li-fi(light fidelity)

Presentation on LI-FI TECHNOLOGY

BY-Jasraj 14105076 Karan 14105073 Nikunj 14105097 Avi 14105048 1st year ECE

# 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

Introduction to lifi

technology

FOUNDER

Professor Harald Haas from the University of Edinburghcoined 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 HaasUniversity of Edinburgh.

How lifi works

Light for Wireless

communicationLight 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.

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.

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

Disadvantages of other

spectrums

Advantages

Availability Efficiency High security Easy to use Fast data transfer Harmless Low-cost Capacity

APPLICATIONS OF LI-FI

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.

ConclusionThe 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.

”The future is here”