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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 ResearchIsroli-Afva,Bardoli

2Content:-

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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Introductionto Li-Fi

4Introduction 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.

5Introduction(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

7History 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.

8Histroy(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 ??

10Present 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 ???

13Working 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.

14Working(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.

15Architecture of Li-Fi

16Li-Fi Environment

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Li-Fi V/S Wi-Fi.

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Application of

Li-Fi

21In Education Systems:

Li-Fi is the latest technology that can provide fastest speed internet access.

22In 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

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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

27 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!!