Publication detail

Performance Analysis of Hybrid FSO Systems Using FSO/RF-FSO Link Adaptation

BAG, B. DAS, A. ANSARI, I. PROKEŠ, A. BOSE, C. CHANDRA, A.

Original Title

Performance Analysis of Hybrid FSO Systems Using FSO/RF-FSO Link Adaptation

Type

journal article in Web of Science

Language

English

Original Abstract

Free-space optical (FSO) links are considered as cost-effective, non-invasive 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 like outage probability, average bit error rate (BER) and capacity. Our results demonstrate that 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 (APS) 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.

Keywords

Free-space optics, 5G cellular backhaul, gamma-gamma fading, backup RF-FSO link, amplify-and-forward relay, link switching probability

Authors

BAG, B.; DAS, A.; ANSARI, I.; PROKEŠ, A.; BOSE, C.; CHANDRA, A.

Released

16. 5. 2018

Publisher

IEEE

ISBN

1943-0647

Periodical

IEEE Photonics Journal

Year of study

10

Number

3

State

United States of America

Pages from

1

Pages to

18

Pages count

18

URL

https://ieeexplore.ieee.org/document/8360015

Full text in the Digital Library

http://hdl.handle.net/11012/137214

BibTex

@article{BUT151097,
  author="Banibrata {Bag} and Akinchan {Das} and Imran Shafique {Ansari} and Aleš {Prokeš} and Chayanika {Bose} and Aniruddha {Chandra}",
  title="Performance Analysis of Hybrid FSO Systems Using FSO/RF-FSO Link Adaptation",
  journal="IEEE Photonics Journal",
  year="2018",
  volume="10",
  number="3",
  pages="1--18",
  doi="10.1109/JPHOT.2018.2837356",
  issn="1943-0647",
  url="https://ieeexplore.ieee.org/document/8360015"
}