238 Kbits/frame WDM transmission over a CVLC system with sampling reconstruction for SFO mitigation

The camera-based visible light communication (CVLC) exploiting rolling shutter effect (RSE) is a cost-efficient technique that ensures secured data transmission. By controlling the on-off state of the light emitting diode (LED), data can be modulated onto the emitting visible light. The corresponding data recovery can be realized by exploiting the RSE of the mobile-phone camera. In this paper, based on a commercial RGB-LED and a single mobile-phone camera, a wavelength division-multiplexing (WDM) CVLC system exploiting RSE is experimentally demonstrated. For the generation and reception of the WDM signals, a structure of three parallel-independent channels is applied to the system. To mitigate the sampling frequency offset (SFO) effect, a low-complexity sampling reconstruction (SR) scheme is proposed and used in each channel of the system. Experimental results show that with the help of the proposed SR scheme, the system can achieve a theoretical data rate up to 2.38 Kbits/frame, with the bit error rate (BER) lower than 3.8 × 10-3.