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.
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Lifi technology
1. 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
2. • 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.
• NEED FOR LI-FI
Radio spectrum is congested, but the demand for wireless data doubles each
year.
Issues regarding radio spectrum, such as capacity, availability, efficiency,
security are solved using LIFI.
Speed of data transmission can be increased.
• OVERCOMING WIFI ISSUES
CAPACITY:
Spectrum is 10,000 times greater than that of radio frequency.
EFFICIENCY:
Highly efficient since LED consumes less energy.
AVAILABILITY:
Light waves are available everywhere.
SECURITY:
Light can’t penetrate through walls. Hence data cannot be intercepted.
• VISIBLE LIGHT COMMUNICATION
In electromagnetic spectrum, gamma, UV rays are dangerous for human body.
IR rays, due to eye safety regulations, are not used.
3. • LIFE OF LIFI
Introduced by Professor Herald hass, at the University of Edinburgh.
Established in 2011 TED global talk.
The promotion of idea through TED helped to start a company, Pure LiFi
Pure LiFi, formerly pure VLC, is an original equipment manufacturer firm
setup to commercialize Li-Fi products for integration with existing LED
lighting systems.
In October 2011, few companies and industries group formed Li-Fi consortium
to promote the high speed optical wireless systems.
• HOW IT WORKS?
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.
Also called as 5G optical communication.
• IMPLEMENTATION
4. All the data from Internet is streamed into lamp driver.
Data from internet is used to modulate the intensity of LED light source.
Thus by fast and subtle variations of current, optical output can be made to vary
at extremely high speed.
The photo detector picks up the signal.
The receiver dongle then converts the tiny changes in amplitude into a data
stream.
• LI-FI NETWORKS
Li-Fi connector and router are the main components for a network
Room connector:
Optical signals cannot penetrate through walls, in order to provide an
optical WLAN, rooms need to be connected with each other.
Li-Fi room connector is a replicator, which sends the data stream from
one side of the wall to the other side via an optical fiber.
For smaller rooms, connector act as the only Li-Fi hotspot in the room.
5. • APPLICATIONS
LIFI can be used in sensitive areas such as aircrafts for data transmission
without causing interference
Places where it is difficult to lay optical fibers like Operation theaters, Traffic
scenarios.
Underwater applications where radio waves cannot propagate.
Industries like petrochemical plants, nuclear power plant, petrol pumps etc.
• ADVANTAGES
Data rate greater than 10 Gbps; Theoretically allowing HD film to be
downloaded in 30 seconds
Can be used anywhere, even in RF restricted areas; since light waves will not
interfere with radio waves.
Mostly LED light bulbs are used, which consumes less energy.
As light waves cannot penetrate through walls, the data cannot be intercepted;
thus provides secured communication.
Efficient alternative to radio based wireless; since it is quick and reliable.
• LIMITATIONS
Visible light cannot penetrate through solid objects.
6. A major challenge of LiFi is how the receiving device will transmit back to
transmitter.
Interferences from external light sources like sunlight, in the path of
transmission will cause interruption in the communication.
Data transmission can be easily blocked by any object placed in front of LED
source.
• CONCLUSION
Thus, if Li-Fi technology can be put into practical use, every bulb can be used
as an alternative to Wi-Fi hotspots. It provides simple, faster and efficient
wireless data communication. Li-Fi will make us to proceed towards the
cleaner, greener, safer and brighter future.
• REFERENCE
www.wikipedia.com www.purelifi.com
www.lifi-centre.com www.slideshare.net
7. A major challenge of LiFi is how the receiving device will transmit back to
transmitter.
Interferences from external light sources like sunlight, in the path of
transmission will cause interruption in the communication.
Data transmission can be easily blocked by any object placed in front of LED
source.
• CONCLUSION
Thus, if Li-Fi technology can be put into practical use, every bulb can be used
as an alternative to Wi-Fi hotspots. It provides simple, faster and efficient
wireless data communication. Li-Fi will make us to proceed towards the
cleaner, greener, safer and brighter future.
• REFERENCE
www.wikipedia.com www.purelifi.com
www.lifi-centre.com www.slideshare.net