Optical Power Domain NOMA for Visible Light Communications

Lin, Bangjiang, Tang, Xuan and Ghassemlooy, Zabih (2019) Optical Power Domain NOMA for Visible Light Communications. IEEE Wireless Communications Letters, 8 (4). pp. 1260-1263. ISSN 2162-2337

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Official URL: https://doi.org/10.1109/LWC.2019.2913830

Abstract

We propose an optical power domain non-orthogonal multiple access (OPD-NOMA) scheme for visible light communications. OPD-NOMA superposes user messages in the optical power domain based on a light-emitting diode (LED) array. The maximum driven current for respective circuits is reduced compared to that of conventional NOMA, in which the LED-array-module is driven by a single circuit. OPD-NOMA reduces the gain and bandwidth requirements for the driver circuit of light source. The nonlinear power-current response of LED largely restricts its usable dynamic range and thus the transmit power. In OPD-NOMA, signals with lower powers suffer from reduced nonlinear distortion. The experimental results show that, OPD-NOMA offers improved transmission performance compared to conventional NOMA using the same driver circuit, since it can make a better use of the linear dynamic range of the LED’s power-current response.

Item Type: Article
Uncontrolled Keywords: Visible light communications (VLC), successive interference cancellation (SIC), non-orthogonal multiple access (NOMA)
Subjects: F300 Physics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 15 Jul 2019 09:44
Last Modified: 19 Nov 2019 10:16
URI: http://nrl.northumbria.ac.uk/id/eprint/40014

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