LI-FILIGHT FIDELITY

PRESENTED BY

PRABHU KIRAN(ECE_4A)

ROLL NO:11621A0407

CONTENTS

INTRODUCTION HISTORY CONSTRUCTION OF LI-FI HOW DOE’S IT WORKS? LI-FI VS WIFI APPLICATIONS ADVANTAGES LIMITATIONS CONCLUSION

INTRODUCTION

Li-Fi is technology that uses LED's for transmit data wirelessly .

Li-Fi means “LIGHT FIDELITY”.

Li-Fi is fast and cheap fiber version that use Visible Light Communication(VLC) .

Contd……..

VLC is a data communication that uses visible light for data transmission.

Visible light ranges from 400THz(780nm) to 800THz(375nm).

Its act as transceiver and also used for lighting the room.

LI-FI ENVIRONMENT

HISTORY

In 1990’s countries like Germany, Korea and Japan found this.

They discovered that led’s are retrofitted to send information.

Porf. Harald Haas worked on it to improve this technology.

Contd….

On 12th July 2011 he successfully demonstrated his new invention.

He used a led table lamp for streaming a hd video with a speed of 10mbps.

In the middle he blocked the lamp to prove that lamp was source of data.

Contd….

At ted global talks he demonstrated with 10mbps.

Which is fairly good than UK broadband connection .

Later after two months he achieved a speed of 123mbps

HARALD HAAS

Prof. Harald Haas is physicist at University of Edinburgh in UK.

CONSTRUCTION OF LI-FI

The Li-Fi consists of 4-primary sub-assemblies . They are

Bulb

RF power amplifier circuit (PA)

Printed Circuited Board (PCB)

Enclosure.

Construction diagram

Block Diagram

HOW DOES IT WORKS?

LI-FI VS WIFI

PRESENT SENERIO

ELECTRO MAGNETI SPETRUM

LI-FI HAS AN UPPERHAND DUE TO PARALLEL DATA TRANSMISSION

APPLICATIONS

Airways Green information technology Free from frequency bandwidth

problems Lighting points used as hotspots Smart power plants Underwater awesomeness Medical field (for some instruments)

Contd….. Airways Green information

technology

Lighting point as hotspot

Contd…. Smart power plant Underwater

awesomeness

Medical field

Other areas where we can use li-fi

Traffic lights

Street lights

Shopping malls

Educational organizations

Home

Transport systems

Advantages High speed Low cost Easy to use Harmless Fast data transfer

Limitations Can’t pass through wall

External interference

High installation cost for VLC system

Still need wi-fi

Future scope We can transmit data very high speed due to

parallel transmission. And we can reduce the use of power for modems and Wi-Fi routers. We are not to worry about high internet bills. By 2018 we can use a high speed internet of 10gbps with we can download a hd movie in 30seconds. We can reduce the radiation and global warming

conclusion The possibilities are numerous and can be explored further. If his

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. The concept of Li-Fi is currently attracting a great deal of interest, not least because it may offer a genuine and very efficient alternative to radio-based wireless. As a growing number of people and their many devices access wireless internet, the airwaves are becoming increasingly clogged, making it more and more difficult to get a reliable, high-speed signal. This may solve issues such as the shortage of radio-frequency bandwidth and also allow internet where traditional radio based wireless isn’t allowed such as aircraft or hospitals. One of the shortcomings however is that it only work in direct line of sight.

References Wiki/Li-Fi(

http://en.wikipedia.org/wiki/Li-Fi)

Ted global talks/talks/Harald Haas

http://slideshare.com/li-fitech.html

seminarprojects.com/s/seminar-report-on-lifi

Thanking you