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Wireless Networks

Secrecy performance analysis of amplify-and-forward cooperative network with relay selection in the presence of multiple eavesdroppers

Mohammad Ali Torabi, Sahar Parkouk, Saeed Shokrollahi

Published May 1, 2021• 11 citations
Publisher
DOI
10.1007/s11276-021-02611-4

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Secure Multiuser Communications in Multiple Amplify-and-Forward Relay Networks

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This paper proposes relay selection to increase the physical layer security in multiuser cooperative relay networks with multiple amplify-and-forward relays, in the presence of multiple eavesdroppers. To strengthen the network security against eavesdropping attack, we present three criteria to select the best relay and user pair. Specifically, criteria I and II study the received signal-to-noise ratio (SNR) at the receivers, and perform the selection by maximizing the SNR ratio of the user to the eavesdroppers. To this end, criterion I relies on both the main and eavesdropper links, while criterion II relies on the main links only. Criterion III is the standard max-min selection criterion, which maximizes the minimum of the dual-hop channel gains of main links. For the three selection criteria, we examine the system secrecy performance by deriving the analytical expressions for the secrecy outage probability. We also derive the asymptotic analysis for the secrecy outage probability with high main-to-eavesdropper ratio. From the asymptotic analysis, an interesting observation is reached: for each criterion, the system diversity order is equivalent to the number of relays regardless of the number of users and eavesdroppers.

IEEE Transactions on Communications•Aug 6, 2014•128 citations
In this paper, SNR based hybrid decode-amplify-forward (HDAF) is introduced for improving the physical layer security of wireless cooperative network and its performance is analyzed in flat Rayleigh fading channel environment with three relay and jammer selection schemes namely conventional selection (without jammer), optimal selection (with jammer) and control jamming. We consider a linear cooperative wireless network consisting of one source, one destination with multiple relays in presence of single eavesdropper. Monte Carlo simulations are carried out and the obtained results are compared for different relay, jammer and eavesdropper locations. A study of comparison is made in terms of secrecy capacity for the proposed hybrid decode-amplify-forward (HDAF) relaying with the AF and DF relaying schemes. Finally from the simulated comparison study, it is observed that HDAF scheme outperforms AF and DF schemes and we can also observe control jamming selection achieves more secrecy rate compared to without jamming and with optimal jamming.
We consider a two-hop adaptive decode-amplify-forward (DAF) relay network. The collaborative network consists of a source, multiple hybrid relays, a destination, and an eavesdropper. The relays would help forward source information reliably to the destination node in the eavesdropper’s presence. Specifically, the relays decode its received noisy signal from the source, amplify it adaptively, and then forward it to the destination. We derive and propose a lower bound on this adaptation factor at the relay to meet an outage probability constraint. Note that only one selected relay participates in the processing and forwarding the signal to the destination that uses the maximal ratio combining (MRC) diversity combining techniques with imperfect channel state information (CSI). For the proposed cooperative network model, we derive the expression for the received signal power to interference plus noise power ratio (SINR) and secrecy capacity in the presence of estimation errors. We compare the secrecy performance of the proposed outage-based power adaptive cooperative network for the MRC and the selection combining (SC) diversity techniques at the destination. The analysis and numerical results on secrecy capacity serve as a useful benchmark in cooperative networks with multiple hybrid relays.
This paper proposes relay selection to increase the physical layer security in multiuser cooperative relay networks with multiple amplify-and-forward relays, in the presence of multiple eavesdroppers. To strengthen the network security against eavesdropping attack, we present three criteria to select the best relay and user pair. Specifically, criteria I and II study the received signal-to-noise ratio (SNR) at the receivers, and perform the selection by maximizing the SNR ratio of the user to the eavesdroppers. To this end, criterion I relies on both the main and eavesdropper links, while criterion II relies on the main links only. Criterion III is the standard max-min selection criterion, which maximizes the minimum of the dual-hop channel gains of main links. For the three selection criteria, we examine the system secrecy performance by deriving the analytical expressions for the secrecy outage probability. We also derive the asymptotic analysis for the secrecy outage probability with high main-to-eavesdropper ratio. From the asymptotic analysis, an interesting observation is reached: for each criterion, the system diversity order is equivalent to the number of relays regardless of the number of users and eavesdroppers.