Spatial and Time Dispersions Compensation With Double-Equalization for Optical Camera Communications

Abstract

In a mobile phone-based optical camera communication (OCC) system, the spatial and time dispersions, due to inter-pixel crosstalk and exposure time overlapping, deteriorate the transmission performance considerably. In this letter, a double-equalization method is studied and experimentally demonstrated in a rolling-shutter based OCC system, showing a record-high transmission data rate for a single white light-emitting diode (LED) system. Moreover, we further propose an improved technique to reduce the overhead of the signal extraction process while achieving similar performance. The effect of the normalization factor in the gamma correction processing is also investigated.