Performance analysis of free space optical links over turbulence and misalignment induced fading channels

Lee, It Ee, Ghassemlooy, Zabih, Ng, Wai Pang and Uysal, Murat (2012) Performance analysis of free space optical links over turbulence and misalignment induced fading channels. In: Proceedings of the 8th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP). IEEE, Piscataway, NJ. ISBN 978-1457714726

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Abstract

The performance of free-space optical (FSO) communication system is investigated from the information theory perspective, under the influence of atmospheric loss and channel fading due to the turbulence and pointing error. The outage probability and average channel capacity of the FSO link are evaluated using a combined slow-fading channel model and a Gaussian beam wave model, unlike the limiting Rytov-based scintillation model considered in earlier work. Taking into account various link design criteria, our study reveals that lower outage probability can be achieved with larger receiver aperture due to the aperture averaging effect. Optimization of the capacity metrics is best performed through proper selection of the aperture size and beam width for known laser wavelength, particularly for long-distance links and strong turbulence scenarios. Hence, findings and results from our analysis can be treated as the design benchmark for optimal planning and deployment of optical links.

Item Type: Book Section
Uncontrolled Keywords: free-space optical (FSO) communications, atmospheric turbulence, Gaussian-beam wave, outage probability, average (ergodic) capacity
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics and Information Sciences
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Depositing User: Sarah Howells
Date Deposited: 28 Sep 2012 11:05
Last Modified: 10 Nov 2016 12:38
URI: http://nrl.northumbria.ac.uk/id/eprint/9253

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