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 9. 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 10. Infrared rays in Remote control
Single data stream 20000 bits per second Not usable for vedio
streaming 11. LI-FI 12. LI-FI Light power(LED) Multiple data stream
High speed Technologies used in LI-FI: SIM-OFDM and Spatial
modulation 13. Advantages Largers bandwidth (10,000 times the radio
bandwidth) High efficiency More availability Highly secure 14.
DISADVANTAGE Presence of Light is essential 15. APPLICATIONS 16.
1.In RF restricted Environments 17. 2.Hospitals(In few medical
instruments) 18. In vehicles and traffic lights,reducing accidents
and traffic congestion 19. Street lamps(as free access points) 20.
In Aircraft cabins 21. 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
