The document presents a seminar on Li-Fi technology, discussing its need as an alternative to traditional wireless communication due to radio spectrum issues. It covers how Li-Fi works, its block diagram, advantages, applications, and challenges such as connectivity while moving and multiuser support. The conclusion emphasizes the potential of Li-Fi to offer a cleaner, safer, and more efficient wireless data transmission method using LED lights.

1. A
SEMINAR
ON
LI-FI TECHNOLOGY
Supervisor To: Submitted By
Ms. Payal Mittal Sirod kumar
Department of Electronics & Communication Engineering
Jaipur National University, Jaipur 1

2. CONTENTS
PRESENT SCENERIO
WHY VLC ?
INTRODUCTION TO LIFI
HOW LIFI WORKS
BLOCK DIAGRAM
A PROJECT ON LIFI TECHNOLOGY
ADVANTAGES OF LIFI
APPLICATIONS
CHALLENGING PROBLEMS
CONCLUSION
2

3. Present Wireless Communication
• Radio spectrum
• 1.4 Million base stations
• 5 billion Mobile stations
Issues regarding Radio
spectrum
Security
3

4. WHO CAN REPLACE
RADIO WAVES FOR
WIRELESS COMMUNICATION ?
4

5. Is not used
generally
Used for
hospitals
Dangerous for
human body
Expensive,
Limited BW
Less Secure
Which is not used so far
Safe to use Larger bandwidth
Low power
Applications
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6. Delivering
6

7. o1
 If the LED is on, you transmit a digital 1, if it's off you transmit a digital 0.
 They can be switched on and off very quickly, which gives nice opportunities
for transmitting data.
HOW LI-FI WORKS ?
7

8. BLOCK DIAGRAM
Data
Modulation
(FSK)
Light
Source
Data
Demodulation
(FSK)
Photo
Detector
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9. DIGITAL MODULATION TECH.
ON
OFF
THRES
INTENSITY
TIME
1 0 1 0 0 0 1 0 1 1
FINITE SLOPE LIMITS
ACHIEVING DATA RATES
PULSE MODULATION SUCH AS ON OFF KEYING
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10. AN LIFI PROJECT CONSTRUCTION
• AMPLIFIER
• CIRCUIT
LED DRIVER CIRCUIT
s I R O D
RAMUK
MICROCONTROLLER CIRCUIT
SIROD KUMAR
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11. LIFI TX AND RX
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12. MY PROTOTYPE
LIFI TX LIFI RX
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13. ADVANTAGES:-
Large bandwidth
High security
Fast data transfer
Reliable
Harmlessness (free from
radio wave)
Low cost
No interference on RF
signals
Easy To Use
13

14. CHALLENGING PROBLEMS:-
Presence of light is essential
Shadowing
 Connectivity while moving
Multiuser support
Works better with fluorescent
light & led but very low
efficiency with bulbs
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15. SOLUTION TO CHALLENGING PROBLEM
Connectivity while moving :-
BASE1BASE2
MS
BASE1BASE2
MS
BEFORE HANDOFF AFTER HANDOFF
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16. SOLUTION TO CHALLENGING PROBLEM
Solution for multiuser support
10101110010100010
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17. APPLICATION
Where other transmission or
frequencies could be hazardous:-
 Used in petroleum or chemical
plants
 Used in aircrafts
 Used in medical areas
 Used in seminar-hall, home,
office
 Used in street lamp as open
hotspot Wi-Fi
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18. CONCLUSION
This technology in which LED is working like a WI-
FI hotspot to transmit wireless data ,moves toward
the cleaner, GREENER, safer( from radio
waves) and brighter future.
18

19. &
ANY ????
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