LI-FI technology ,this latest Technology LI-FI describes transmission of “data through illumination” taking the fiber out of fiber optic by sending data through an LED light bulb that varies in intensity faster than the human eye can follow.

1. vasusinfotech@gmail.com
(+919036595029)
Submitted by
M. Sreenivas (CSE10090)
Submitted to
G RADHAKRISHNAN
Assistant Professor
N. RAKESH
Assistant Professor

2. Introduction to Li-Fi
Wireless communication
through Light illumination

4. History of Li-Fi
 The technology truly
began during the
1990's in countries like
Germany, Korea, and
Japan where they
discovered LED's
could be retrofitted to
send
information. Harald
Haas continues to wow
the world with the
potential to use light for
communication
Harald Haas

5. Present Wireless Communication
 Radio spectrum
 1.4 Million base stations, 5 billion Mobile stations
 600tb data every month

6. Wireless Communication, a
utility
 Personal life
 Business life
 Hospitals
 Research and development
 Security

7. Issues regarding
Radiospectrum

8. Capacity
 Radiowaves
 Cost and Expensive
 Less Bandwidth compared to other spectrums
 Insufficient spectrum for increasing data
Efficiency
 Millions of basestations consume huge
amount of energy for
1.Transmitting the radio waves
2.To cool the base station cabins
 5% Efficiency

9. Availability
 Available within the range of Base stations
 Limited availabity
 Unavailable in aircrafts
Security:
 Less secure(passes through the walls)

11. WHAT IS Li – Fi ?
 Li-Fi is transmission of data through
illumination, sending data through a LED
light bulb that varies in intensity faster
than human eye can follow

12. How Li-Fi?
 Normal light power is replaced by LED light power
 The LED bulb will hold a micro-chip that will do the job
of processing the data.
 The light intensity can be manipulated to send data by
tiny changes in amplitude
 Properties of LED: (Fundamental property of LI-FI)
1.Intensity can be modulated into very high
speeds and
varying amplitudes
2.LED can be switched on and off with very
high speed

13. Transmitting element
 LED
 Fluorescent Lamp

14. Receiving element
(Detector)
 Avalanche Photo Diode
 Image Sensors

15. Block Diagram
Data
Modulation
(PPM/FSK)
Light
Source
Data
Demodulation
(PPM/FSK)
Photo
Detector

17. LI-FI Data transmission

18. Advantages
• Largers bandwidth (10,000 times the
radio bandwidth)
• High efficiency
• More availability
• Highly secure

19. DISADVANTAGE
 Connectivity while moving
 Multiuser support
 Dimming
 Shadowing

20. APPLICATIONS

21. In RF restricted Environments

22. Hospitals(In few medical
instruments)

23. In vehicles and traffic lights,reducing
accidents and traffic congestion

24. Street lamps(as free access
points)

25. In Aircraft cabins

26. Conclusion
•Overcomes the limitations of radio
spectrum
•High speed of 10 Gbps can be
achieved
•Lifi can solve the foressential
problems
of wireless communications these
days
•Enable ever smaller cells without the
need