LiFi is a visible light communication technology that uses LED light bulbs to transmit data wirelessly. It was developed at the University of Edinburgh as an alternative to WiFi that uses radio waves. LiFi has several advantages over WiFi, including higher speed, more secure connections, energy efficiency, and an unlimited spectrum. Potential applications of LiFi include use in traffic lights, classrooms, industrial settings, hospitals, underwater, and with street lamps to provide free public access to connectivity. However, LiFi also faces limitations such as inability to transmit through solid objects and interference from other light sources. Overall, LiFi shows promise for the future if the technology can be implemented practically by using everyday light bulbs as wireless hotspots.

1. GREEN UNIVERSITY OF
BANGLADESH
Department: EEE (Eve)
Prepared For:
Md. Khairul Bashar
Lecturer, GUB
Prepared By:
Md. Sahed Dewan
ID# 143010021
Course Title: Communication Theory

2. LiFi

3. What Is LiFi
 Light Fidelity
 Light based Wi-Fi
 Light 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

4. History of Li-Fi
LiFi is a Visible Light Communication (VLC)
technology developed at the University of
Edinburgh by a group of scientists
including…….
Prof. Harald Haas

5. How LiFi Works ?

6. •
Parameters Wi-Fi Li-Fi
Standard IEEE 802.11 IEEE 802.15
Range 100 meters Based on LED light
Data transfer rate 800 kbps – 1.3 gbps 10 gbps
Power consumption Medium Low
Cost Medium High
Security Medium High
Operating Frequency 2.4 GH Hundred s of Tera Hz

7. Applications
Li-Fi technology is still in its infancy.
However some areas where it seems
perfectly applicable are-

8. Applications
Traffic lights can
communicate to the car
and with each other.
Cars have LED based
headlights and
backlights. Cars can
communicate with each
other and prevent
accidents by exchanging
information.
 Traffic Lights:

9. Application
 Lecture/ Seminar Halls:
 Downloading notes
from blogs of teachers.
 Interactive
classroom with
interconnected
devices.
 Sharing views &
queries with the entire
class.

10. Application
 Industries:
 Used in RF restricted environments like-
Chemical Industries, Nuclear Power Plants,
Petrol Pumps.

11. Application
 Hospitals(In Few Medical Equipments) :

12. Application
 Under Water:
Li-Fi can even wok underwater where Wi-Fi
fails completely.

13. Application
Street Lamps:
Street lams can be use as a free access point.

14. Limitations
 Visible light cannot penetrate through solid
objects.
 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.

15. Conclusion
Thus, if LiFi 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
communication. LiFi will make
us to proceed towards the
Cleaner, Greener, Safer and Brighter future.

16. Thank You