Abstract
A real-time visible light communication (VLC) system is proposed and experimentally demonstrated for simultaneous high-speed wireless communication and positioning beacon transmission realization. Through proposed 2 amplitude shift keying-constant envelope-orthogonal frequency division multiplexing (2ASK-CE-OFDM) coding, the transmitter can integrate 2ASK positioning beacon signal onto the envelope of CE-OFDM communication signal. The communication and positioning signals can be demodulated at the receiver, respectively. The mathematical derivations of 2ASK-CE-OFDM and implementation details of the field programmable gate array (FPGA) based real-time VLC system are introduced in this paper. The real-time VLC system transmission performance is verified with different light radial distances. Compared with directly modulating the 2ASK signal ontothe envelope of OFDM, our proposed system has a better performance in terms of the light radial distance. The experimental result shows that the bit error rates (BERs) of 2ASK based positioning beacon and CE-OFDM based communication signal transmission are 4.3×10−7 and 6.8×10−4 when the wireless radial distance is 3.5 m.
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