1. LIFI

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

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

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

5. Issues regarding Radiospectrum

6. 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

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

8. Is not used
generally
Used
for
hospit
als
Good to use
But harmful to
human
Expensiv
e, Limited
Bw
Less
Secure
Which is not used so far
Safe to use
Larger bandwith

10. 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

11. Infrared rays in Remote control
•Single data stream
•20000 bits per second
•Not usable for vedio
streaming

12. LI-FI

13. LI-FI
•Light power(LED)
•Multiple data stream
•High speed
•Technologies used in LI-FI: SIM-OFDM and
Spatial modulation

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

16. DISADVANTAGE
Presence of Light is essential

17. APPLICATIONS

18. 1.In RF restricted Environments

19. 2.Hospitals(In few medical
instruments)

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

21. Street lamps(as free access
points)

22. In Aircraft cabins

23. 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