2. OUTLINE
• Abstract
• Introduction
• Motivation
• VLC History
• Block diagram
• Reasons for using this communication
• Communication using Image Sensors
• Example of three dimensional position measuring sys..
• Future projects in wireless broadband
• Advantages & disadvantages
• Conclusions
3. ABSTRACT
• The wireless data transmission and wired data transmission has
been outdated. People always want to renovate stuffs. This
curiosity has led to visible light communication system. This
technique of data transmission has proved that the electronic lights
can not only be used for decorative purpose but also for
communication purpose. This technique has made use of the
harmless visible radiation around us for data transmission. Thus
we can’t ignore this method spelling that it’s not a green way, this
is a green way of communication which won’t affect humans and
other birds and animals in the environment. Hope the colorful
lights have given us a colorful way of data transmission. Now let’s
get some more information about this colorful method of data
transmission.
6. ~ 800 B.C.
405 B.C. 280 B.C. 1800s 1880 1900s Current
Photophone
Sunlight
Sunlight Heliograph
By Bell
Fire Beacon Pharos Burning Kite
Fire
Fire Lighthouse In Battle
Ship-to-ship Traffic Light
Lamp
Lamp Comm. /Signboard Light
LED
LED VLC
VLC
8. REASONS FOR USING THIS COMMUNICATION
• The visible light regulation is not regulated.
• Visible light LED will be used everywhere.
• Image sensors can be used as receivers
9. COMMUNICATION USING IMAGE
SENSORS
• Even if multiple visible light
sources send data simultaneously,
an image sensor is able to receive
and demodulate all the data
simultaneously without any
interference between them.
Camera receiver) continuously
takes images of a scene with an
LED light and a receiver detects
the optical intensity at a pixel
where the LED light is focused
on.
10. EXAMPLE OF THREE DIMENSIONAL POSITION
MEASURING SYSTEM
• The technology is applied to
measure the displacement which
is caused by the increase of
temperature of the aluminum
dome roof due to the sunshine in
the daytime. 12 LED lightings
were attached to the roof. We
were able to do automatic
measurement of every 20 minutes
for 24 hours and confirm the
displacement of several
millimeters
11. EXAMPLE OF THREE DIMENSIONAL POSITION
MEASURING SYSTEM
• Consider a parallel visible
light communication system
using an LED array as a
transmitter and high-speed
camera on a vehicle as a
receiver
14. REFERENCE
•Afgani, M., Haas, H., Elgala, H., and Knipp, D. 2006. Visible light
communication usingOFDM. In 2nd International Conference on Testbeds
and Research Infrastructures for theDevelopment of Networks and
Communities, 2006. TRIDENTCOM 2006
.
•Amirshahi, P. and Kavehrad, M. 2006. Broadband access over medium and
low voltage power-lines and use of white light emitting diodes for indoor
communications. In IEEE ConsumerCommunications & Networking
Conference, Las Vegas, Nevada.
•Citeseer.Crown, A. 1974. Tidings and Instructions: How News Travelled in
the Ancient Near East. Journalof the Economic and Social History of the
Orient/Journal de l'histoireeconomiqueetsocialede l'Orient 17, 3, 244{271.
