Li-Fi Technology

Meghnad Saha Institute of Technology

A SEMINAR ON

LIFIA future technology in wireless communications


PRESENTED BY THE FOLLOWING 3RD YEAR ECE STUDENTS

1. Sarmishtha Basak2. Kaushik Chakrabarti 3. Chandradeep Chakravarti4. Joshita Ghatak


UNDER THE GUIDANCE OF

Prof. Oindri Ray, Department of ECE


CONTENTS

1.INTRODUCTION2.HISTORY 3.ISSUE REGARDING RADIO SPECTRUM4.WORKING PROCESS5.FEATURES6.APPLICATIONS7.ADVANTAGES8.DISADVANTAGES9.CONCLUSION


LI -FI

Light Fidelity Transmission of data through illumination.


Li-Fi Carrier is light Transceiver-fitted

LED lamps are used

BASIC DIFFERENCE FROM WIFI

Wi-Fi Carrier is Radio

wave Wi-Fi modems are

used


Inventor of Li-Fi

HISTORY

Harald Hass


12th July 2011: He used a table lamp with an LED

TED Global: Haas demonstrated a data rate of transmission of around 10Mbps.

2011: He achieved 800Mbps.

RESEARCH OF PROF. HASS

SO A PROVEN TECHNOLOGY


Availability

Capacity

Efficiency

Security

Issues with Radio Spectrum


Why OnlyVisible Light

Communication

ONLY LEFT IS THE VISIBLE - LIGHT SPECTRUM

WAVES USABLE WHY

GAMA RAYS Radioactive and dangerous for health

X-RAYS Similar health issues

UV RAYS Harmful for skin and can’t be use for long duration

INFRARED WAVE Eye safety regulations and only be used in low power

Radio waves Expensive, energy consuming



Light based Wi-FiThus Every light source is a HubLED on= 1LED off= 0Operating speed of LED <1 μs

BASIC CONCEPTS


MECHANISM



LIFI HAS THE UPPERHAND DUE TO PARALLAL DATA TRANSMISSION


Giga Shower

WORKING MODELS

Giga MIMO


Primary sub-assemblies:• Bulb• RF power amplifier circuit (PA)• Printed circuit board (PCB)• Enclosure

CONSTRUCTION


IMPLEMENTATION


LI-FI vs. WI-FI

S. No.

Parameter Li-fi Wi-fi

1 SPEED > 1 GB/S around 150 Mb/s

2 Medium of data transfer

Use light as carrier

Use radio spectrum

3 Spectrum range Visible light has 10000 times more

Having less spectrum range than VLC

4 Cost Cheaper Expensive

5 Network topology Point to point Point to point

6 Operating frequency

Hundreds of Tera Hz

2.4 GHz


COMPARISON WITH OTHER TECHNOLOGIES


POTENTIAL APPLICATIONS


DAILY LIFE WITH LI-FI




IN RF RESTRICTED ENVIRONMENTS



IN AIRCRAFT CABINS



USE IN OPERATION THEATER


TRAFFIC CONTROL



STREET LAMPS AS FREE ACESS POINTS



1.Availability2.Efficiency3.High Security4.Easy to Use 5.Fast data transfer 6.Harmless7.Low cost

ADVANTAGES


1. PRESENCE OF LIGHT IS ESSENTIAL2. WORKS BETTER IN LED BUT VERY LOW EFFICIENCY WITH BULBS4. VISIBLE LIGHT CAN’T PENETRATE THROUGH SOLID OBJECTS

LIMITATIONS


CONCLUSION
