Li-Fi technology, introduced by physicist Harald Haas, enables data transmission through LED light variations, providing a solution to the congested radio spectrum as demand for wireless data increases. It offers advantages such as high security, fast data transfer, and low cost, while facing challenges like light obstruction and interference. The technology presents numerous applications, including usage in hospitals, aircraft, and as free access points in street lamps.

1. LI-FI TECHNOLOGY IN WIRELESS
COMMUNICATION
Vidya Vikas Institute of Engineering and
Technology
A Seminar On:
Submitted by:
Ananda Murthy D
Under the guidance of:
Purushotham K P
Asst Prof
Dept of E&C
VVIET

2. CONTENTS
 Introduction
 Drawbacks Of Before Technologies
 Different Between The Technologies
 Working process Of Li-Fi
 Applications
 Merits/De-Merits
 Conclusion

3. INTRODUCTION
 One germen phycist. Harald
Haas has come up with a
solution he calls
 “data through illumination” D-
Light taking the fiber out of
fibber optic by sending data
through an LED light bulb that
varies in intensity faster than
the human eye can follow.

5. HISTORY OF NETWORKS
In the olden days.
Wired networking.
Satellites Communications.
Wireless networking.

6. PRESENT TECHNOLOGY
1.4 Million 5 Billion

7. PRESENT TECHNOLOGY
 Radio Spectrum is congested but the demand for wireless
data double each year .Every thing, it seems want to use
wireless data but the capacity is drying up.
 So what can carry this excess demand in the future .
 1.4 Million base stations, 5 billion Mobile stations
 600tb data every month

8. Availability
Security
Efficiency
Capacity
ISSUES REGARDING RADIO SPECTRUM

10. WHO CAN REPLACES
THE RADIO WAVES FOR
WIRELESS
COMMUNICATION ?

12. LI-FI TECHNOLOGY
oLi-Fi means “Light Fidelity”.
It is possible to encode data in
the light by varying the rate at
which the LEDs flicker ON and
OFF to give different strings of
1’s and 0’s.

13. ARCHITECTURE OF LI-FI

14. LI-FI ENVIRONMENT

15. WORKING PROCESS
Li-Fi offers an integrated light source that is straight forward to
integrate into a projector. In this example LIFI consists of 5
primary sub-assemblies:
 Printed circuit board (PCB)
 RF power amplifier (PA)
 Bulb
 Optics
 Enclosure

16. HOW LI-FI WORKS ?
 operational procedure is very simple
 if the LED is ON, you transmit a digital 1’s
if its OFF you transmit a 0’s.
The LEDs can be switched ON and OFF very quickly,
which gives nice opportunities for transmitting data.

17. DATA TRANSMISSIONS

18. DATA TRANSMISSIONS USING LI-FI

19. For giga-speed technologies, the Li-Fi Consortium defined
GigaShower, GigaSpot and GigaMIMO models

20. DIFFERENT BETWEEN THE TECHNOLOGIES

21. APPLICATIONS
 ON OCEAN BEDS
 RF restricted Environments
 Hospitals(In few medical instruments
 Street lamps(as free access points)
 In Aircraft cabins

22. IN RF RESTRICTED ENVIRONMENTS

23. HOSPITALS(IN FEW MEDICAL INSTRUMENTS)

24. STREET LAMPS(AS FREE ACCESS POINTS)

25. IN AIRCRAFT CABINS

26. MERITS
 High Security
 Easy To Use
 Fast Data Transfer
 Reliable
 Harmless ness
 Low Cost

27. DE-MERITS
 light can't pass through objects
 Connectivity while moving
 Interferences from external light sources like sun light,
normal bulbs, and opaque materials in the path of
transmission will cause interruption in the
communication.

28. 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 hotspot to transmit wireless data and we will proceed
toward the cleaner, greener, safer and brighter future.

29. REFRENCES
[1]http://www.electronicsforu.com/electronicsfo
ru/circuitarchives/view_article.asp?sno=778&ti
tle%20=%20LiFi%3A+A+New+Paradigm+in+
Wireless+Communication&b_type=new&id=1
2042
[2]. http://en.wikipedia.org/wiki/Li-Fi
[3]. International Journal of advances in
computing & communications, vol 1, 2013,page
no-12 www.ijacc.org