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In this work we propose and experimentally demonstrate a novel non-orthogonalmulti-band carrier-less amplitude and phase (NM-CAP) scheme for bandlimitedvisible light communication systems in order to increase the spectralefficiency. We show that a bandwidth saving up to 30% can be achieved thusresulting in 44% improvement in the measured spectral efficiency with nofurther bit error rate performance degradation compared to the traditionalm-CAP scheme. We also show that higher order systems can provide higherbandwidth compression than low order systems. Furthermore, with no additionalfunctional blocks at the transmitter or the receiver the proposed schemeintroduces no extra computational complexity.

Non-Orthogonal Multi-band CAP for Highly Spectrally Efficient VLC Systems