The document discusses Li-Fi technology, which uses visible light communication to transmit data wirelessly. It notes that Li-Fi would use LED lamps that can both light a room and transmit information. The document outlines some limitations of radio spectrum communication and advantages of Li-Fi, including larger bandwidth, high speeds of up to 10 GBPS, and helping to overcome limitations of the crowded radio spectrum. However, it also lists some challenges of Li-Fi, such as the need for line-of-sight and inability to transmit through walls.

1. Amit Kumar
CS-B3
1209710902
Mr. Luknesh Sir

2. 


Li-Fi can be thought of as a light-based
Wi-Fi. 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.
It is transmission of data through
illumination ,i.e. sending data through a
LED light bulb that varies in intensity
faster than human eye can follow.

4. 


Radio spectrum
1.4 Million base stations, 5 billion Mobile
stations
600tb data every per month

5. Radio Spectrum is congested but the demand for
wireless data double each year. Everything, it seems want
to use wireless data but the capacity is drying up.

Available within the range of Base stations

Limited availability

Unavailable in aircrafts

Less secure (passes through the walls)

Cost and Expensive

Less bandwidth compared to other spectrums

Harmful to humans health

6. A high brightness white LED, Which
act as a communication source.
LED
Fluorescent
Lamp
Transmitting
element

7. 

Receiving elements are “AVALANCHE
PHOTO DIODE” and image sensor.
Avalanche photo diode is responsible for
converting the light signal into electrical
signal and further the procedure is carried
out by image sensor.

8. WHY ONLY VLC?
Radio
Waves

Infrared
Rays
Visible
Rays
Ultraviolet
Rays
X- 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 be
used with low power.
Gama
Rays

9. DIFFERENCE BETWEEN
TECHNOLOGIES

16. 




You cannot dim the lights.
VLC is unidirectional (downlink or
broadcast only).
There will be interference from
sunlight.
You must have line-of-sight.
VLC is a complex technology.

17. ADVANTAGES ….

Larger bandwidth ( 10,000 times the radio
bandwidth )

High speed data rate

High efficiency

Highly secure

Works even under water in sea

Safe for health

More availability

Low cost solution

18.  These signals cannot
penetrate walls.
 If you want to move from one
room to another, you will need
to have a wired bulb present in
that room.!!

20.  Overcomes the limitations of radio
spectrum.
 High speed of 10 GBPS can be
achieved.
 Li-fi can solve the foresential
problems of wireless communications
these days.