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In this paper, we have experimentally demonstrated the feasibility of a LMS-Volterra based joint MIMO equalizer in multiband super-Nyquist carrierless amplitude phase modulation visible light communication system. To obtain higher spectrum efficiency, overlapping between different sub-bands is introduced in this experiment. By using joint MIMO equalizer, an aggregate data rate of 1.26 Gb/s is successfully achieved in 1-m indoor free space transmission with the BER below the 7% FEC limit of 3.8 × 10. To our best knowledge, this is the first time that our proposed joint MIMO equalizer is used to equalize multiband super-Nyquist data in VLC system.

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This paper first brings a single receiver multiple-input-multiple-output (SR-MIMO) model to realize the space multiplexing in the visible light communication (VLC) system. The signals from two transmitters are super-imposed in the receiver thus to realize a specially superposed modulation. Depending on the power ratio between two transmitters, various superposed signal structures can be obtained. In order to separate the superposed signal, we design a novel detection algorithm which consists of the successive interference cancellation (SIC) and the look-up table (LUT). Extensive experiments demonstrate that a data rate of 1.5Gbit/s is achieved in the 1.3-m indoor line-of-sight (LOS) scenario with the bit error rates (BERs) are below the forward error correction (FEC) threshold.