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MIMO Techniques for Carrierless Amplitude and Phase Modulation in Visible Light Communication

In this letter, multiple-input multiple-output (MIMO) techniques are proposed to improve the spectral efficiency and bit error rate (BER) performance of the conventional carrierless amplitude and phase modulation (CAP) in visible light communication. Analytic frameworks for both multiplexing and diversity MIMO techniques are developed for CAP. The analytical expressions in line-of-sight (LOS) propagation are validated via simulation. A precoding technique is further applied to improve the power efficiency of the multiplexing scheme resulting in a signal-to-noise ratio (SNR) gain of 28.5 dB.