Title: Visible Light Communication Using Receivers of Camera Image Sensor and Solar Cell
Authors: Liu, Yang
Chen, Hung-Yu
Liang, Kevin
Hsu, Chin-Wei
Chow, Chi-Wai
Yeh, Chien-Hung
Department of Photonics
Keywords: Free space communication;optical communications;light-emitting diode (LED)
Issue Date: 1-Feb-2016
Abstract: We propose an electronic label and sensor system using visible light communication (VLC). The downlink signal is transmitted by a white-light light-emitting diode (LED) lamp that can provide lighting, VLC, and energy harvesting for mobile devices. The downlink is received by a solar cell. The uplink can be captured by a surveillance camera image sensor. However, using the camera image sensor as a VLC receiver (Rx) is challenging since the data rate is limited by the frame rate and due to uneven light exposure. The rolling shutter effect of the image sensor can be used to increase the data rate. In this paper, we propose and demonstrate how to demodulate the obtained rolling shutter pattern using a second-order polynomial (SOP) extinction ratio (ER) enhancement scheme, together with iterative and modified quick adaptive thresholding schemes. The ER enhancement scheme can significantly reduce the large ER fluctuation. Experimental results show that by using the proposed SOP ER enhancement scheme, the bit error rate (BER) improvement can be up to two orders of magnitude. We also believe that the proposed electronic label and sensor system may be applicable to Internet-of-Things sensing networks for connecting a number of mobile devices.
URI: http://dx.doi.org/10.1109/JPHOT.2015.2507364
ISSN: 1943-0655
DOI: 10.1109/JPHOT.2015.2507364
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