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Appl. Sci. 2018, 8(6), 872; https://doi.org/10.3390/app8060872

Differential Signalling in Free-Space Optical Communication Systems

1
School of Engineering, University of Glasgow, Glasgow G12 8LT, UK
2
Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
3
Department of Electrical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India
4
Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, 2 Technicka, 16627 Prague, Czech Republic
5
Aix-Marseille University, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
*
Authors to whom correspondence should be addressed.
Received: 18 April 2018 / Revised: 14 May 2018 / Accepted: 18 May 2018 / Published: 25 May 2018
(This article belongs to the Special Issue Optical Wireless Communications)
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Abstract

In this paper, we review the differential signalling techniques and investigate its implementation of in free-space optical (FSO) communication systems. The paper is an extended version of our previous works, where the effects of background noise, weak turbulence and pointing errors (PE) were investigated separately. Here, for the first time, we present a thorough description of the differential signalling scheme including for combined effects. At first, we present an extension of the analysis of differential signalling to the case of moderate to strong atmospheric turbulence. Next, we investigate a more general case where both channel turbulence and PE are taken into consideration. We provide closed-form expressions for the optimal detection threshold and the average bit-error-rate, and present a set of numerical results to illustrate the performance improvement offered by the proposed differential signalling under various turbulence and PE conditions. View Full-Text
Keywords: free-space optical communication; differential signalling; atmospheric turbulence; pointing errors; optimal signal detection; NRZ-OOK free-space optical communication; differential signalling; atmospheric turbulence; pointing errors; optimal signal detection; NRZ-OOK
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Mansour Abadi, M.; Ghassemlooy, Z.; Bhatnagar, M.R.; Zvanovec, S.; Khalighi, M.-A.; Lavery, M.P.J. Differential Signalling in Free-Space Optical Communication Systems. Appl. Sci. 2018, 8, 872.

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