A MISO-VLC System Based on LACO-OFDM and Superposed Constellation Demodulation

Despite asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) has the advantages of anti-multipath fading and high optical power efficiency, its spectral efficiency is half of direct-current-offset optical OFDM (DCO-OFDM). In order to improve the spectral efficiency of ACO-OFDM, a layered ACO-OFDM (LACO-OFDM) technique is first introduced in our system. Then, we use two-transmitter and one-receiver to build a multiple-input single-output (MISO) visible light communication (VLC) system based on the LACO-OFDM and superposed constellation demodulation. Extensive simulation results show that the proposed LACO-OFDM-based MISO-VLC system can improve the spectral efficiency and data capacity without the additional bandwidth requirement, thus demonstrating its application potential.