400 m rolling-shutter-based optical camera communications link
Elizabeth Eso, Shivani Rajendra Teli, Navid Bani Hassan, S. Vítek, Zabih Ghassemlooy, Stanislav Zvánovec
Abstract
In this Letter, we develop a novel technique, to the best of our knowledge, to increase the link span ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi>L</mml:mi> <mml:mi>s</mml:mi> </mml:msub> </mml:mrow> </mml:math> ) of a rolling shutter (RS)-based optical camera communications (OCC) system by reducing the spatial bandwidth of the camera in the out-of-focus regions. We demonstrate a 400 m line-of-sight RS-based OCC link, which is to date the longest <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi>L</mml:mi> <mml:mi>s</mml:mi> </mml:msub> </mml:mrow> </mml:math> reported in these systems, and develop a detection method to extract the information out of the video frames, successfully. The proposed system relaxes the condition of a large surface area for the transmitter light source. Consequently, we show that at 400 m <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi>L</mml:mi> <mml:mi>s</mml:mi> </mml:msub> </mml:mrow> </mml:math> and exposure times of 100–80 µs, a data rate of 450 bps is achieved successfully.