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A SIMO Hybrid Visible-Light Communication System for Optical IoT

Abstract:

Visible-light communication (VLC) is an emerging technology utilizing light-emitting diodes and photodetectors (PDs) and cameras [i.e., image sensors (ISs)] as the transmitter and receivers (Rx), respectively, for simultaneous data communications, illumination, localization, and sensing in the indoor optical Internet of Things. We propose a single-input-multiple-output (SIMO) hybrid VLC system using PD-based and IS-based Rxs for simultaneous high-speed and low-speed (i.e., R_{b-{\mathrm{ High}}} and R_{b-{\mathrm{ Low}}} ) data transmission. In addition, we propose amplitude overlapping {A} {\mathrm{ OL}} in the modulation format to increase R_{b} and reduce the attenuation due to the high-pass filter effect of the bias-T. We experimentally evaluate the performance of the proposed scheme considering the interlink impacts. Results show that at {A} {\mathrm{ OL}} of 0-0.2: 1) the measured bit error rate for the PD-based VLC is below the forward error correction limit of 3.8 \times 10 {-3} for R_{b-{\mathrm{ Low}}} of 2.5 and 5 kb/s at R_{b-{\mathrm{ High}}} of 35 and 60 Mb/s, respectively, and 2) for the IS-based VLC link with the camera gain of 4 dB and R_{b-{\mathrm{ High}}} of up to 70 Mb/s, the reception success rates are >96 and 90% at R_{b-{\mathrm{ Low}}} of 2.5 and 5 kb/s, respectively.