Asymmetrical hybrid optical OFDM for visible light communications with dimming control
Asymmetrical hybrid optical OFDM for visible light communications with dimming control
This letter proposes an asymmetrical hybrid optical orthogonal frequency division multiplexing (AHO-OFDM) scheme for dimmable visible light communication systems. In the proposed scheme, either asymmetrically clipped optical OFDM (ACO-OFDM) or pulse-amplitude-modulated discrete multitone (PAM-DMT) signal is inverted and then both the signals are combined for transmission, where pulsewidth modulation is no longer required for dimming control. The power of ACO-OFDM and PAM-DMT signals is adjusted so that the amplitude of the combined AHO-OFDM signal is asymmetrical, which could utilize all the available subcarriers as well as the entire dynamic range of light-emitting diodes with various dimming levels. Simulation results show that the proposed scheme could achieve a wide dimming range with a small throughput fluctuation.
974-977
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
1 May 2015
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Wang, Qi, Wang, Zhaocheng and Dai, Linglong
(2015)
Asymmetrical hybrid optical OFDM for visible light communications with dimming control.
IEEE Photonics Technology Letters, 27 (9), .
(doi:10.1109/LPT.2015.2404972).
Abstract
This letter proposes an asymmetrical hybrid optical orthogonal frequency division multiplexing (AHO-OFDM) scheme for dimmable visible light communication systems. In the proposed scheme, either asymmetrically clipped optical OFDM (ACO-OFDM) or pulse-amplitude-modulated discrete multitone (PAM-DMT) signal is inverted and then both the signals are combined for transmission, where pulsewidth modulation is no longer required for dimming control. The power of ACO-OFDM and PAM-DMT signals is adjusted so that the amplitude of the combined AHO-OFDM signal is asymmetrical, which could utilize all the available subcarriers as well as the entire dynamic range of light-emitting diodes with various dimming levels. Simulation results show that the proposed scheme could achieve a wide dimming range with a small throughput fluctuation.
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More information
Accepted/In Press date: 16 February 2015
e-pub ahead of print date: 20 February 2015
Published date: 1 May 2015
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 400623
URI: http://eprints.soton.ac.uk/id/eprint/400623
ISSN: 1041-1135
PURE UUID: 973af4df-fb48-4398-b9c1-92fa6888981f
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Date deposited: 19 Sep 2016 15:42
Last modified: 15 Mar 2024 02:23
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Author:
Qi Wang
Author:
Zhaocheng Wang
Author:
Linglong Dai
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