Li-Fi is a new technology that uses light from LED bulbs to transmit data wirelessly. It provides higher speeds and more available bandwidth than traditional Wi-Fi networks. The presentation covers the history of Li-Fi development, how it works by varying the intensity of LED light faster than the human eye can detect, its advantages over Wi-Fi like higher speeds and security, potential applications in traffic lights, airplanes and underwater, and challenges to commercialization like the need for line of sight and modifications to existing devices. Overall, Li-Fi shows promise as a supplement to Wi-Fi but still faces technical hurdles to widespread adoption.
This is the latest technolgy which encourages viewers. Also this technolgy is vast because researchers are still researching about this technolgy so that this technolgy can be used practically all over the world.
This is the latest technolgy which encourages viewers. Also this technolgy is vast because researchers are still researching about this technolgy so that this technolgy can be used practically all over the world.
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..)
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication...Sirod Deo
The demand for wireless data is increasing at an exponential rate hence to cater the demand, various technology options are to be looked for and need to be implemented. An emerging technology using Visible Light Communication (VLC) for high speed wireless communications is Light Fidelity dubbed as Li-Fi. To provide high speed communication light is modulated without interfering the main purpose of lamp that is of illumination. LEDs are considered as a key component to be used in transmission because of its low cost and Omni-presence. 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.
With the vast growing gadgets, their usage and their developments led to the advancement in the Wi-Fi which provides a technology so called Li-Fi.Li-Fi is a technology that makes use of LED light which helps in the transmission of data much more faster and flexible than data that can be transmitted through Wi-Fi.Light reaches nearly everywhere so communication can also go along with light freely. Light Fidelity is a branch of optical wireless communication which is an emerging technology. By using visible light as transmission medium, Li-Fi provides wireless indoor communication. The bit rate achieved by Li-Fi cannot be achieved by Wi-Fi.. Dr herald Haas ,the professor of mobile communications at the university of Edinburgh school of engineering ,first time publically displayed the proof of Light Fidelity(Li-Fi) ,a method of Visible Light communication(VLC). Li-Fi is the transfer of data through light by taking fiber out of fiber optics and sending data through LED light.
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..)
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication...Sirod Deo
The demand for wireless data is increasing at an exponential rate hence to cater the demand, various technology options are to be looked for and need to be implemented. An emerging technology using Visible Light Communication (VLC) for high speed wireless communications is Light Fidelity dubbed as Li-Fi. To provide high speed communication light is modulated without interfering the main purpose of lamp that is of illumination. LEDs are considered as a key component to be used in transmission because of its low cost and Omni-presence. 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.
With the vast growing gadgets, their usage and their developments led to the advancement in the Wi-Fi which provides a technology so called Li-Fi.Li-Fi is a technology that makes use of LED light which helps in the transmission of data much more faster and flexible than data that can be transmitted through Wi-Fi.Light reaches nearly everywhere so communication can also go along with light freely. Light Fidelity is a branch of optical wireless communication which is an emerging technology. By using visible light as transmission medium, Li-Fi provides wireless indoor communication. The bit rate achieved by Li-Fi cannot be achieved by Wi-Fi.. Dr herald Haas ,the professor of mobile communications at the university of Edinburgh school of engineering ,first time publically displayed the proof of Light Fidelity(Li-Fi) ,a method of Visible Light communication(VLC). Li-Fi is the transfer of data through light by taking fiber out of fiber optics and sending data through LED light.
Lifi Technology presentation best view in powerpoint 2013,16
By Zulafqar Ahmed
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What is Li-Fi ?
Light-Fidelity
LI-FI is transmission of data through illumination,
sending data through a LED light bulb that varies
intensity faster than human eye can follow.
How data transmission can be advanced to reach the maximum transmission rate, using the recent development technique based on visible light communication.
Li-Fi, or light fidelity, is 5G visible light communication systems using light from light-emitting diodes (LEDs) as a medium to deliver networked, mobile, high-speed communication in a similar manner as Wi-Fi and Optical fiber.
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GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
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3. Introduction
What is Li - Fi ?
Light-Fidelity
LI-FI is transmission of data through illumination, sending
data through a LED light bulb that varies intensity faster
than human eye can follow.
It means delivering data with the help of LED LIGHT.
4. Existing wireless technology - Why
do we need an alternate
technology?
CAPACITY
EFFICIENCY
AVAILABILITY
SECURITY
5. Present Scenario
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.
1.4 Million Base Stations 5 Billion
6. Radio Spectrum Issues
Capacity
Radiowaves
Less Bandwidth compared to LiFi.
Insufficient spectrum for increasing data
5% Efficiency
Efficiency
Availability
Security
Available within the range of Base stations
Unavailable in aircrafts
Less secure(passes through the walls)
7. History of Li-Fi
The technology truly began during the 1990's in 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 .
Prof. Harald Haas
University of Edinburgh.
8. Why 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 bse used with
low power.
HENCE WE LEFT WITH THE ONLY THE VISIBLE - LIGHT
SPECTRUM.
Why only VLC ?
9. Working Process
.
Operational procedure is very simple.
If LED is ON, digital data ‘1’ is transmitted & if
LED is OFF, digital data ‘0’ is transmitted.
• LEDs varies in intensity so fast that a human eye
cannot detect it
A controller connected at the back side of these
LEDs is used to code data.
11. How Li-Fi Works ?
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 .
12. Comparision between Li-Fi and Wi-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.
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.
WI-FI is great for general wireless coverage within buildings,
and li-fi is ideal for high density wireless data coverage in
confined area and for relieving radio interference issues .
So the two technologies can be considered complimentary.
14. Application Areas
Li Fi technology is still in its infancy .However some areas
where it seems perfectly applicable are:-
1 . 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.
15. Potential Application of Li-Fi
2. Intrinsically Safe Environment :
Visible Light is more safe than RF, hence it can be used in
places where RF can't be used such as petrochemical plants .
17. Potential Application of Li-Fi
3. Airlines :
Whenever we travel through airways we face the problem
in communication media ,because the whole airways
communication are performed on the basis of radio waves. To
overcome this drawback on radioways , li-fi is introduced.
18. Potential Application of Li-Fi
4. On Ocean Beds :
Li-Fi can even wok underwater were Wi-Fi fails
completely, thereby throwing open endless opportunities for
military/navigation operations.
19. Application
• There are millions of street lamps deployed around the world.
Street Lamps (As free Access Points) :
• Each of these street lamps could be a free access point.
20. Limitations or Challanges
Light can't pass through objects .
Interferences 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 .
Major challenge is, entire equipment which is present
now, is to be modified or an additional equipment for every
device is required, to use it.
Li-Fi requires line of sight.
21. 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 hotspots to transmit wireless
data.