introduction to li-fi(light fidelity technology)

1. Presentation on
LI-FI
TECHNOLOGY
BY-Jasraj 14105076
Karan 14105073
Nikunj 14105097
Avi 14105048
1st year ECE

2. Introduction to lifi technology
# Li-Fi is transmission of data through illumination.
# LED Bulb varies in intensity faster than the human eye can
follow.
# LED lights can be switched on and off at high speeds.
# This property is the basics for Li-Fi.
# LED when on gives binary 1 and off gives binary 0

3. FOUNDER
Professor Harald Haas
from the University of
Edinburgh
coined the term Li-Fi in in
TED global talk in 2011.
Harald Haas continues
to wow the world with the
potential to use light for
communication
Prof. Harald Haas
University of Edinburgh.

4. How lifi works

6. Light for Wireless communication
Light has been around for millions of years It has created us, has created life and
has created all stuffs of life.Light is part of electromagnetic spectrum.There are
40 billion light box already installed.Flickering lights are annoying but thy may
have an upside. Li-Fi uses rapid pulses of light to transmit information
wirelessly.
It is inherently safe to use and would be great if we can use it for our wireless
communication.

7. WI-FI vs LI-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.

8. Present Scenario
#We have 1.4 million cellular base stations deployed
#We also have 5 billion of mobile phones
#Mobile phones transmit 600tb of data every Month
#Wireless communication has become an utility likE
electricity and water #We use it in our everyday life, private
life, business life
#Currently Wi-Fi uses radio waves

9. Disadvantages of other
spectrums

10. Advantages
 Availability
 Efficiency
 High security
 Easy to use
 Fast data transfer
 Harmless
 Low-cost
 Capacity

11. APPLICATIONS OF LI-FI

12. Limitations
#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.
#Li-Fi requires line of sight.
#High installation cost of the VLC systems.
#A major challenge facing Li-Fi is how the receiving device will transmit back to
transmitter.

13. 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.

14. ”The future is here”