The document discusses Light Fidelity (LiFi), a technology that transmits data through LED light bulbs, offering a wireless communication system that operates on the visible light spectrum. It outlines the advantages, disadvantages, and potential applications of LiFi compared to traditional WiFi, including its higher data transfer speeds and more secure communications. Future utilization of LiFi technology is suggested, with possibilities for implementation in various environments, including underwater communication and public hotspots.

1. Wireless Communication
Light Fidelity (LIFI)
Presented by
Adityan Iyer (15EE7054)
Shushant Tawar (17EE5510)
Shubham Thakur (17EE5506)
Rameshwar Thorbole (17EE5513)
Department of Electronics Engineering
Ramrao Adik Institute of Technology,
Nerul, Navi Mumbai

3. Content
Content3
Introduction
History
What Is LiFi
How LiFi Works
Why Only Visible Light Spectrum
Comparison Of LiFi And WiFi
 Application Areas
Advantages Of LiFi
Disadvantages Of LiFi
Future Implementation
References

4. Introduction
Introduction4
LI FI- LIGHT FIDELITY.
 Li-Fi is the transmission of data through
illumination, by taking the fiber out of fiber
optics by sending data through a LED light
bulb.

5. This technology was invented
by German Physicist “HARALD
HASS”, from the university of
Edinburgh, U.K.
He demonstrated it in the
year 2012.
He explained Very simple, if
the LED is on, you transmit
digital 1;if it’s off you transmit
a 0.
HISTORY
HISTORY5

6. WHAT IS LIFI?
WHAT IS LIFI6

7.  Li-Fi is the transmission of data
through illumination by taking the
fiber out of fiber optics by sending
data through a LED light bulb.
 The intensity of LED bulb varies Faster
than human eye can follow
 It is the fast and cheap wireless
communication system which is
optical version of the Wi-Fi.
WHAT IS LIFI?
What is lifi7

8. If the led is on, transmit a Logic 1, if its off you transmit Logic
0.
 The LEDs can be switched on and off very quickly Hence all
that us required is some LEDS and a controller that code data
into those LEDs.
We have to just vary the rate at which the LED’s flicker
depending upon the data we want to encode.
HOW LIFI WORKS
How lifi works8

9. HOW LI-FI WORKS
HOW LIFI WORKS9

10. Thus every light source will works as a hub for data
transmission.
On one end, all the data on the internet will be streamed to
a lamp driver when the led is turned on the microchip
converts the digital data in form of light.
A light sensitive device (photo detector) receives the signal
and converts it back into original data. This method of using
rapid pulses of light to transmit information wirelessly is
technically referred as Visible Light Communication.
HOW LIFI WORKS...
10

11. Gamma 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.
Radio waves are limited bandwidth, expensive and less secure.
WHY ONLY VISIBLE LIGHT SPECTRUM
WHY ONLY VISIBLE LIGHT SPECTRUM11
Radio
Waves
Gamma
Waves
Infrared
Rays
Visible
Waves
Ultra
voilet
Waves
X ray
Waves

12. PARAMETER LIFI WIFI
Transmission of Data Li-Fi transmite data using
light with the help of LED
bulb
WI-FI transmite data
using radio waves with
the help of WIFI routers
Privacy In LIFI, light is blocked
by the walls and hence
will provide more secure
data transfer
In Wi-Fi, RF can not be
blocked by the walls and
hence need some
techniques to secure data
transfer
Data Transfer Speed About 1 Gbps It offers 150 Mbps
Coverage Distance About 10 meter About 32 meter
Operating Frequency Ten times frequency
spectrum
2.4GHz
COMPARISON: LiFi VS. WiFi
12

13. 1. RF Restricted Enviroment:
APPLICATIONS AREAS…
13
 Visible Light is more safe than
RF, hence it can be used in places
where RF can't be used such as
petrochemical plants .

14. The whole airways
communication are
performed on the basis
of radio waves.
To overcome this
drawback on radio ways,
li-fi is introduced.
APPLICATIONS AREAS…
14
2. Airlines:

15.  Li-Fi can even work
underwater
were Wi-Fi fails
completely, thereby its
very much useful for
military/navigation
operations.
APPLICATIONS AREAS…
15
3. Underwater communication:

16.  There are million of
street lamps deployed
around the world.
 Street lamps can be
transferred to LIFI lamps
to transfer data.
 Each of these street
lamps could be a free
access point.
APPLICATIONS AREAS…
16
4. Public Internet Hotspot:

17. Li-Fi never gives side
effect on any living thing.
It does not require any
band width spectrum.
Any lightings device is
performed as a hotspot.
Can be used underwater
without radio interference
because salt conducts
electricity.
ADVANTAGES OF LIFI
17

18. Presence of light is essential.
There should be line of sight.
 Works better with fluorescent light
and LEDs but very low efficiency with
bulbs.
 Interferences from external light
sources like sun light, normal bulbs,
and opaque materials in the path of
transmission will cause interruption
in the communication.
High installation cost of the VLC
systems.
DISADVANTAGES OF LIFI
18

19. If this technology can be put into practical use , every bulb can be
used something like a Wi-Fi hotspots to transmit wireless data.
FUTURE IMPLEMENTATION
19

20. http://lificonsortium.org
http://gimt.edu.in
Light fidelity (Li-Fi): towards all-optical networking
Dobroslav Tsonev, Stefan Videv, Harald Haas.
References
References20

21. Thank You