Coherent Heterodyne Multilevel Polarization Shift Keying With Spatial Diversity in a Free-Space Optical Turbulence Channel

Tang, Xuan, Ghassemlooy, Zabih, Rajbhandari, Sujan, Popoola, Wasiu Oyewole and Lee, Chung Ghiu (2012) Coherent Heterodyne Multilevel Polarization Shift Keying With Spatial Diversity in a Free-Space Optical Turbulence Channel. Journal of Lightwave Technology, 30 (16). pp. 2689-2695. ISSN 0733-8724

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Official URL: http://dx.doi.org/10.1109/JLT.2012.2204859

Abstract

This paper proposes a coherent multilevel polarization shift keying (MPOLSK) modulation scheme using the spatial diversity detection in a free-space optical (FSO) turbulence channel. The symbol error probability (SEP) analysis for the proposed MPOLSK system under various turbulence regimes has been carried out. The power penalty caused by the phase tracking error has been investigated. For instance, the error floors of 1.3×10-5 and 3.4×10-3 are observed for 8POLSK with the phase tracking variances of σΔ = 0.3 and 0.5, respectively. The maximum ratio combining technique has been applied in the MPOLSK receiver in order to improve the SEP performance. To achieve a SEP of 10-9, the spatial diversity gains required for a 16POLSK-FSO employing four detectors are ~5.8, ~15.8, and ~13.7 dB in weak, moderate, and strong turbulence regimes, respectively.

Item Type: Article
Uncontrolled Keywords: coherent detection, free-space optical (FSO), maximum ratio combining (MRC), multilevel polarization shift keying (MPOLSK), spatial diversity, symbol error probability (SEP), turbulence
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics and Information Sciences
Depositing User: Sarah Howells
Date Deposited: 17 Sep 2012 11:24
Last Modified: 10 Aug 2015 11:16
URI: http://nrl.northumbria.ac.uk/id/eprint/8930

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