# Experimental Demonstration of Staggered CAP Modulation for Low Bandwidth Red-Emitting Polymer-LED based Visible Light Communications

## TL;DR

This paper experimentally demonstrates staggered CAP modulation in polymer LED visible light communication, achieving higher data rates than traditional methods by fully utilizing the spectrum.

## Contribution

First experimental demonstration of staggered CAP modulation in polymer LED VLC systems, showing significant data rate improvements over conventional methods.

## Key findings

- Achieved un-coded transmission speed of ~6 Mb/s.
- Staggered CAP outperforms 4-band CAP and OOK in data rate.
- Full spectrum utilization enhances VLC performance.

## Abstract

In this paper we experimentally demonstrate, for the first time, staggered carrier-less amplitude and phase (sCAP) modulation for visible light communication systems based on polymer light-emitting diodes emitting at ~639 nm. The key advantage offered by sCAP in comparison to conventional multiband CAP is its full use of the available spectrum. In this work, we compare sCAP, which utilises four orthogonal filters to generate the signal, with a conventional 4-band multi-CAP system and on-off keying (OOK). We transmit each modulation format with equal energy and present a record un-coded transmission speed of ~6 Mb/s. This represents gains of 25% and 65% over the achievable rate using 4-CAP and OOK, respectively.