Performance of Two-Way Relaying over \(\alpha\)-\(\mu\) Fading Channels in Hybrid RF/FSO Wireless Networks

In this paper, the performance of two-way relaying in mixed RF/FSO communication system with a backup RF link is investigated. Uplink RF channels are used to send data of \(K\) users to a two-way relay, \(R\), whereas FSO link is mainly used to exchange data between a base station \(S\) and \(R\). W...

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Bibliographic Details
Published in:arXiv.org 2019-11
Main Authors: Amer, Mohammed A, Al-Dharrab, Suhail
Format: Article
Language:English
Subjects:
Alpha rays
Atmospheric turbulence
Channels
Communications systems
Computer simulation
Exact solutions
Fading
Monte Carlo simulation
Nodes
Performance degradation
Radio frequency
Relay
Relaying
Reliability aspects
Signal to noise ratio
Wireless networks
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Summary:In this paper, the performance of two-way relaying in mixed RF/FSO communication system with a backup RF link is investigated. Uplink RF channels are used to send data of \(K\) users to a two-way relay, \(R\), whereas FSO link is mainly used to exchange data between a base station \(S\) and \(R\). We propose to have a backup RF link between the relay \(R\) and the node \(S\) to improve reliability under certain conditions. All uplink RF channels follow Rayleigh fading model while \(\alpha\)-\(\mu\) is adopted to model both backup RF and FSO links. We approximate the widely used Gamma-Gamma fading model using the \(\alpha\)-\(\mu\) distribution based on moments-based estimator technique assuming perfect alignment between transmitter and receiver antennas. This approximation shows good agreement under certain atmospheric turbulence conditions. Then, we derive exact closed-form expressions for the outage and average symbol error probabilities and derive approximations at high signal-to-noise ratio (SNR). We corroborate our analytical expressions with extensive Monte-Carlo simulations and demonstrate exact match. Furthermore, we analyze the effect of number of nodes, opportunistic scheduling among \(K\) nodes, and \(\alpha\)-\(\mu\) parameters on the overall performance of mixed RF/FSO and backup RF systems. Our numerical results illustrate an achievable coding gain when increasing \(K\); however, performance degradation occurs as the relay applies selection that favors the domination of specific links in the system.
ISSN:2331-8422