VISIBLE LIGHT COMMUNICATIONVISIBLE LIGHT COMMUNICATION

Department of Electronics and Communication Department of Electronics and Communication EngineeringEngineering

Presented byPresented by

B.VINOTHKUMARB.VINOTHKUMAR

vinobala55@gmail.comvinobala55@gmail.com

OUTLINEOUTLINE• AbstractAbstract

• IntroductionIntroduction

• MotivationMotivation

• VLC HistoryVLC History

• Block diagramBlock diagram

• Reasons for using this communicationReasons for using this communication

• Communication using Image SensorsCommunication using Image Sensors

• Example of three dimensional position measuring sys..Example of three dimensional position measuring sys..

• Future projects in wireless broadbandFuture projects in wireless broadband

• Advantages & disadvantagesAdvantages & disadvantages

• ConclusionsConclusions

ABSTRACTABSTRACT

• The wireless data transmission and wired data transmission has The wireless data transmission and wired data transmission has been outdated. People always want to renovate stuffs. This been outdated. People always want to renovate stuffs. This curiosity has led to visible light communication system. This curiosity has led to visible light communication system. This technique of data transmission has proved that the electronic lights technique of data transmission has proved that the electronic lights can not only be used for decorative purpose but also for can not only be used for decorative purpose but also for communication purpose. This technique has made use of the communication purpose. This technique has made use of the harmless visible radiation around us for data transmission. Thus harmless visible radiation around us for data transmission. Thus we can’t ignore this method spelling that it’s not a green way, this 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 is a green way of communication which won’t affect humans and other birds and animals in the environment. Hope the colorful other birds and animals in the environment. Hope the colorful lights have given us a colorful way of data transmission. Now let’s lights have given us a colorful way of data transmission. Now let’s get some more information about this colorful method of data get some more information about this colorful method of data transmission.transmission.

INTRODUCTIONINTRODUCTION

MOTIVATIONMOTIVATION

1900s Current405 B.C. 1800s280 B.C. 1880~

FireFire

SunlightSunlight

LampLamp

LEDLED

Heliograph

BeaconFire

PharosLighthouse

Ship-to-shipComm.

PhotophoneBy Bell

Traff ic Light/Signboard Light

800 B.C.

Burning KiteIn Batt le

VLCVLC

BLOCK DIAGRAMBLOCK DIAGRAM

Basic diagram Basic diagram Technology & Modulation Technology & Modulation

REASONS FOR USING THIS COMMUNICATIONREASONS FOR USING THIS COMMUNICATION

• The visible light regulation is not regulated.The visible light regulation is not regulated.

• Visible light LED will be used everywhere.Visible light LED will be used everywhere.

• Image sensors can be used as receiversImage sensors can be used as receivers

COMMUNICATION USING IMAGE COMMUNICATION USING IMAGE SENSORSSENSORS

• Even if multiple visible light Even if multiple visible light sources send data simultaneously, sources send data simultaneously, an image sensor is able to receive an image sensor is able to receive and demodulate all the data and demodulate all the data simultaneously without any simultaneously without any interference between them. interference between them. Camera receiver) continuously Camera receiver) continuously takes images of a scene with an takes images of a scene with an LED light and a receiver detects LED light and a receiver detects the optical intensity at a pixel the optical intensity at a pixel where the LED light is focused where the LED light is focused on.on.

EXAMPLE OF THREE DIMENSIONAL POSITION EXAMPLE OF THREE DIMENSIONAL POSITION MEASURING SYSTEMMEASURING SYSTEM

• The technology is applied to The technology is applied to measure the displacement which measure the displacement which is caused by the increase of is caused by the increase of temperature of the aluminum temperature of the aluminum dome roof due to the sunshine in dome roof due to the sunshine in the daytime. 12 LED lightings the daytime. 12 LED lightings were attached to the roof. We were attached to the roof. We were able to do automatic were able to do automatic measurement of every 20 minutes measurement of every 20 minutes for 24 hours and confirm the for 24 hours and confirm the displacement of several displacement of several millimetersmillimeters

EXAMPLE OF THREE DIMENSIONAL POSITION EXAMPLE OF THREE DIMENSIONAL POSITION MEASURING SYSTEMMEASURING SYSTEM

• Consider a parallel visible Consider a parallel visible light communication system light communication system using an LED array as a using an LED array as a transmitter and high-speed transmitter and high-speed camera on a vehicle as a camera on a vehicle as a receiverreceiver

ADVANTAGES & DISADVANTAGESADVANTAGES & DISADVANTAGES

CONCLUSIONSCONCLUSIONS

REFERENCEREFERENCE

•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.

Any Questions?Any Questions?

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