Research Article
A Novel Optical Index Modulation Aided DCO-OFDM Scheme for VLC Systems
@INPROCEEDINGS{10.1007/978-3-319-90802-1_29, author={Haodong Li and Jian Sun and Wensheng Zhang and Cheng-Xiang Wang}, title={A Novel Optical Index Modulation Aided DCO-OFDM Scheme for VLC Systems}, proceedings={Wireless Internet. 10th International Conference, WiCON 2017, Tianjin, China, December 16-17, 2017, Proceedings}, proceedings_a={WICON}, year={2018}, month={5}, keywords={Visible light communication Optical index modulation DC-biased optical OFDM PAM}, doi={10.1007/978-3-319-90802-1_29} }- Haodong Li
Jian Sun
Wensheng Zhang
Cheng-Xiang Wang
Year: 2018
A Novel Optical Index Modulation Aided DCO-OFDM Scheme for VLC Systems
WICON
Springer
DOI: 10.1007/978-3-319-90802-1_29
Abstract
In this paper, a novel optical index modulation (OIM) aided direct-current (DC) biased optical OFDM (OIM-DCO-OFDM) scheme for visible light communication (VLC) systems is proposed. Different with traditional index modulation schemes, the proposed OIM-DCO-OFDM scheme uses index bits to determine which subcarrier transmit original signals and which subcarrier transmit conjugate signals. The constellation of traditional phase-shift keying (PSK) and quadrature amplitude modulation (QAM) is symmetrical about the real axis. It means that we cannot distinguish the original signals and conjugate signals. In order to recover index bits at the receiver, we propose a unipolar pulse amplitude modulation (PAM) scheme for the modulation of constellation bits, and design a zero-forcing (ZF) based detector. Compared with dual-mode index modulation aided DCO-OFDM (DM-DCO-OFDM) scheme, the proposed scheme has 1 dB and 2 dB performance gain at the bit error rate (BER) level of when the spectral efficiency is 1.21 bits/s/Hz and 2.18 bits/s/Hz, respectively. The proposed OIM-DCO-OFDM scheme can achieve 80% spectral efficiency improvement than the DM-DCO-OFDM scheme at the modulation order of .