Li-Fi is a visible light communication system that uses LED light bulbs to transmit data wirelessly. It can transmit data at speeds up to 224 gigabits per second. While faster than Wi-Fi, Li-Fi has a shorter range and requires light bulbs to be on, as the signals cannot pass through walls. Li-Fi may be better suited than Wi-Fi for applications requiring high speeds and better security due to its limited range. Overall, the document compares the capabilities of the emerging Li-Fi technology to traditional Wi-Fi networks.
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.
the future of wifi.Light Fidelity or Li-Fi is a Visible Light Communications (VLC) system running wireless communications travelling at very high speeds. Li-Fi uses common household LED (light emitting diodes) lightbulbs to enable data transfer, boasting speeds of up to 224 gigabits per second
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.
Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used, there can technically be any number of access points.
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.
This about the upcoming technology and a replacement for WiFi.
It is cheaper and very faster than the present wireless communication technology.
It was invented by Harald Hazz in 2012 at University of Edinburg. And demonstrated in a demonstration conducted by TED.
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.
the future of wifi.Light Fidelity or Li-Fi is a Visible Light Communications (VLC) system running wireless communications travelling at very high speeds. Li-Fi uses common household LED (light emitting diodes) lightbulbs to enable data transfer, boasting speeds of up to 224 gigabits per second
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.
Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used, there can technically be any number of access points.
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.
This about the upcoming technology and a replacement for WiFi.
It is cheaper and very faster than the present wireless communication technology.
It was invented by Harald Hazz in 2012 at University of Edinburg. And demonstrated in a demonstration conducted by TED.
In simple terms, Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used, there can technically be any number of access points.
This technology uses a part of the electromagnetic spectrum that is still not greatly utilized- The Visible Spectrum. Light is in fact very much part of our lives for millions and millions of years and does not have any major ill effect. Moreover there is 10,000 times more space available in this spectrum and just counting on the bulbs in use, it also multiplies to 10,000 times more availability as an infrastructure, globally.
Li-Fi Technology,LI-FI ENERGY TRANSFORMATIONPrasant Kumar
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.
LiFi data is transmitted by the LED bulbs and received by photoreceptors.
Professor Harald Haas, from the University of Edinburgh in the UK, is widely recognised as the original founder of Li-Fi.
He coined the term Li-Fi and is Chair of Mobile Communications at the University of Edinburgh and co- founder of pureLiFi.
Haas promoted this technology in his 2011 TED Global talk and helped start a company to market it.
In October 2011, companies and industry groups formed the Li-Fi Consortium, to promote high-speed optical wireless systems.
The first Li-Fi smartphone prototype was presented at the Consumer Electronics Show in Las Vegas from January 7–10 in 2014.
Li-Fi technology is based on LEDs for the transfer of data.
The transfer of the data can be with the help of all kinds of light, no matter the part of the spectrum that they belong.
That is, the light can belong to the invisible, ultraviolet or the visible part of the spectrum.
Light Fidelity (Li-Fi) is a bidirectional, high-speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas[1] and is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or cellular networks), or even a replacement in contexts of data broadcasting.
A presention on LIFI technology..
Use MS Office 13 to view the original fonts and pics used within(as they are not supported in the previous versions..)
2. What is Li-Fi ?
• A Visible Light Communications
system
• Wireless and bidirectional
communications, transmit data
at very high speeds
• Uses common household LED
(light emitting diodes) light
bulbs to enable data transfer
Boasting speeds of up to 224
gigabits per second
• More-secure communications
and reduced device
interference
3. History
of Li-Fi
• Introduced by University of Edinburgh
Professor Herald Haas during a TED Talk in
2011
• Herald Haas set up company pure Li-Fi with
the aim to be the world leader in Visible
Light Communications technology’ in 2012
Prof Herald Haas demonstrating Li-Fi during TED Talk on Aug 2011
4. Why Li-Fi ?
Expensive,
Limited BW
Less Secure
Low power
Applications
• Range not used so far
• Safe to use
• Larger bandwidth
Dangerous for
human body
Used for
Hospitals
Is not used
generally
Visible Light
5. How
Li-fi
works
If the led is on, you transmit a digital 1, if its off you
transmit a 0.
The LEDs are able to switch on and off very quickly,
which provides certain signal for transmitting data.
A controller at the receiving end codes the signals as
per the blinking of LED and convert it into data.
Every light source will works as a hub for data transmission
6. How
Li-fi
works
Data is fed into an LED light bulb which
can be dipped and dimmed, up and
down at extremely high speeds, without
being visible to the human eye
The changes in light intensity from the
LED light source are interpreted and
converted as electrical current by the
receiving photodiode device.
Once the electronic signal is
demodulated, it is converted into a
continuous stream of binary data
comprising of audio, video, web, and
application information to be consumed
by any Internet-enabled device.
1
2
3
7. HOW IT WORKS
An overhead lamp fitted with an LED with signal-processing
technology (below) streams data embedded in its beam at ultra
high speeds to the photo-detector. A receiver dongle then
converts the tiny changes in amplitude into an electrical signal,
which is then converted back into a data stream and transmitted
to a computer or mobile device
8. Li-Fi vs Wi-Fi
• Wi-Fi uses radio waves while Li-Fi runs on visible light.
• While some may think that Li-Fi with its 224 gigabits per second
leaves Wi-Fi in the dust, Li-Fi's exclusive use of visible light could
halt a mass uptake.
• Li-Fi signals cannot pass through walls, so in order to enjoy full
connectivity, capable LED bulbs will need to be placed throughout
the home. Not to mention, Li-Fi requires the lightbulb is on at all
times to provide connectivity, meaning that the lights will need to
be on during the day
9. Li-Fi vs Wi-Fi
• In an announcement yesterday, an extension of standard Wi-Fi is
coming and it's called Wi-Fi HaLow.
• This new project claims to double the range of connectivity while
using less power. Due to this, Wi-Fi HaLow is reportedly perfect for
battery powered devices such as smart watches, smartphones and
lends itself to Internet of Things devices such as sensors and smart
applications.
• But it's not all doom and gloom! Due to its impressive speeds, Li-Fi
could make a huge impact on the internet of things too, with data
transferred at much higher levels with even more devices able to
connect to one another.)
• What's more, due to its shorter range, Li-Fi is more secure than
Wi-Fi and it's reported that embedded light beams reflected off a
10. Li-Fi vs Wi-Fi
Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically.
Wi-Fi uses radio waves while Li-Fi runs on visible light.
While some may think that Li-Fi with its 224 gigabits per second leaves Wi-Fi in the dust, Li-Fi's exclusive
use of visible light could halt a mass uptake.
Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need
to be placed throughout the home. Not to mention, Li-Fi requires the lightbulb is on at all times to
provide connectivity, meaning that the lights will need to be on during the day
11. Li-Fi vs Wi-Fi continued..
• What's more, where there is a lack of light bulbs, there is a lack of Li-Fi internet so Li-Fi does
take a hit when it comes to public Wi-Fi networks.
• In an announcement yesterday, an extension of standard Wi-Fi is coming and it's called Wi-Fi
HaLow.
• This new project claims to double the range of connectivity while using less power. Due to this,
Wi-Fi HaLow is reportedly perfect for battery powered devices such as smart watches,
smartphones and lends itself to Internet of Things devices such as sensors and smart
applications.
• But it's not all doom and gloom! Due to its impressive speeds, Li-Fi could make a huge impact
on the internet of things too, with data transferred at much higher levels with even more
devices able to connect to one another.)
• What's more, due to its shorter range, Li-Fi is more secure than Wi-Fi and it's reported that
embedded light beams reflected off a surface could still achieve 70 megabits per second.
14. The future of Li-Fi
• In November 2014, Li-Fi pioneers pureLiFi joined forces with French
lighting company Lucibel aiming to bring out Li-Fi enables
products, by the end of 2015.
• pureLiFi already have two products on the market: Li-Flame Ceiling
Unit to connect to an LED light fixture and Li-Flame Desktop Unit
which connects to a device via USB, both aiming to provide light
and connectivity in one device.
• Plus, with faster connectivity and data transmission it’s an
interesting space for businesses. The integration of internet of
things devices and Li-Fi will provide a wealth of opportunities for
retailers and other businesses alike. For example, shop owners
could transmit data to multiple customers' phones quickly, securely
and remotely.
15. The future of Li-Fi
• Li-Fi is reportedly being tested in Dubai, by UAE-based
telecommunications provider, du and Zero1. Du claims to have
successfully provided internet, audio and video streaming over a
Li-Fi connection.
• What's more, reports suggest that Apple may build future iPhones
with Li-Fi capabilities. A Twitter user found that within its iOS 9.1
code there were references to Li-Fi written as 'LiFi Capability'
hinting that Apple may integrate Li-fi with iPhones in the future.
16. Li-fi over
Wi-fi
Parameters Li-Fi Wi-Fi
Capacity High band width Constraining
bandwidth
Availability Can expand its range
simply by adding LED
bulbs.
Limited availability
within limited area.
Efficiency Uses visible light
spectrum, visible light
frequencies are immune
to disturbance and
interruption.
Uses radio
frequencies to
operate connection
wirelessly, so chances
of disturbance and
interruption.
Security Insecure Secure
Ease to Use Access to internet
through LED Bulbs.
Fast Data
Transfer
Can transfer data
greater than 1GB/Sec
Can transfer data
around 150MB/Sec
Low Cost Cheaper Expensive
17. Limitation
• Li-Fi technology uses visible light as its means of communication, it
won't work through walls.
• Interference from external light sources like sun light, normal bulbs
and opaque materials in the path of transmission will cause
interruption in the communication.
• High installation cost of the VLC systems
18. conclusion
• the newest technology of Li-Fi has proven to
be a milestone in communication systems
•It uses the visible spectrum of light which is
far better than the RF as it is prone to
interference.
• With the use of LEDs the information can be
transmitted at very high rates with just the
simple turning on and off of the LEDs
•this technology is not only free to use but
also provides a safe and secure access
