li-fi technology in wireless communication

LI-FI TECHNOLOGY IN WIRELESS COMMUNICATION

Vidya Vikas Institute of Engineering and Technology

A Seminar On:

Submitted by:Ananda Murthy D

Under the guidance of:Purushotham K P

Asst ProfDept of E&C

VVIET

CONTENTS Introduction Drawbacks Of Before Technologies Different Between The Technologies Working process Of Li-Fi Applications Merits/De-Merits Conclusion

INTRODUCTION One germen phycist. Harald

Haas has come up with a solution he calls

“data through illumination” D-Light taking the fiber out of fibber optic by sending data through an LED light bulb that varies in intensity faster than the human eye can follow.

HISTORY OF NETWORKSIn the olden days.

Wired networking.

Satellites Communications.

Wireless networking.

PRESENT TECHNOLOGY

1.4 Million 5 Billion

PRESENT TECHNOLOGY 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.

So what can carry this excess demand in the future .

1.4 Million base stations, 5 billion Mobile stations

600tb data every month

Availability

SecurityEfficiency

Capacity

ISSUES REGARDING RADIO SPECTRUM

WHO CAN REPLACES THE RADIO WAVES FORWIRELESS COMMUNICATION ?

LI-FI TECHNOLOGY

oLi-Fi means “Light Fidelity”. It is possible to encode data in the light by varying the rate at which the LEDs flicker ON and OFF to give different strings of 1’s and 0’s.

ARCHITECTURE OF LI-FI

LI-FI ENVIRONMENT

WORKING PROCESSLi-Fi offers an integrated light source that is straight forward to integrate into a projector. In this example LIFI consists of 5 primary sub-assemblies: Printed circuit board (PCB) RF power amplifier (PA) Bulb Optics Enclosure

HOW LI-FI WORKS ? operational procedure is very simple if the LED is ON, you transmit a digital 1’sif its OFF you transmit a 0’s. The LEDs can be switched ON and OFF very quickly, which gives nice opportunities for transmitting data.

DATA TRANSMISSIONS

DATA TRANSMISSIONS USING LI-FI

Giga shower GIGA MIMOFor giga-speed technologies, the Li-Fi Consortium defined GigaShower, GigaSpot and GigaMIMO models

DIFFERENT BETWEEN THE TECHNOLOGIES

APPLICATIONS ON OCEAN BEDS RF restricted Environments Hospitals(In few medical instruments Street lamps(as free access points) In Aircraft cabins

IN RF RESTRICTED ENVIRONMENTS

HOSPITALS(IN FEW MEDICAL INSTRUMENTS)

STREET LAMPS(AS FREE ACCESS POINTS)

IN AIRCRAFT CABINS

MERITS

High Security Easy To Use Fast Data Transfer Reliable Harmless ness Low Cost

DE-MERITS 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.

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.

REFRENCES[1]http://www.electronicsforu.com/electronicsfo ru/circuitarchives/view_article.asp?sno=778&title%20=%20LiFi%3A+A+New+Paradigm+in+Wireless+Communication&b_type=new&id=12042[2]. http://en.wikipedia.org/wiki/Li-Fi [3]. International Journal of advances in computing & communications, vol 1, 2013,page no-12 www.ijacc.org