lifi technology light feadility animated presentation
TRANSCRIPT
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A SEMINAR
ON LI-FI TECHNOLOGY
Supervisor To: Submitted By Ms. Payal Mittal Sirod kumar
Department of Electronics & Communication EngineeringJaipur National University, Jaipur
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CONTENTSPRESENT SCENERIOWHY VLC ?INTRODUCTION TO LIFIHOW LIFI WORKSBLOCK DIAGRAMA PROJECT ON LIFI TECHNOLOGYADVANTAGES OF LIFIAPPLICATIONSCHALLENGING PROBLEMSCONCLUSION
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Present Wireless Communication• Radio spectrum• 1.4 Million base stations• 5 billion Mobile stations
Issues regarding Radio spectrum
Security
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WHO CAN REPLACE
RADIO WAVES FOR
WIRELESS COMMUNICATION ?
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Is not used generallyUsed for
hospitalsDangerous for human body
Expensive, Limited BWLess Secure
Which is not used so farSafe to use Larger bandwidth
Low power Applications
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Delivering
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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 ?
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BLOCK DIAGRAM
Data
Modulatio
n(FSK)
Light Sour
ce
Data Demodulation(FSK) Photo Detector
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DIGITAL MODULATION TECH.
ON
OFF
THRES
INTENSITY
TIME1 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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AN LIFI PROJECT CONSTRUCTION
• AMPLIFIER• CIRCUIT
LED DRIVER CIRCUIT
s I R O D
RAMUK
MICROCONTROLLER CIRCUIT
SIROD KUMAR
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LIFI TX AND RX
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MY PROTOTYPE
LIFI TX LIFI RX
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ADVANTAGES:-
Large bandwidthHigh securityFast data transferReliableHarmlessness (free from
radio wave)Low costNo interference on RF
signalsEasy To Use
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CHALLENGING PROBLEMS:-
Presence of light is essentialShadowing Connectivity while movingMultiuser supportWorks better with fluorescent light & led but very low efficiency with bulbs
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SOLUTION TO CHALLENGING PROBLEM
Connectivity while moving :-
BASE1BASE2MS
BASE1BASE2MS
BEFORE HANDOFF AFTER HANDOFF
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SOLUTION TO CHALLENGING PROBLEM
Solution for multiuser support
10101110010100010
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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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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.
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&ANY ????