NDLI: Wirelessly transmitting a grayscale image using visible light

Content Provider	IEEE Xplore Digital Library
Author	Parikh, H. Chokshi, J. Gala, N. Biradar, T.
Copyright Year	2013
Description	Author affiliation: Dept. of Electron. & Telecommun., Dwarkadas J.Sanghvi Coll. of Eng., Mumbai, India (Parikh, H.; Chokshi, J.; Gala, N.; Biradar, T.)
Abstract	We present the use of visible light as an alternative to wireless radio communication. We use common data encryption techniques followed by modulation of the signal using Orthogonal Frequency Division Multiplexing. The modulated signal is used to drive common Light Emitting Diodes which transmit a binary bit-stream in the form of light, through air as the medium. A photo detector, used at the receiver, along with a driver circuit and the appropriate decryption block is used to get back the original data. In this paper we show how a regular grayscale image can be transmitted with this method and faithful reproduction is achievable at the receiver. LED bulbs are used as transmitters and the intensity of the LEDs is varied at very high rate, using OFDM modulation technique to encode the image data, such that the intensity appears constant to the human eye. Thus, apart from providing illumination, the LED bulb transmits data at high rates. The sensitive receiver circuit is designed to detect these small instantaneous changes in the LED intensity and hence decode the received data, thereby reproducing the image in its original quality. The integration of high response Silicon PIN Photodiodes with signal processing tools makes this possible. Specific design measures prevent ambient light from interfering with the demodulation process at the receiver. Although this method can be currently used for short range, future developments can really expand its scope.
Sponsorship	IEEE Bombay Sect.
Starting Page	1
Ending Page	6
File Size	332774
Page Count	6
File Format	PDF
ISBN	9781467356183
e-ISBN	9781467356190
DOI	10.1109/ICAdTE.2013.6524748
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-23
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Very high speed data transfer PIN photodiodes OFDM Receivers Optical distortion Light emitting diodes PIN Photodiodes Visible Light communication Signal to noise ratio
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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