In this work we propose and experimentally demonstrate a novel non-orthogonal
multi-band carrier-less amplitude and phase (NM-CAP) scheme for bandlimited
visible light communication systems in order to increase the spectral
efficiency. We show that a bandwidth saving up to 30% can be achieved thus
resulting in 44% improvement in the measured spectral efficiency with no
further bit error rate performance degradation compared to the traditional
m-CAP scheme. We also show that higher order systems can provide higher
bandwidth compression than low order systems. Furthermore, with no additional
functional blocks at the transmitter or the receiver the proposed scheme
introduces no extra computational complexity.Comment: 6 pages, 5 figure