Novel Flicker-Free Optical Camera Communications Based on Compressed Sensing

One of the major challenges of optical camera communication (CamCom) is the low sampling rate at the camera-based receiver side compared with the very high speed modulation of the LED lighting source. The recently emerging compressed sensing (CS) theory makes signal reconstruction at a low sampling rate possible if the signal has a sparse representation. This letter proposes a novel flicker-free CS-based optical CamCom scheme that can detect signals at a lower sampling rate than the Nyquist rate, while providing reliable signal detection and implementation flexibility. This can be achieved by designing the random projection structure based on pseudonoise codes at the transmitter, leading to a decrease in complexity on the camera-based receiver side. The numerical results show that the proposed scheme can detect the original signal with high probability at a much lower sampling rate than the Nyquist rate.