Open AccessDFT-spread OFDM with quadrature index modulation for practical VLC systems
Author(s) -
Faheem Ahmed,
Yungui Nie,
Chen Chen,
Min Liu,
Pengfei Du,
Arokiaswami Alphones
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.441650
Subject(s) - orthogonal frequency division multiplexing , subcarrier , visible light communication , modulation (music) , quadrature (astronomy) , electronic engineering , quadrature amplitude modulation , computer science , optics , bit error rate , telecommunications , physics , engineering , light emitting diode , decoding methods , acoustics , channel (broadcasting)
In this paper, we for the first time propose and investigate a novel discrete Fourier transform-spread-orthogonal frequency division multiplexing with quadrature index modulation (DFT-S-OFDM-QIM) scheme for practical visible light communication (VLC) systems. By performing subcarrier index modulation on both the in-phase and quadrature components of each subcarrier, OFDM-QIM achieves a higher spectral efficiency than conventional OFDM with index modulation (OFDM-IM). Moreover, the peak-to-average power ratio (PAPR) of OFDM-QIM can be substantially reduced by applying DFT spreading, and hence DFT-S-OFDM-QIM exhibits high tolerance against light-emitting diode (LED) nonlinearity. The superiority of the proposed DFT-S-OFDM-QIM scheme over other benchmark schemes has been successfully verified by both simulation and experimental results.