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An optimal scaling scheme for DCO-OFDM based visible light communications

An optimal scaling scheme for DCO-OFDM based visible light communications
An optimal scaling scheme for DCO-OFDM based visible light communications
DC-biased optical orthogonal frequency-division multiplexing (DCO-OFDM) is widely used in visible light communication (VLC) systems to provide high data rate transmission. As intensity modulation with direct detection (IM/DD) is employed to modulate the OFDM signal, scale up the amplitude of the signal can increase the effective transmitted electrical power whereas more signals are likely to be clipped due to the limited dynamic range of LEDs, resulting in severe clipping distortion. Thus, it is crucial to scale the signal to find a tradeoff between the effective electrical power and the clipping distortion. In this paper, an optimal scaling scheme is proposed to maximize the received signal-to-noise-plus-distortion ratio (SNDR) with the constraint of the radiated optical power in a practical scenario where DC bias is fixed for a desired dimming level. Simulation results show that the system with the optimal scaling factor outperforms that with fixed scaling factor under different equivalent noise power in terms of the bit error ratio (BER) performance.
0030-4018
136-140
Jiang, Rui
5222e4f7-e7e1-4aff-a9d0-9fef1db084c2
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Wang, Fang
d5bae6ed-cb82-4b53-b837-dae55433febc
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Wang, Zhaocheng
a6bc4037-d26d-4ddd-9ce5-f018980115b6
Jiang, Rui
5222e4f7-e7e1-4aff-a9d0-9fef1db084c2
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Wang, Fang
d5bae6ed-cb82-4b53-b837-dae55433febc
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Wang, Zhaocheng
a6bc4037-d26d-4ddd-9ce5-f018980115b6

Jiang, Rui, Wang, Qi, Wang, Fang, Dai, Linglong and Wang, Zhaocheng (2015) An optimal scaling scheme for DCO-OFDM based visible light communications. Optics Communications, 356, 136-140. (doi:10.1016/j.optcom.2015.07.053).

Record type: Article

Abstract

DC-biased optical orthogonal frequency-division multiplexing (DCO-OFDM) is widely used in visible light communication (VLC) systems to provide high data rate transmission. As intensity modulation with direct detection (IM/DD) is employed to modulate the OFDM signal, scale up the amplitude of the signal can increase the effective transmitted electrical power whereas more signals are likely to be clipped due to the limited dynamic range of LEDs, resulting in severe clipping distortion. Thus, it is crucial to scale the signal to find a tradeoff between the effective electrical power and the clipping distortion. In this paper, an optimal scaling scheme is proposed to maximize the received signal-to-noise-plus-distortion ratio (SNDR) with the constraint of the radiated optical power in a practical scenario where DC bias is fixed for a desired dimming level. Simulation results show that the system with the optimal scaling factor outperforms that with fixed scaling factor under different equivalent noise power in terms of the bit error ratio (BER) performance.

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Accepted/In Press date: 21 July 2015
e-pub ahead of print date: 31 July 2015
Published date: 1 December 2015
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 400617
URI: https://eprints.soton.ac.uk/id/eprint/400617
ISSN: 0030-4018
PURE UUID: 06c1636f-4481-4f87-aafc-45304cd2fb72

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Date deposited: 20 Sep 2016 10:35
Last modified: 17 Jul 2017 18:11

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