Li-Fi(Light Fidelity)-The Future Technology in Wireless

Communication

PREPARED BY:-

SANTOSH LADANI (CSE, FETR)

AKSHAY PANCHAL (CSE, FETR)

GUIDED BY:-

PROF. VIVEK JOSHI(CSE,FETR)

Faculty of Engineering Technology and Research

Isroli-Afva,Bardoli 1

Content:-

Introduction of Li-Fi

History of Li-Fi

Why Li-Fi ???

How Li-Fi Works ??

Li-Fi v/s Wi-Fi

Application of Li-Fi

Advantages of Li-Fi

Limitation of Li-Fi

Conclusion

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Introduction

to Li-Fi

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Introduction to Li-Fi

Li-Fi basically known as “Light Fidelity” is an outcome of 21st

century.

The basic ideology behind this technology is that the data can be transmitted through the LED light whose intensity varies even faster than the Human-eyes.

As the transmission of the data takes place through the light emitting diodes the amount is comparatively small.

In modern times, it is called as the optimized version of WI-FI .The advantageous thing is the wireless communication which decreases the cost enormously.

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Introduction(Cont….)

there are more and more devices coming up

day-by-day the signals of Wi-Fi are being clogged

up due to heavy traffic, there arised a need for

an error free transmission technology. And the

solution to this problem was the Li-Fi technology.

With LIFI is possible to encode the data into the

light by varying the rate at which the LED’s flicker

ON and OFF which is too quickly to be noticed by the human eye.

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History

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History of Li-Fi Professor Harald Haas, from the University

of Edinburgh in the UK, is widely recognised as the original founder of Li-

Fi. He coined the term Li- Fi and is Chair man of Mobile Communications at the University of Edinburgh and co-founder of pure LiFi.

The consortium believes it is possible to achieve more than 10Gbps speed using this optical wireless technology also known as Li-Fi.

It gets affected if line of sight is not used, the speed of data transmission will reduce or data transmission will stop.

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Histroy(cont…) PureLiFi, formerly pureVLC, is an original

equipment manufacturer (OEM) firm set up to commercialize Li-Fi products for integration with existing LED-lighting systems.

Philips lighting company has developed a VLC system for shoppers at stores. They have to download an app on their smartphone and then their smartphone works with the LEDs in the store. The LEDs can pinpoint where they are at in the store and give them corresponding coupons and information based on where aisle they are on and what they are looking at.

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Why Li-Fi ??

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Present Scenario

More than 1.8 Million more than 5 Billion

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.

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Different Electromagnetic

Spectrums and their potentiality

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How Li-Fi

Works ???

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Working of Li-Fi

This fantabulous idea first striked the mind of Haraald Haas from University of Edinburgh, UK, in his TED Global talk on VLC.His idea was very simple that if the LED is “on” then the digital 1 can be transmitted and if the led is “off” then the digital 0 can be transmitted.Led‟s can be switched on and off very quick.

For transmitting data this way all that we require is LED‟s and controller that code data into LED‟s.Parallel data transmission can be done by using array of LED‟s or by using red, green, blue LED‟s to alter light frequency with the frequency of different data channel.

Advancements and enhancements in this field generate a speed of 10 gbps! But amazingly fast data rates and lowering band widths are not the only reasons that enhance this technology.

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Working(Cont…) Lifi usually is based on light and so it can be probably

implemented in articrafts and hospitals that are prone to

inference from radio waves.unlike Wi-Fi Li-Fi can work

even under-water which makes it more advantageous for

military operations.

Radio waves are replaced by light waves in data

transmission called Li- Fi.

The data transmission is done through binary codes which involve switching on LED can be done by logic 1 and

switch off using logic 0.

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Architecture of Li-Fi 15

Li-Fi Environment 16

Li-Fi V/S Wi-Fi.

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Application of

Li-Fi

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In Education Systems: Li-Fi is the latest technology that can provide fastest

speed internet access.

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In Medical Application Operation theatres (OTs) do not allow

Wi-Fi due to radiation concerns. Usage

of Wi-Fi at hospitals interferes with the

mobile and pc which blocks the

signals for monitoring equipments. So,

it may be hazardous to the patient's

health.

To overcome this and to make OT tech

savvy Li-Fi can be used to accessing

internet and to control medical

equipments. This can even be

beneficial for robotic surgeries and

other automated procedures.

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Cheaper Internet in Aircraft

The passengers travelling in aircrafts get access to

low speed internet at a very high rate. Also Wi-Fi is

not used because it may interfere with the

navigational systems of the pilots.

In aircrafts Li-Fi can be used for data transmission. Li-Fi can easily provide high speed internet via

every light source such as overhead reading bulb,

etc. present inside the airplane.

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Cheaper Internet in Aircraft 24

Replacement of other

technologies Li-Fi does’t work using radio waves. So, it can be easily

used in the places where Bluetooth, infrared, Wi-Fi, etc.

are banned.

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Advantages of Li-Fi

High Security

Easy To Use

Fast Data Transfer

Reliable

Harmless ness

Low Cost

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Some Disadvantages of Li-Fi

Light can’t pass through objects.

Connectivity while moving.

Interferences from external light sources like sun

light, normal bulbs, and opaque materials in the path of transmission will cause interruption in the communication.

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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.

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Thank you!!

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