A seminar on Li-Fi Technology

1. A SEMINAR ON
LIFIA future technology in wireless
communications
Meghnad Saha Institute of Technology

2. PRESENTED BY THE FOLLOWING 3RD YEAR ECE STUDENTS
1. Sarmishtha Basak
2. Kaushik Chakrabarti
3. Chandradeep Chakravarti
4. Joshita Ghatak
Meghnad Saha Institute of Technology

3. UNDER THE GUIDANCE OF
Prof. Oindri Ray, Department of ECE
Meghnad Saha Institute of Technology

4. CONTENTS
1.INTRODUCTION
2.HISTORY
3.ISSUE REGARDING RADIO SPECTRUM
4.WORKING PROCESS
5.FEATURES
6.APPLICATIONS
7.ADVANTAGES
8.DISADVANTAGES
9.CONCLUSION
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5. LI -FI
 Light Fidelity
 Transmission of data through illumination.
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6. Li-Fi
 Carrier is light
 Transceiver-fitted LED
lamps are used
BASIC DIFFERENCE FROM WIFI
Wi-Fi
 Carrier is Radio wave
 Wi-Fi modems are
used
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7. Inventor of Li-Fi
HISTORY
Harald Hass
Meghnad Saha Institute of Technology

8.  12th July 2011: He used a table lamp with an LED
 TED Global: Haas demonstrated a data rate of transmission of
around 10Mbps.
 2011: He achieved 800Mbps.
RESEARCH OF PROF. HASS
SO A PROVEN TECHNOLOGY
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9. AvailabilityCapacity
Efficiency Security
Issues with Radio Spectrum
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10. ONLY LEFT IS THE VISIBLE - LIGHT SPECTRUM
WAVES USABLE WHY
GAMA RAYS Radioactive and dangerous for
health
X-RAYS Similar health issues
UV RAYS Harmful for skin and can’t be use
for long duration
INFRARED WAVE Eye safety regulations and only be
used in low power
Radio waves Expensive, energy consuming
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11. Meghnad Saha Institute of Technology

12. Light based Wi-Fi
Thus Every light source is a
Hub
LED on= 1
LED off= 0
Operating speed of LED <1 μs
BASIC CONCEPTS
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13. MECHANISM
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14. Meghnad Saha Institute of Technology

15. LIFI HAS THE UPPERHAND DUE TO PARALLAL DATA TRANSMISSION
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16. WORKING MODELS
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17. Primary sub-assemblies:
• Bulb
• RF power amplifier circuit (PA)
• Printed circuit board (PCB)
• Enclosure
CONSTRUCTION
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18. IMPLEMENTATION
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19. LI-FI vs. WI-FI
S. No. Parameter Li-fi Wi-fi
1 SPEED > 1 GB/S around 150 Mb/s
2 Medium of data
transfer
Use light as
carrier
Use radio spectrum
3 Spectrum range Visible light has
10000 times
more
Having less
spectrum range
than VLC
4 Cost Cheaper Expensive
5 Network topology Point to point Point to point
6 Operating
frequency
Hundreds of
Tera Hz
2.4 GHz
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20. COMPARISON WITH OTHER TECHNOLOGIES
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21. POTENTIAL APPLICATIONS
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22. DAILY LIFE WITH LI-FI
POTENTIAL APPLICATIONS
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23. POTENTIAL APPLICATIONS
IN RF RESTRICTED ENVIRONMENTS
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24. POTENTIAL APPLICATIONS
IN AIRCRAFT CABINS
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25. POTENTIAL APPLICATIONS
USE IN OPERATION THEATER
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26. TRAFFIC CONTROL
POTENTIAL APPLICATIONS
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27. STREET LAMPS AS FREE ACESS POINTS
POTENTIAL APPLICATIONS
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28. 1.Availability
2.Efficiency
3.High Security
4.Easy to Use
5.Fast data
transfer
6.Harmless
7.Low cost
ADVANTAGES
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29. 1. PRESENCE OF LIGHT IS ESSENTIAL
2. WORKS BETTER IN LED BUT VERY LOW EFFICIENCY WITH BULBS
4. VISIBLE LIGHT CAN’T PENETRATE THROUGH SOLID OBJECTS
LIMITATIONS
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30. CONCLUSION
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31. Meghnad Saha Institute of Technology