Presentation On

Li-Fi

Presented By-:

Er. Vivek Kumar(vikkusingh20121314@gmail.com)

CONTENTS HISTORY INTRODUCTION TO LI-FI HOW DOES IT WORKS? COMPARISON WITH WI-FI OVERCOMING THE 4 ISSUES WITH RADIOWAVE

IN LI-FI APPLICATION OF LI-FI Advantages of LiFi Limitations of LiFi Conclusion

HISTORY 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.

German physicist Dr. Harald Haas, has started working on transmission of data using visible light back in 2004.

In the year 2011 he first introduced to the world this new technology ,LI FI in the TED talk show.

He envisions a future where data for laptops and other mobile devices is transmitted through a light in a room.

INTRODUCTION This technology was invented by GERMAN

PHYSICIST HARALD HAAS , from the university of EDINBURGH ,U.K .

LI-FI stands for LIGHT FIDELITY and LI-FI is transmission technology of data through ILLUMINATION.

Based on VISIBLE LIGHT COMMUNICATION(VLC). VLC is a data communication medium, which uses the

visible light between 400 THz to 800 THz (375 nm) as optical carrier for data transmission.

INTRODUCTION LI FI (light fidelity) is data through illumination-

taking the fiber out of fiber optics by sending data through an LED light bulb that varies in intensity faster than the human eye can notice.

At the heart of this technology is a new generation of high brightness LEDs.

If the LED is on a digital 1 is transmitted, if the LED is off then a digital 0 is transmitted.They can be switched on and off in order to transmit data continuously.

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. Hence all that us required is some LEDS and a controller thatcode data into those LEDs. We have to just vary the rate at which the LED’sflicker depending upon the data we want to encode

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

HOW DOES LI-FI WORKS?

HOW DOES LI-FI WORKS?

COMPARISON WITH WI-FI

Characteristic Wi-Fi Li-FiFrequency 5 GHz No frequency for light

Standard IEEE 802.11 IEEE 802.15

Range 100 meters Base on LED light

Primary application Wireless local area networkingCost Low Medium high

Wireless local area networking

Data transfer rate 800 Kbps - 11 Mbps >1Gbps

Power consumption Medium Low

Cost Medium High

Security Its medium secure Its high secure

Characteristic Wi-Fi Li-FiPrimary devices Notebook computers,

desktopcomputers, servers, TV, Latest Wi-Fimobiles.

Mobile phones, office and industrialautomatic devices, notebookcomputers, desktop computers, servers computers, TV and latestupcoming devices with Li-Fi

Primary users Corporate campus users, homes andothers public places

Traveling employees, home users, others public places ,office andindustrial workers

Usage location With in range of WLANinfrastructure, usually inside a Building

Where ever light is available, it maya public place ,home, office and roadEtc

Development started 1990 2011

COMPARISON WITH WI-FI

OVERCOMING THE 4 ISSUES WITH RADIOWAVE IN LI-FI

Capacity

Availability

Efficiency

Security

APPLICATION OF LI-FI

Traffic Control By Li-Fi

Airlines

Advantages of Li-Fi

You Can Use Li-Fi In Hospitals And Aircrafts Also. Cheaper Then WiFi , Since Visible Light Spectrum Is A Free

Spectrum Band. No License Needed. Thousands And Millions Of Street Lamps Can Be Converted

To Li-fi Spots. Light Is Readily Available In Every Part Of The World. This Makes It Easy For People In Airplanes To Work On The

Internet. There Are An Estimated 14 Billion Light Sources On Earth

And Each Can Be Easily Converted Into A Li-Fi Hotspot.

Limitations of Li-Fi

There should be line of sight between sender and receiver

Visible light cannot penetrate through solid objects

Interference with other electromagnetic waves makes the

transmitting data to distort Light cannot approach the range and penetration of radio waves High installation cost of the VLC systems A major challenge facing Li-Fi is how the receiving device will

transmit back to transmitter. Interferences from external light sources like sun light, normal

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

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 Wi-Fi

hotspot to transmit wireless data and we will

proceed onwards the..

Cleaner, Greener, Safer and Brighter future.

Conclusion

THANK YOU

ANY QUERIES……..