TY - JOUR

T1 - OFDM-PWM scheme for visible light communications

AU - Zhang, T.

AU - Ghassemlooy, Z.

AU - Rajbhandari, Sujan

AU - Popoola, W. O.

AU - Guo, S.

N1 - NOTICE: this is the author’s version of a work that was accepted for publication in Optics Communications. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Optics Communications, [385 (2016)] DOI: 10.1016/j.optcom.2016.10.038 © 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2016/11/4

Y1 - 2016/11/4

N2 - In this paper, we propose an improved hybrid optical orthogonal frequency division multiplexing (O-OFDM) and pulse-width modulation (PWM) scheme for visible light communications. In this scheme, a bipolar O-OFDM signal is converted into a PWM format where the leading and trailing edges convey the frame synchronization and modulated information, respectively. The proposed scheme is insensitive to the non-linearity of the light emitting diode (LED) as LEDs are switched ‘on’ and ‘off’ between two points. Therefore, the tight requirement on the high peak-to-average-power-ratio (PAPR) in O-OFDM is no longer a major issue. The simulation and experimental results demonstrate that the proposed scheme offers an improved bit error rate performance compared to the traditional asymmetrically clipped O-OFDM (ACO-OFDM).

AB - In this paper, we propose an improved hybrid optical orthogonal frequency division multiplexing (O-OFDM) and pulse-width modulation (PWM) scheme for visible light communications. In this scheme, a bipolar O-OFDM signal is converted into a PWM format where the leading and trailing edges convey the frame synchronization and modulated information, respectively. The proposed scheme is insensitive to the non-linearity of the light emitting diode (LED) as LEDs are switched ‘on’ and ‘off’ between two points. Therefore, the tight requirement on the high peak-to-average-power-ratio (PAPR) in O-OFDM is no longer a major issue. The simulation and experimental results demonstrate that the proposed scheme offers an improved bit error rate performance compared to the traditional asymmetrically clipped O-OFDM (ACO-OFDM).

KW - Visible light communications

KW - Pulse-width modulation

KW - Optical orthogonal frequency division multiplexing

KW - Peak-to-average-power-ratio

U2 - 10.1016/j.optcom.2016.10.038

DO - 10.1016/j.optcom.2016.10.038

M3 - Article

VL - 385

SP - 213

EP - 218

JO - Optics Communications

JF - Optics Communications

SN - 0030-4018

ER -