Lifi technology

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.

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