Experimental Demonstration of Dual Camera Receivers in M-PAM Rolling Shutter Based Visible Light Communication

This study demonstrates the communication performance of rolling shutter based visible light communication (RS-VLC) using dual camera receivers. In RS-VLC, the modulated signals emitted from the light source are captured as stripes based on the exposure timing difference for each line. Using this sequential exposure mechanism, a data rate higher than the frame rate can be achieved. To achieve higher data rates, we apply M-ary pulse amplitude modulation (M-PAM) to RS-VLC. The challenges for M-PAM in RS-VLC include limitations in the available grayscale range and non-uniform luminance distribution, both of which cause symbol errors. To solve this problem, we use two images in which the light emitting diodes (LEDs) are captured at different positions obtained by dual rolling shutter cameras. In this paper, we propose a method to combine two received signals, demodulate the signal transmitted by M-PAM in RS-VLC, and experimentally confirm the improvement in the symbol error rate (SER).