lifi technology light feadility animated presentation

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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 ????