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http://dx.doi.org/10.7471/ikeee.2019.23.2.571

LED Dimming Control Using Manchester-Code Duty Factor And Spike Detection in Visible Light Communication  

Lee, Seong-Ho (Dept. of Electronics and IT Media Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of IKEEE / v.23, no.2, 2019 , pp. 571-579 More about this Journal
Abstract
Visible light communication (VLC) performs illumination and communication simultaneously, thus it is important to prevent the flicker due to the optical power variation during data transmission and at the same time to have dimming control capability. In this paper, we used Manchester code for flicker-prevention and dimming control. In the transmitter, the duty factor of the Manchester code was used for controlling the LED illumination. In the receiver, the edge-spike signals of an RC-high pass filter were used for recovering the Manchester code while preventing the adjacent noise light. In experiments, the LED light was kept flicker-free and the average optical power was controlled in the range of 8~68 % of the continuous wave (CW) LED light by changing the duty factor of the Manchester code.
Keywords
Visible light communication; LED; Manchester code; Edge-spike; Flicker-free; Dimming control;
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