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

TL;DR

This paper introduces a non-orthogonal multi-band CAP scheme for visible light communication that significantly improves spectral efficiency by up to 44% without increasing complexity.

Contribution

It presents a novel non-orthogonal multi-band CAP scheme that enhances spectral efficiency in VLC systems without added complexity.

Findings

Achieves up to 30% bandwidth saving

Realizes 44% improvement in spectral efficiency

No additional computational complexity introduced

Abstract

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.