Performance analysis of hybrid FSO systems using FSO/RF-FSO link adaptation

Bag, B., Das, A., Ansari, I. S. , Prokes, A., Bose, C. and Chandra, A. (2018) Performance analysis of hybrid FSO systems using FSO/RF-FSO link adaptation. IEEE Photonics Journal, 10(3), pp. 1-17. (doi:10.1109/JPHOT.2018.2837356)

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Free-space optical (FSO) links are considered as cost-effective, noninvasive alternative to fiber optic cables for 5G cellular backhaul networking. For FSO-based backhaul networks, we propose an additional millimeter-wavelength (MMW) radio-frequency (RF)-FSO link, used as a backup. Uninterrupted and reliable network connection is possible by switching between primary FSO link and the secondary RF-FSO link; when the primary link is under atmospheric turbulence, the secondary link maintains connectivity as the MMW RF link exhibits complementary characteristics to atmospheric effects. In order to analytically assess the improvement, we also derive concise mathematical expressions for different performance metrics, such as outage probability, average bit error rate (BER), and capacity. Our results demonstrate that the FSO/RF-FSO topology performs better than a single FSO link in terms of outage probability and BER. The dual-hop mixed RF-FSO link is realized with an amplify and forward (AF) relay that adapts an average power scaling strategy. The irradiance fluctuations in the FSO links are modeled by gamma-gamma distribution, assuming strong atmospheric turbulence while it is assumed that the RF link experiences multipath Rayleigh fading. For switching between links, a single FSO threshold is considered first, followed by a dual FSO threshold to prevent unnecessary switching.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Ansari, Dr Imran
Authors: Bag, B., Das, A., Ansari, I. S., Prokes, A., Bose, C., and Chandra, A.
College/School:College of Science and Engineering > School of Engineering
Journal Name:IEEE Photonics Journal
Publisher:Institute of Electrical and Electronics Engineers
ISSN (Online):1943-0655
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in IEEE Photonics Journal 10(3):1-17
Publisher Policy:Reproduced under a Creative Commons License

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