li-fi a complete presentation

SOLUTION FOR SLOW INTERNET

PRESENTED BY

NISHANTH CHANDRAN

LIFI

INTRODUCTION

Li-Fi(Light Fidelity) basically the sending of the digital signals via light.

It work's better in comparison to conventional approaches

Li-Fi technology was invented by Harald Haas,

It gives nice opportunities for transmitting data,it is practically feasible to encode the digital data in the light by altering the data rate at which the LEDs flicker's ON and OFF to give the various numerous strings of digital Is and Os.

WHAT IS LIFI

Li-Fi is the transmission of data through illumination by taking the fiber out of fiber optics by sending data through a LED light bulb.

This varies in intensity faster than human eye can follow.

It is the fast and cheap wireless communication system which is optical which is optical version of the Wi-Fi.

NEED FOR LIFI

Radio spectrum is congested, but the demand for wireless data doubles each year Issues regarding radio spectrum, such as capacity, availability, efficiency, security are solved using LIFI. Speed of data transmission can be increased.

EXISTING SYSTEM

WIFI

HSPA

LAN

Wired Connections

OVERCOMING WIFI ISSUES

CAPACITYSpectrum is 10,000 times greater than that of radio frequency EFFICIENCYHighly efficient since LED consumes less energy AVAILABILITYLight waves available everywhere. SECURITYCannot penetrate through walls. Hence data cannot be intercepted.

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

on 12th July 2011. He used a table lamp with an LED bulb to transmit a video of blooming flowers that was then projected onto a screen behind him. During the event he periodically blocked the light from lamp to prove that the lamp was indeed the source of incoming data.

HOW DOES LIFI WORK

Cont..

THE HEART OF THIS TECHNOLOGY IS A NEW GENERATION HIGH BRIGHTNESS LED’S.

THESE LED’S VARIES IN INTENSITY (THAT IS GETS ON AND OFF) SO FAST THAT A HUMAN EYE CANNOT DETECT IT.

IF LED IS ON , THEN WE TRANSMIT A DIGITAL SIGNAL 1,AND IF THE LED IS OFF , THEN WE TRANSMIT A DIGITAL SIGNAL 0.

A CONTROLLER IS CONNECTED AT THE BACK SIDE OF THESE LED BULBS TO CODE DATA TO THESE LED’S.

IMPLEMENTATION

All the data from Internet is streamed into lamp driver.Data from internet is used to modulate the intensity of

LED light source.Thus by fast and subtle variations of current, optical

output can be made to vary at extremely high speedThe photodetector picks up the signalThe receiver dongle then converts the tiny changes in

amplitude into a data stream.

Cont..

LIFI VS. WIFI

LI-FI NETWORKS

Li-Fi connector and router are the main components for a network

Room connector: Optical signals cannot penetrate through walls, in order to provide an

optical WLAN, rooms need to be connected with each other Li-Fi room connector is a replicator, which sends the data stream

from one side of the wall to the other side via an optical fiber. For smaller rooms, connector act as the only Li-Fi hotspot in the

room

LI-FI ROUTER

Serves as a connector to external link like DSL. Covers a radius of about 20 meters The transmission speed is 100 Mbps. Suitable for small office or home use

APPLICATIONS

LIFI can be used in sensitive areas such as aircrafts for data transmission without

causing interference Places where it is difficult to lay optical fibers like operation

theaters Traffic scenarios, thereby reducing accidents Underwater applications where radio waves cannot

propagate. Industries like petrochemical plants, nuclear power plants ,

petrol pumps etc

TRAFFIC SCENARIO

In traffic scenario, LIFI can be used to communicate with the LED lights of cars .

Cars can have LED-based headlights, backlights and can communicate with each other.

This might prevent accidents, by exchanging information, when the vehicles are too close

Using LIFI, Street lights can be used to send information about the road condition to the car.

HOME AND SMALL OFFICES

In home and small offices, Li-Fi can be used to communicate with devices like

Laptops Internet access HD video streaming Printer

ADVANTAGES

Data rate greater than 10 Gbps; Theoretically allowing HD film to be downloaded in 30 seconds Can be used anywhere, even in RF restricted areas; Since light waves will not interfere with radio waves. Mostly LED light bulbs are used, which consumes less energy. Hence cost efficient. As light waves cannot penetrate through walls, the data cannot be intercepted; Thus provides secured communication. Efficient alternative to radio based wireless; since it is quick and reliable.

LIMITATIONS

Visible light cannot penetrate through solid objects. A major challenge of LiFi is how the receiving device will transmit back to transmitter. Interferences from external light sources like sunlight, in the path of transmission will cause interruption in the communication. Data transmission can be easily blocked by any object

placed in front of LED source.

CONCLUSION

Thus, if Li-Fi technology can be put into practical use,

every bulb can be used as an alternative to Wi-Fi

hotspots. It provides simple, faster and efficient wireless

data communication. Li-Fi will make us to proceed

towards the cleaner, greener, safer and brighter future.

Thank You