Receiver design for SPAD-based VLC systems under Poisson-Gaussian mixed noise model
Receiver design for SPAD-based VLC systems under Poisson-Gaussian mixed noise model
Single-photon avalanche diode (SPAD) is a promising photosensor because of its high sensitivity to optical signals in weak illuminance environment. Recently, it has drawn much attention from researchers in visible light communications (VLC). However, existing literature only deals with the simplified channel model, which only considers the effects of Poisson noise introduced by SPAD, but neglects other noise sources. Specifically, when an analog SPAD detector is applied, there exists Gaussian thermal noise generated by the transimpedance amplifier (TIA) and the digital-to-analog converter (D/A). Therefore, in this paper, we propose an SPAD-based VLC system with pulse-amplitude-modulation (PAM) under Poisson-Gaussian mixed noise model, where Gaussian-distributed thermal noise at the receiver is also investigated. The closed-form conditional likelihood of received signals is derived using the Laplace transform and the saddle-point approximation method, and the corresponding quasi-maximum-likelihood (quasi-ML) detector is proposed. Furthermore, the Poisson-Gaussian-distributed signals are converted to Gaussian variables with the aid of the generalized Anscombe transform (GAT), leading to an equivalent additive white Gaussian noise (AWGN) channel, and a hard-decision-based detector is invoked. Simulation results demonstrate that, the proposed GAT-based detector can reduce the computational complexity with marginal performance loss compared with the proposed quasi-ML detector, and both detectors are capable of accurately demodulating the SPAD-based PAM signals.
799-809
Mao, Tianqi
b0e1c806-8540-4a49-a523-6afc6ee7714e
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
10 January 2017
Mao, Tianqi
b0e1c806-8540-4a49-a523-6afc6ee7714e
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Mao, Tianqi, Wang, Zhaocheng and Wang, Qi
(2017)
Receiver design for SPAD-based VLC systems under Poisson-Gaussian mixed noise model.
Optics Express, 25 (2), .
(doi:10.1364/OE.25.000799).
Abstract
Single-photon avalanche diode (SPAD) is a promising photosensor because of its high sensitivity to optical signals in weak illuminance environment. Recently, it has drawn much attention from researchers in visible light communications (VLC). However, existing literature only deals with the simplified channel model, which only considers the effects of Poisson noise introduced by SPAD, but neglects other noise sources. Specifically, when an analog SPAD detector is applied, there exists Gaussian thermal noise generated by the transimpedance amplifier (TIA) and the digital-to-analog converter (D/A). Therefore, in this paper, we propose an SPAD-based VLC system with pulse-amplitude-modulation (PAM) under Poisson-Gaussian mixed noise model, where Gaussian-distributed thermal noise at the receiver is also investigated. The closed-form conditional likelihood of received signals is derived using the Laplace transform and the saddle-point approximation method, and the corresponding quasi-maximum-likelihood (quasi-ML) detector is proposed. Furthermore, the Poisson-Gaussian-distributed signals are converted to Gaussian variables with the aid of the generalized Anscombe transform (GAT), leading to an equivalent additive white Gaussian noise (AWGN) channel, and a hard-decision-based detector is invoked. Simulation results demonstrate that, the proposed GAT-based detector can reduce the computational complexity with marginal performance loss compared with the proposed quasi-ML detector, and both detectors are capable of accurately demodulating the SPAD-based PAM signals.
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Accepted/In Press date: 5 January 2017
e-pub ahead of print date: 10 January 2017
Published date: 10 January 2017
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[© 2017] [Optical Society of America.]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
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Southampton Wireless Group
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Local EPrints ID: 404377
URI: http://eprints.soton.ac.uk/id/eprint/404377
ISSN: 1094-4087
PURE UUID: 97b4a99f-80ba-49b7-8932-2b318633000d
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Date deposited: 09 Jan 2017 11:35
Last modified: 15 Mar 2024 04:06
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Author:
Tianqi Mao
Author:
Zhaocheng Wang
Author:
Qi Wang
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