi: For the Cleaner, Greener and Brighter future
2013
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Lifi: For the Cleaner, Greener and Brighter future
Acknowledgement
It gives us a great pleasure in experiencing heartful thanks and
profound to Mr. Rupam Das, Assistant professor, Department ofElectronics and Communication Engineering for allowing us to takeseminar topic under their guidance. We extend our deep sense ofgratitude for his persistence encouragement, motivation andinspiration. Anything done would have been very difficult without hisvast experience, innovative ideas and thorough knowledge.
We are thankful to all our friends and teachers who have alwaysmotivated us and shown the right way to proceed in our work.
Thanks to our parent, family members and friends for theircontinuous support and encouragement to strive for our goals.
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Lifi: For the Cleaner, Greener and Brighter future
Contents
Acknowledgement_____________________________2
Abstract_____________________________________4
Introduction__________________________________5
Present Scenario______________________________7
Issues with Radio Waves_______________________7
Li-Fi as an alternative__________________________8 Light for wireless Communication_______________10
Achieving Communication through light__________11
Overcoming the issues.________________________12
Application_________________________________13
Conclusion_________________________________13
Reference__________________________________14
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Lifi: For the Cleaner, Greener and Brighter future
Abstract
hether youre using wireless internet in a coffee shop,
stealing it from the guy next door, or competing for
bandwidth at a conference, you have 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.
One German physicist, Harald Haas has come up with a solution he
calls data through illumination taking the fibber out of fiber optic
by sending data through an LED light bulb that varies in intensity
faster than the human eye can follow. Its the same idea band 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, smart phones, and tablets is transmitted through the light in
a room. And security would be snap if you cant see the light,you
cant access the data.
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Lifi: For the Cleaner, Greener and Brighter future
INTRODUCTION to Li-Fii-Fi is transmission of data through illumination by taking the
fiber out of fiber optics by sending data through a LED light
bulb that varies in intensity faster than the human eye can
follow.
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Lifi: For the Cleaner, Greener and Brighter future
At the heart of this technology is a newgeneration of high
brightness light-emitting diodes, saysHarald Haas from the
University of Edinburgh, UK.Very simply, if the LED is on, you
transmit a digital 1, if its offyou transmit a 0,Haas says, They can
be switched on and off very quickly, which gives nice opportunities
for transmitted data.
It is possible to encode data in the light by varying the rate at which
the LEDs flicker on and off to give different strings of 1s and 0s. The
LED intensity is modulated so rapidly that human eye cannot notice,
so the output appears constant.
More sophisticated techniques could dramatically increase VLC data
rate. Terms at the University of Oxford and the University of
Edinburgh are focusing on parallel data transmission using array ofLEDs, where each LED transmits a different data stream. Other
groups are using mixtures of red, green and blue LEDs to alter the
light frequency encoding a different data channel.
Li-Fi, as it has been dubbed, has already achieved blisteringly high
speed in the lab. Researchers at the Heinrich Hertz Institute in
Berlin, Germany have reached data rates of over 500 megabytes persecond using a standard white-light LED.
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Lifi: For the Cleaner, Greener and Brighter future
Present Scenario
We have 1.4million cellular mast radio waves base stations
deployed.
We also have over 5 billions of mobile phones.
Mobile phone transmits more than 600 Tb of data.
Wireless communication has become a utility like electricity &
water.
We use it in our everyday life, in our private life, business life. Currently Wi-Fi uses Radio Waves for communication.
It is important to look into this technology which has become
fundamental to our life.
Four Issues With Radio Waves
1.Capacity: Radio waves are limited.
Radio waves are scarce and expensive.
We only have a certain range of it.
With the advent of the new generation technologies like
2.5G, 3G, 4G and so on we are running out of spectrum.
2. Efficiency: There are 1.4 million cellular radio base stations.
They consume massive amount of energy.
Most of this energy is not used for transmission but for
cooling down the base stations.
Efficiency of such a base station is only 5%.
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Lifi: For the Cleaner, Greener and Brighter future
3. Availability: Availability of radio waves is another cause of concern.
We have to switch off our mobiles in aero planes. It is not advisable to use mobiles at places like
petrochemical plants and petrol pumps.
4. Security: Radio waves penetrate through walls.
They can be intercepted.
If someone has knowledge and bad intentions then hemay misuse it.
Alternative to Radio Waves in
Electromagnetic Spectrum
There are four major concerns i.e., capacity, efficiency,
availability and security related with Radio waves.
But on the other hand we have 40 billions of light box already
installed and light is the part of electromagnetic spectrum.
So lets look up at this in context of EM spectrum.
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Gamma rays are simply very dangerous and thus cant be used for our
purpose of communication.
X-rays are good in hospitals and cant be used either.
Ultra-violet rays are good for getting a sun-tan but exposure for long
duration is dangerous.
Infrared rays are bad for our eyes and are therefore used at low power
levels.
We have already seen the shortcomings of Radio waves.
So we are left with only Visible Light Spectrum.
Also if we see the spectrum band of visible light than we will find that it is 10000 timesmore than that of radio waves.
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Lifi: For the Cleaner, Greener and Brighter future
Light for Wireless Communication
Light has been around for millions of years.
It has created us created life and has created all stuffs of life.
Visible light Communication (VLC) uses rapid pulses of light to
transmit information wirelessly. Now it may be ready to compete
with conventional Wi-Fi.
So it is inherently safe to use for wireless communication.
What we have to do?
We have to replace inefficient fluorescents with this new
dignitary of LED lights.
The LED will hold a micro-chip that will do the job of processing
the data.
Light intensity can be modulated at very high speeds to send
data by tiny changes in amplitude.
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Lifi: For the Cleaner, Greener and Brighter future
Achieving Communication through Light
ets start with the foremost communication device which
everyone has in their homes i.e., a Remote Control. A remote
control has an Infrared-LED. It creates a single data stream
and the data rate achieved is around 10000b/s to 20000b/s. Now if
we replace the remote control with a light box, we are able to
transmit 1000s of data stream in parallel at high speeds. This
technology is termed as Spatial Modulation.
Remote Control Data via LED
Is it a Proven Technology?
Yes, this is already proven.
Harald Haas demonstrated his invention using an ordinary table
lamp that successfully transmitted data at speeds exceeding 10Mbps
using light waves from LED light bulbs to a computer located below
the lamp.
To prove that the light bulb was the source of the data stream, he
periodically blocked the beam of light, causing the connection to
drop.
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Overcoming the four issues with RW in Li-
Fi
1.Capacity: 10000 times more spectrum than RW.
LEDs are already present.
So we have the infrastructure available and already
installed.
2.Efficiency:
Data through illumination and thus data transmissioncomes for free.
LED light consumes less energy
Highly efficient
3.Availability
Light is present everywhere.
4.Security:
Light waves dont penetrate through walls.
Cant be intercepted & misused.
Data is present where there is light.
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Applications of Li-Fi
At present its applications are beyond imagination but still if to think about few thenthey are:
Can be used in places where it is difficult to lay the optical fiber
like hospitals. In operation theatre Li-Fi can be used for modern
medical instruments.
In traffic signals Li-Fi can be used which will communicate with
LED lights of the cars and accident numbers can be decreased.
Thousand and millions of street lamps can be transferred to Li-Fi Lamps to transfer data.
In aircraft Li-Fi can be used for data transmission.
It can be used in petroleum or chemical plants where other
transmission or frequencies could be hazardous.
Conclusion
he possibilities are numerous and can be explored further. Ifthis technology can be put into practical use, every bulb can beused something like a Wi-Fi hotspot to transmit wireless data
and we will proceed toward the cleaner, greener, safer and brighterfuture. The concept of Li-Fi is currently attracting a great deal ofinterest, not least because it may offer a genuine and very efficientalternative to radio-based wireless. As a growing number of peopleand their many devices access wireless internet, the airwaves are
becoming increasingly clogged, making it more and more difficult toget a reliable, high-speed signal. This may solve issues such as theshortage of radio-frequency bandwidth and also allow internet wheretraditional radio based wireless isnt allowed such as aircraftorhospitals. One of the shortcomings however is that it only work indirect line of sight.
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Lifi: For the Cleaner, Greener and Brighter future
REFERENCES
http://en.wikipedia.org/wiki/Li-Fi http://teleinfobd.blogspot.in/2012/01/what-is-lifi.html
www.lificonsortium.org/
Will Li-Fi be the new Wi-Fi?, New Scientist, by Jamie Condliffe,
dated 28 July 2011
http://www.digplanet.com/wiki/Li-Fi
Visible-light communication: Tripping the light fantastic: A
fast and cheap optical version of Wi-Fi is coming, Economist,dated 28Jan 201