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http://dx.doi.org/10.5369/JSST.2013.22.6.421

Synchronous Visible Light Communication Systems Using 3-Level LED Modulation  

Lee, Seong-Ho (Department of Electronic & IT Media Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of Sensor Science and Technology / v.22, no.6, 2013 , pp. 421-427 More about this Journal
Abstract
In this paper, we introduce a new synchronous visible light communication system in which the synchronizing pulse and the data bits are simultaneously transmitted using a 3-level light signal. In the transmitter, the synchronizing pulse and the data bits modulate independently two identical visible LEDs, whose output lights add in free space, make 3-level optical signal. In the receiver, a photodiode detects the light and generates a 3-level output voltage, whose positive and negative part correspond to the synchronizing pulse and the data bits, respectively. The two signals are easily separated and recovered by a simple diode circuit. This configuration provides two independent VLC channels without any multiplexing technique, simplifies the circuit design and construction of synchronous VLC systems.
Keywords
Visible light communication; LED; Synchronizing pulse; 3-level modulation; Synchronous VLC;
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Times Cited By KSCI : 1  (Citation Analysis)
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