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ABHISHEK PRASADREGN NO: 1201287345

PROF SUBHDRA PRADHAN

Gandhi Institute For Technological Advancement, Bhubaneswar

LI-FI (LIGHT FIDELITY)

Presented by

GUIDED BY:

DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING

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ABOUT AUTHORSThis paper is published by:

INTERNATIONAL JOURNAL OF ENGINEERING DEVELOPMENT AND RESEARCH (IJEDR)

On Two Day National Conference(RTEECE- 2014) – 17th, 18th January 2014

• Jay H. Bhut (Electronics & Communication Engineering, Marwadi Education Foundation, Rajkot, India)

• Dharmrajsinhg N. Parmar ( Communication System Engineering, Charusat University, Changa,India)

• Khushbu V. Mehta (Electronics & Communication Engineering, Marwadi Education Foundation, Rajkot, India)

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CONTENT1. INTRODUCTION

2. HISTORY

3. PRESENT TECHNOLOGY

4. ISSUES REGARDING RADIOSPECTRUM

5. HOW LI-FI WORKS ??

6. WHY ONLY VLC ??

7. ARCHITECTURE

8. APPLICATION OF LI-FI ??

9. COMPARISION

10. MERITS & DEMIRTS

11.CONCLUSION

12. REFERENCE

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Li-Fi can be thought f as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information.

And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information.

LI-FI is transmission of data through illumination ie sending data through a LED light bulb.

INTRODUCTION

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Professor Harald Haas , is widely recognised as the original founder of Li-Fi.

The technology truly began during the 1990's in countries like Germany, Korea, and Japan where they discovered LED's could be retrofitted to send information. 

Harald Haas continues to wow the world with the potential to use light for communication

HISTORY

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1.4 MILLION 5 BILLION

PRESENT TECHNOLOGY

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Radio Spectrum is congested but the demand for wireless data double each

year .Every thing, it seems want to use wireless data but the capacity is drying

up.

1.4 Million base stations, 5 billion Mobile stations

600tb data every month

So what can carry this excess demand in the future .

PRESENT TECHNOLOGY

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EFFICIENCY

AVAILABILITY

CAPACITY

SECURITY

ISSUES REGARDING RADIOSPECTRUM

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WHO CAN REPLACERADIO WAVES FOR

WIRELESSCOMMUNICATION ?

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operational procedure is very simple, if the led is on, you transmit a digital 1, if its off you transmit a 0.

The LEDs can be switched ON and OFF very quickly, which gives nice opportunities for transmitting data.

Thus every light source will Works as a hub for data transmission

HOW LI-FI WORKS ??

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Gama rays cant be used as they could be dangerous.

X-rays have similar health issues.

Ultraviolet light is good for place without people, but other wise dangerous for the human body.

Infrared, due to eye safety regulation, can only be used with low power.

HENCE WE LEFT WITH THE ONLY THE VISIBLE - LIGHT SPECTRUM

WHY ONLY VLC ??

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ARCHITECTURE

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Li-Fi technology is still in its infancy. However some areas where it seems perfectly applicable are:-

1. TRAFFIC LIGHTS

Traffic lights can

communicate to the car and

with each other.

Cars have LED-based

headlights, LED-based cack

lights, and cars can

communicate with each other

and prevent accidents in by

exchanging information

APPLICATIONS OF LI-FI

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2. IN RF RESTRICTED AREA

Visible Light is more safe than RF, hence it can be used in places where RF can't be used such as petrochemical plants.

3. PUBLIC INTERNET HOTSPOT

There are millions of street lamps deployed around the world.

Each of these street lamps could be a free access point.

APPLICATIONS OF LI-FI

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4. ON OCEAN BEDS

Li-Fi can even wok underwater were Wi-Fi fails completely, thereby throwing open endless opportunities for military/navigation operations.

5. IN AIRCRAFT CABINS

Whenever we travel through airways we face the problem in communication media ,because the whole airways communication are performed on the basis of radio waves

APPLICATIONS OF LI-FI

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COMPARISION

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MERITS LIMITATION

High Security Light can't pass through objects.

Fast Data Transfer Connectivity while moving

Harmless ness High installation cost of the VLC systems

Reliable Interferences from external light sources

MERITS & DEMIRTS

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The possibilities are numerous and can be explored

further. If This technology can be put into practical

use, every bulb can be used something like a Wi-Fi

hotspot to transmit wireless data and we will proceed

toward the cleaner, greener, safer and brighter future.

CONCLUSION

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REFERENCE INTERNATIONAL JOURNAL OF

ENGINEERING DEVELOPMENT AND

RESEARCH (IJEDR)

Jay H. Bhut

Dharmrajsinhg N. Parmar

Khushbu V. Mehta

Wikipedia

Digital Trends .htm

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THANK

YOU