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Layered ACO-OFDM for intensity-modulated direct-detection optical wireless transmission

Layered ACO-OFDM for intensity-modulated direct-detection optical wireless transmission
Layered ACO-OFDM for intensity-modulated direct-detection optical wireless transmission
Layered asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) with high spectral efficiency is proposed in this paper for optical wireless transmission employing intensity modulation with direct detection. In contrast to the conventional ACO-OFDM, which only utilizes odd subcarriers for modulation, leading to an obvious spectral efficiency loss, in layered ACO-OFDM, the subcarriers are divided into different layers and modulated by different kinds of ACO-OFDM, which are combined for simultaneous transmission. In this way, more subcarriers are used for data transmission and the spectral efficiency is improved. An iterative receiver is also proposed for layered ACO-OFDM, where the negative clipping distortion of each layer is subtracted once it is detected so that the signals from different layers can be recovered. Theoretical analysis shows that the proposed scheme can improve the spectral efficiency by up to 2 times compared with conventional ACO-OFDM approaches with the same modulation order. Meanwhile, simulation results confirm a considerable signal-to-noise ratio gain over ACO-OFDM at the same spectral efficiency.
1094-4087
12382-12393
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Qian, Chen
2b85263f-c5ae-413e-a0d3-4c3abd84ff61
Guo, Xuhan
faf826df-cfe9-4217-9773-14ea36fc67c3
Wang, Zhaocheng
a6bc4037-d26d-4ddd-9ce5-f018980115b6
Cunningham, David G.
ea57d63f-7f68-44c5-b297-d6df7701a972
White, Ian H.
b991b9d8-d30f-43ff-8475-14e4b6dfb5e5
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Qian, Chen
2b85263f-c5ae-413e-a0d3-4c3abd84ff61
Guo, Xuhan
faf826df-cfe9-4217-9773-14ea36fc67c3
Wang, Zhaocheng
a6bc4037-d26d-4ddd-9ce5-f018980115b6
Cunningham, David G.
ea57d63f-7f68-44c5-b297-d6df7701a972
White, Ian H.
b991b9d8-d30f-43ff-8475-14e4b6dfb5e5

Wang, Qi, Qian, Chen, Guo, Xuhan, Wang, Zhaocheng, Cunningham, David G. and White, Ian H. (2015) Layered ACO-OFDM for intensity-modulated direct-detection optical wireless transmission. Optics Express, 23 (9), 12382-12393. (doi:10.1364/OE.23.012382).

Record type: Article

Abstract

Layered asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) with high spectral efficiency is proposed in this paper for optical wireless transmission employing intensity modulation with direct detection. In contrast to the conventional ACO-OFDM, which only utilizes odd subcarriers for modulation, leading to an obvious spectral efficiency loss, in layered ACO-OFDM, the subcarriers are divided into different layers and modulated by different kinds of ACO-OFDM, which are combined for simultaneous transmission. In this way, more subcarriers are used for data transmission and the spectral efficiency is improved. An iterative receiver is also proposed for layered ACO-OFDM, where the negative clipping distortion of each layer is subtracted once it is detected so that the signals from different layers can be recovered. Theoretical analysis shows that the proposed scheme can improve the spectral efficiency by up to 2 times compared with conventional ACO-OFDM approaches with the same modulation order. Meanwhile, simulation results confirm a considerable signal-to-noise ratio gain over ACO-OFDM at the same spectral efficiency.

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Accepted/In Press date: 29 April 2015
e-pub ahead of print date: 1 May 2015
Published date: 4 May 2015
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 400622
URI: https://eprints.soton.ac.uk/id/eprint/400622
ISSN: 1094-4087
PURE UUID: 663211e4-0e68-46c0-85de-98259354be35

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Date deposited: 19 Sep 2016 15:51
Last modified: 17 Jul 2017 18:10

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