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Multilevel Modulation by LED Luminance Distribution for Optical Camera Communication

Multilevel modulation by LED luminance distribution is proposed and experimentally verified to increase signal-to-interference-plus-noise-ratio (SINR) for optical camera communication (OCC). LED luminance level is measured by number of white pixels on the LED image and calibrated. Error-free transmission of 64 quadrature amplitude modulation (QAM) is experimentally demonstrated up to a distance of 2.0 meter using 30-frame-per-second (fps) image sensor.