International Journal of IT, Engineering and Applied Sciences Research (IJIEASR) ISSN: 2319-4413 Volume 2, No. 4, April 2013

i-Xplore International Research Journal Consortium www.irjcjournals.org

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A Comparative and Critical technical Study of the Li-Fi – (A

Future Communication) V/S Wi-Fi

Prof. (Dr.) Y.P.Singh, Director, KLS Institute of Engineering & Technology, Chandok, Bijnor U.P.

ABSTRACT

Now a days with the advent of technology,, communication

became the backbone of ICT. ICT had made our globe like

a town. Today everyone (Businees,institutions

,organizations ,entreprenuers is thrust for getting right

information at the right time and right place .Which,

requires fast internet connectivity, Technology and large

spectrum of channels. Present paper reflects the Future of

Communication (LI-FI) which may affect all lives. It a

technology that may be as fast as 500MBPS (30GBPS per

minute) an alternative, cost effective and more robust and

useful than Wi-Fi. The Visible light communication which

may be the future of Internet

Keywords Wi-Fi, Li- Fi, VLC, Visible light communication, ICT.

MBPS, VLC transmitter, photo detector, amplification and

processing, data utilization, server, lamp driver, LED

based headlights, LED based backlights, penetrate

through wall

INTRODUCTION

Internet services are very very highly demanding and

essential accessories in ICT. As per the Cisco Survey of

the usability of the existing spectrum, we are presently

using about 80% of the existing capabilities of the data

utilization. Presently we are utilizing the Wi-Fi services

within the campus and around the 10-100 meter distances

to connect our P.C., Laptops, palmtops and P.C. notes etc.

Present paper deals with the visible light communication

which may provide a wide and fast data rate like

something 500MBPS. Study made comparison between

WI-Fi and LI-Fi. And other important parameters of the

communication process.

LITERATURE REVIEW AND

ADOPTABILITY OF Li-Fi

It was July,2011 , Dr. Herald Hass ,Professor , mobile

communication ,University of Edinburgh, publicly

demonstrated Light fidelity for the first time, a method of

Visible light communication (VLC) technology.further

Researchers at the Heinrich Hertz institute in Berlin,

Germany have reached data rates of over 500 MBPS using

a standard white light LED. Dr. Herald Hass also has setup

a spin-off firm to sell a VLC transmitter.Even more

sophisticated and advance techniques are undergoing

development at the University of oxford and the

University of Edinburgh. Teams from University of oxford

and University of Edinburgh are focusing on parallel data

transmission using arrays of LEDs, where each LED

transmits a different data stream while other groups are

mixtures of red, green and blue LEDs to alter the light’s

frequency, with each frequency encoding a data channel.

Today researchers are working for its feasibility and

designing the hardware equipments required for making

the technology robust and usable.

Li-FI- technology has higher potential, it is very much

possible to transmit the data via light by changing the

flicker rate that provide different strings of 1 and 0, and its

intensity is modulated so quickly that the human eyes

cannot notice. There are around 19 billion light emits

worldwide. Which in turns may be replaced by LED, i.e.

potential source of transmitting data? “At the heart of this

technology is a new generation of high brightness (LED)

light emitting diodes,” says Herald Hass, from the

University of Edinburg, U.K. Very simply, if the LED is

on, you transmit a digital 1 if it’s off, you transmit a 0,

“They can be switched on and off very quickly, which

gives nice opportunities for connectivity and transfer the

data very quickly, efficiently and accurate without any

external hindrances.

TECHNICAL PRESENTATION OF THE

VISIBLE LIGHT COMMUNICATION

LIGHT FIDELITY

Diagram mentioned below shows the topological

representation how the LI-FI will work in the offices and

work place. Diagram shows that how the visual light

communication communicates to connect the different

devices and media and also shows the probable path of the

communication and of course transmitting the data and

audio-video signals. In addition to how the peripheral

devices may be utilized optimally.

International Journal of IT, Engineering and Applied Sciences Research (IJIEASR) ISSN: 2319-4413 Volume 2, No. 4, April 2013

i-Xplore International Research Journal Consortium www.irjcjournals.org

25

How Does Light Fidelity Technology work

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International Journal of IT, Engineering and Applied Sciences Research (IJIEASR) ISSN: 2319-4413 Volume 2, No. 4, April 2013

i-Xplore International Research Journal Consortium www.irjcjournals.org

26

This technology has higher potential, it is very much

possible to transmit the data via light by changing the

flicker rate that gives different stings of 1 and 0, and its

intensity is modulated so quickly that the human eyes

cannot notice.

APPLICATION of LI-FI & ITS

ADVANTAGES OVER Wi-Fi

1 High speed, as high as 500mbps or 30GB per minute

2. Li- Fi uses light rather than radio frequency signals,

3. VLC could be used safely in aircraft,

4. Integrated into medical devices and in hospitals as this

technology does not deal with radio waves, so it can easily

be used in such places where Bluetooth, infrared, Wi-Fi

and internet are banned. In this way, it will be most

helpful transferring medium for us.

5. Under water in sea Wi-Fi does not work at.

6. There are around 19 billion bulbs worldwide, they just

need to be replaced with LED ones that transmit data. We

reckon VLC is at a factor of ten, cheaper than WI-FI.

7. Security is another benefit, he points out, since light

does not penetrate through walls.

8. In streets for traffic control. Cars have LED based

headlights, LED based backlights, and Car can

communicate each other and prevent accidents in the way

that they exchange Information. Traffic light can

communicate to the car and so on.

9. By implementing the Technology worldwide every

street lamp would be a free access point.

10. Li-Fi may solve issues such as the shortage of radio

frequency bandwidth.

DISADVANTAGES

Still there are some backdrops like it can only transmit

when in the line of sight well it can be sorted out someday

I hope. “There has been a lot of early hype, and there are

some very good applications”.

CONCLUSION

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. 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,

on one way, it can transmit the data at higher rate and on

the other it is very cheap as compared with WI-FI .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.

REFERENCES

[1] seminarprojects.com/s/seminar-report-on-lifi

[2] http://en.wikipedia.org/wiki/Li-Fi

[3]http://teleinfobd.blogspot.in/2012/01/what-is-lifi.html

[4]technopits.blogspot.comtechnology.cgap.org/2012/01

/ 11/a-lifi-world/

[5] www.lificonsortium.org/

[6] the-gadgeteer.com/2011/08/29/li-fi-internet-at-the

speed- Of-light/

[7] en.wikipedia.org/wiki/Li-Fi

[8]www.macmillandictionary.com/buzzword/entries/Li-

Fi.html

[9] dvice.com/archives/2012/08/lifi-ten-ways-i.php

[10] Will Li-Fi be the new Wi-Fi?, New Scientist, by

Jamie Condliffe, dated 28 July 2011

[11] http://www.digplanet.com/wiki/Li-Fi

[12] ”Visible-light communication: Tripping the light

fantastic: A fast and cheap optical version of Wi-Fi

is coming”, Economist, dated 28Jan 2012

ABOUT THE AUTHOR Prof. Y.P. Singh, currently working as Director, KLS

Institute of Engg.& Technology, Chandok, Bijnor U.P. has

also worked about 27 years as Lecturer, Dean of

academics & Principal in many Engineering institutions

and organization. He has also served with Training and

Technical Deptt. Govt.Of Delhi, almost for 17 years. He

has about 33 research paper published in National and 12

papers published in international journals in his credit. He

has been selected and awarded by Govt. of Delhi as “Best

Technical Teacher-2004”.He is also an expert and Master

Trainer for the Teachers, empanelled by SCERT/NCERT.

He is also the guide of research scholar for almost dozen

of Universities.