Unified Performance Analysis of Multi-Hop FSO Systems Over Double Generalized Gamma Turbulence Channels With Pointing Errors
Autor: | Behnam Ashrafzadeh, Ehsan Soleimani-Nasab, Murat Uysal, Amir Zaimbashi |
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Rok vydání: | 2020 |
Předmět: |
Computer science
business.industry Applied Mathematics Monte Carlo method 020206 networking & telecommunications 02 engineering and technology Communications system Topology Computer Science Applications Diversity gain Channel state information 0202 electrical engineering electronic engineering information engineering Bit error rate Wireless Fading Heterodyne detection Electrical and Electronic Engineering business Intensity modulation Computer Science::Information Theory Communication channel |
Zdroj: | IEEE Transactions on Wireless Communications. 19:7732-7746 |
ISSN: | 1558-2248 1536-1276 |
DOI: | 10.1109/twc.2020.3015780 |
Popis: | Free space optical (FSO) communication systems provide high bandwidth in unregulated spectrum and act as a powerful line-of-sight wireless connectivity solution. The performance of FSO systems can be seriously impaired by fading as a result of atmospheric turbulence and/or pointing errors due to misalignment. In the context of FSO systems, relaying was proposed as an effective fading mitigation technique due to the fact that the variance is distance-dependent in turbulence channels. In this article, we present a unified performance analysis of multi-hop FSO systems over Double Generalized Gamma (DGG) turbulence channels with pointing error impairments. We assume amplify-and-forward relaying and consider both heterodyne detection and intensity modulation with direct detection. We derive tight closed-form expressions for the outage probability and bit error probability of both fixed-gain and channel state information (CSI)-assisted relaying in terms of the bivariate Fox-H functions and Fox-H functions, respectively. We further analyze asymptotic behavior of the outage probability in terms of simple elementary functions and obtain the achievable diversity orders. Diversity gain is found to be a function of atmospheric turbulence parameters, pointing error, detection type and the number of hops. Monte Carlo simulation results are further provided to verify the accuracy of the derived expressions. |
Databáze: | OpenAIRE |
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