1) Li-Fi is a VLC technology developed by a team including Dr. Gordon Povey, Prof. Harald Haas, and Dr. Mostafa Afgani at the University of Edinburgh that uses LED lights to transmit data through illumination by varying the intensity faster than the human eye can detect.
2) It was first coined by Prof. Harald Haas in 2011 and allows wireless communication without radio waves, which can be dangerous in some environments like oil platforms.
3) Li-Fi works by using a microchip in an LED bulb to encode data by switching the LED on and off very fast to transmit 1s and 0s, which is received by a light sensitive detector and converted
Li-Fi is a new paradigm for optical wireless technology to provide unprecendented connectivity within a localized data-centric environment. The increasing demand for higher bandwidths, faster and more secure data transmission as well as environmental and undoubtedly human friendly technology heralds the start of a major shift in wireless technology, a shift from RF to optical technologies.
The principle is simple: turn a light on and off so rapidly that the human eye can't see the flicker, but a photodetector can nonetheless pick up the stream of 1s and 0s the blinking bulb is transmitting. Compress the data, and you up the throughput even more. Old-style filament bulbs and fluorescent tubes aren't up to the task, but new, LED-based lighting is.
The principle is simple: turn a light on and off so rapidly that the human eye can't see the flicker, but a photodetector can nonetheless pick up the stream of 1s and 0s the blinking bulb is transmitting. Compress the data, and you up the throughput even more. Old-style filament bulbs and fluorescent tubes aren't up to the task, but new, LED-based lighting is.
LiFi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. LiFi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices.
Report on LIFI Technology
Content:-
LIGHT FIDELITY
NEED FOR LI-FI
OVERCOMING WIFI ISSUES
VISIBLE LIGHT COMMUNICATION
LIFE OF LIFI
HOW IT WORKS?
IMPLEMENTATION
LI-FI NETWORKS
APPLICATIONS
ADVANTAGES
LIMITATIONS
CONCLUSION
LIGHT FIDELITY
Light is used instead of radio-waves to transmit information.
Transceiver fitted LED lamps acts like Wi-Fi modems.
LED lamps can light a room as well as transmit-receive information.
Provides illumination as well as data communication.
Light based WI-FI.
You can get the basic theme of an emerging communication technology named "LiFi" which will overcome the drawbacks of WiFi by a good margin!
(For watching the GIF's use Slideshow)
Light Fidelity is an emerging trend of Internet distributions. With speeds such as 100GBPS, it will be no less than a boon for the regular internet users. Lifi is a substitute of wifi where the internet is distributed to customers via lights, even if they are visibly off to the naked eye.
Lifi Technology presentation best view in powerpoint 2013,16
By Zulafqar Ahmed
Comments below for more slides.
if you want some more and good slides comments below for particular slides
Li-Fi is a new paradigm for optical wireless technology to provide unprecendented connectivity within a localized data-centric environment. The increasing demand for higher bandwidths, faster and more secure data transmission as well as environmental and undoubtedly human friendly technology heralds the start of a major shift in wireless technology, a shift from RF to optical technologies.
The principle is simple: turn a light on and off so rapidly that the human eye can't see the flicker, but a photodetector can nonetheless pick up the stream of 1s and 0s the blinking bulb is transmitting. Compress the data, and you up the throughput even more. Old-style filament bulbs and fluorescent tubes aren't up to the task, but new, LED-based lighting is.
The principle is simple: turn a light on and off so rapidly that the human eye can't see the flicker, but a photodetector can nonetheless pick up the stream of 1s and 0s the blinking bulb is transmitting. Compress the data, and you up the throughput even more. Old-style filament bulbs and fluorescent tubes aren't up to the task, but new, LED-based lighting is.
LiFi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. LiFi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices.
Report on LIFI Technology
Content:-
LIGHT FIDELITY
NEED FOR LI-FI
OVERCOMING WIFI ISSUES
VISIBLE LIGHT COMMUNICATION
LIFE OF LIFI
HOW IT WORKS?
IMPLEMENTATION
LI-FI NETWORKS
APPLICATIONS
ADVANTAGES
LIMITATIONS
CONCLUSION
LIGHT FIDELITY
Light is used instead of radio-waves to transmit information.
Transceiver fitted LED lamps acts like Wi-Fi modems.
LED lamps can light a room as well as transmit-receive information.
Provides illumination as well as data communication.
Light based WI-FI.
You can get the basic theme of an emerging communication technology named "LiFi" which will overcome the drawbacks of WiFi by a good margin!
(For watching the GIF's use Slideshow)
Light Fidelity is an emerging trend of Internet distributions. With speeds such as 100GBPS, it will be no less than a boon for the regular internet users. Lifi is a substitute of wifi where the internet is distributed to customers via lights, even if they are visibly off to the naked eye.
Lifi Technology presentation best view in powerpoint 2013,16
By Zulafqar Ahmed
Comments below for more slides.
if you want some more and good slides comments below for particular slides
Light–Fidelity (Li-Fi) is a technology that uses the Light Emitting Diodes (LEDs) to transmit wireless data instead of radio waves.
This is going to be the future of wireless data transmission.
Whether you’re 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. Li-Fi is a VLC, visible light communication, technology
developed by a team of scientists
This is a new tebhnology going to introduce in our networking world as a advance version of wireless communication technology.It will very effective in comparison to Wi-Fi technology.
This was the article which was very well demonstrated in Tedxtalk(https://www.youtube.com/watch?v=iHWIZsIBj3Q). Making use of Light Radiations in place of Radiowaves for regulation our internet.
li-fi: the future of wireless communicationIJMERJOURNAL
ABSTRACT: Nowadays people and their electronic devices access wireless internet. But, clogged airwaves are going to make it increasingly difficult to latch onto a reliable signal. So, Radio waves are just one part of the spectrum that can carry our data. We can use “Data through Illumination”. In this process, the data is sent through an LED source that varies in intensity faster than the human eye could follow. The future can be envisioned where the data for laptops, smart phones and all other smart applications is transmitted through the light in our living room. And security would be a snap—if you can’t see the light, you can’t access the data.
Hey Guys, recently completed the ppt on lifi !!
Hope so that it will be benificial for you and will surely provide u enough knowledge on LiFi technology.
Don't forget to give a thumbZupp' if you liked it :)
Comment if any Queries.
Thanks for watching.
Regards,
DEEPENDRA GOSWAMI
https://www.linkedin.com/in/deependra-goswami-321a92134
2. 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
-German physicist, Prof. Harald Haas
INTRODUCTION OF LI – FI
Li-fi is a VLC (Visible Light
Communication) technology
developed by a team of scientist
including Dr Gordon Povey, Prof.
Harald Hass and Dr Mostafa Afgani
at the university of Edinburg
Prof. Harald Hass
3. INTRODUCTION OF LI – FI
Light–Fidelity (Li-Fi) technology came into existence in 2011.
The term was first used by Harald Haas in his TED Global talk
on Visible Light Communication.
In October 2011 a number of companies and industry groups
formed the Li-Fi consortium, to promote high-speed optical
wireless systems.
Researchers at the Heinrich Hertz Institute in Berlin, Germany,
have reached data rates of over 500 megabytes per second
using a standard white-light LED.
It allows wireless communication without the use of radio
waves, which can be dangerous in places like oil platforms,
underwater and on planes
Li-Fi can be thought of as a light-based Wi-Fi.
6. HOW IT WORKS
• Heart of Li-Fi technology is high brightness LED’s. The
LED bulb will hold a micro-chip that will do the job of
processing the data.
• 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.
7. HOW IT WORKS
• We have to just vary the rate at which the LED’s flicker
depending upon the data we want to encode.
• A light sensitive device (photo detector) receives the signal
and converts it back into original data.
8.
9. WHY ONLY VLC
Radio
Waves
Infrared
Rays
Visible
Rays
Ultraviolet
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.
HENCE WE LEFT WITH THE ONLY THE VISIBLE – LIGHT SPECTRUM.
11. IN TERMS OF CAPACITY
CAPACITY:
With the increasing number of
mobile connections the availability
of the spectrum is getting
congested.
Radio waves form only a small
fraction of the entire EM spectrum
thus making the problem even
worse.
CAPACITY:
Light is a readily available form of
energy and it covers the major
portion of the EM spectrum.
Visible light spectrum is 10000 times
more compared to radio wave
spectrum.
12. IN TERMS OF EFFICIENCY
EFFICIENCY:
For every unit of energy consumed
the data transmitted is relatively
less.
The data speeds in the current
system can only reach up to a few
hundreds of megabits per second.
EFFICIENCY:
The data transmission for a unit
energy consumption is high in the
case of light waves.
The data transmission can reach up
to gigabits per second thus
providing very rich data streaming.
13. IN TERMS OF AVAILABLITY
AVAILABILTY:
The availability of the radio waves is
yet another major issue now a days.
These waves are not much available
during the flight travel.
AVAILABILITY:
Light is readily available in every
part of the world.
This makes it easy for people in
airplanes to work on the internet.
14. IN TERMS OF SECURITY
SECURITY:
These radio waves can easily
penetrate through the walls, thus
letting anonymous users to use the
network.
This can pose threat if the people
with bad intentions start using it.
SECURITY:
Unlike radio waves light waves
cannot penetrate through opaque
objects thus providing plenty of
network privacy.
No other person can share a
network unless the owner has
permitted them to use it.
16. FUTURE APPLICATIONS
• Li-Fi can be used in sensitive areas such as aircraft for data
transmission without causing interference.
• It can be used in places where it is difficult to lay optical fibers
like operation theaters .
• In traffic scenario, Li-Fi can be used to communicate with the LED
lights of cars and might alert drivers when other vehicles are too
close so accident numbers can be decreased.
• It will improve conditions for those working in underwater oil rigs
where radio waves can’t propagate.
• Thousands and millions of street lamps can be transferred to Li-Fi
lamps to transfer data.
• It can be used in petroleum and chemical plants where other
transmission or frequencies could be hazardous.
17. CHALLENGES FOR LI-FI
• Presence of Light is essential.
• Li-Fi requires line of sight.
• It is easily blocked by somebody simply walking in front of
LED source.
• The grand vision: “LED lights with added microchips will let
us transmit thousands of data streams in parallel, enabling
us to access the Internet on smartphones wherever there is
a light source”.
18. CONCLUSION
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 hotspot to transmit wireless
data and we will proceed toward the cleaner, greener, safer
and brighter future.
19. REFERENCES
• Issue of Wired world magazine, february 2012(Article
Meet Li-Fi, the LED-based alternative to household Wi-
Fi.)
• http://www.ted.com/talks/harald_haas_wireless
_data_from_every_light_bulb.html
• http://www.lificonsortium.org/
• Journal: International Journal of Innovative Research in
Computer and Communication Engineering ISSN/EISSN:
23209798 23209801
• Year:2013 Volume: 1 Issue: 2
• http://en.wikipedia.org/wiki/Li-Fi