Toeplitz concatenated matrix aided ICA algorithm for super-Nyquist multiband CAP VLC systems

Zhe Wang; Guoqiang Li; Fangchen Hu; Nan Chi

doi:10.1364/OE.404925

Toeplitz concatenated matrix aided ICA algorithm for super-Nyquist multiband CAP VLC systems

Opt Express. 2020 Sep 28;28(20):29876-29894. doi: 10.1364/OE.404925.

Authors

Zhe Wang, Guoqiang Li, Fangchen Hu, Nan Chi

PMID: 33114877
DOI: 10.1364/OE.404925

Abstract

In this paper, we demonstrate a Toeplitz concatenated matrix aided independent component analysis (TCM-ICA) equalizer that can skillfully compensate for the inter-channel interference (ICI) of super-Nyquist multiband carrierless amplitude and phase modulation (m-CAP) system. In the point-to-point super-Nyquist m-CAP visible light communication (VLC) scenario, we experimentally demonstrated a system-level average spectral efficiency (SE) enhancement of 0.50 b/s/Hz in comparison to the conventional scheme. In the multiple-input single-output (MISO) super-Nyquist 5-CAP scenario, the subcarrier-level Q factor enhancements of 4.4 dB, 5.2 dB, and 6.5 dB are achieved in comparison with the least-mean-square (LMS) post-equalizer for the 2^nd, 3^rd and 4^th subcarrier, respectively. As far as we know, the TCM-ICA equalizer is the most effective ICI compensation scheme to enhance SE in the super-Nyquist m-CAP systems.