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Wireless Personal Communications

Secure Communication in Amplify-and-Forward Networks with Multiple Eavesdroppers: Decoding with SNR Thresholds

Siddhartha Sarma, Samar Agnihotri, Joy Kuri B

Published Jul 22, 2015• 4 citations
Publisher
DOI
10.1007/s11277-015-2881-5

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Beam-forming for Secure Communication in Amplify-and-Forward Networks: An SNR based approach

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The problem of secure communication in Amplify-and-Forward (AF) relay networks with multiple eavesdroppers is considered. Assuming that a receiver (destination or eavesdropper) can decode a message only if the received SNR is above a predefined threshold, we introduce SNR based optimization formulations to calculate optimal scaling factors for relay nodes in two scenarios. In the first scenario, we maximize the achievable rate at the legitimate destination, subject to the condition that the received SNR at each eavesdropper is below the target threshold. Due to the non-convex nature of the objective function and eavesdroppers' constraints, we transform variables and obtain a Quadratically Constrained Quadratic Program (QCQP) with convex constraints, which can be solved efficiently. When the constraints are not convex, we consider a Semi-definite relaxation (SDR). In the second scenario, we minimize the total power consumed by all relay nodes, subject to the condition that the received SNR at the legitimate destination is above the threshold and at every eavesdropper, it is below the corresponding threshold. We propose a semi-definite relaxation of the problem in this scenario and also provide an analytical lower bound.

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Performance analysis of hybrid decode-amplify-forward (HDAF) relaying for improving security in cooperative wireless network

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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.

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

Lisheng Fan, Xianfu Lei, Trung Q. Duong +2 more

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
The problem of secure communication in Amplify-and-Forward (AF) relay networks with multiple eavesdroppers is considered. Assuming that a receiver (destination or eavesdropper) can decode a message only if the received SNR is above a predefined threshold, we introduce SNR based optimization formulations to calculate optimal scaling factors for relay nodes in two scenarios. In the first scenario, we maximize the achievable rate at the legitimate destination, subject to the condition that the received SNR at each eavesdropper is below the target threshold. Due to the non-convex nature of the objective function and eavesdroppers' constraints, we transform variables and obtain a Quadratically Constrained Quadratic Program (QCQP) with convex constraints, which can be solved efficiently. When the constraints are not convex, we consider a Semi-definite relaxation (SDR). In the second scenario, we minimize the total power consumed by all relay nodes, subject to the condition that the received SNR at the legitimate destination is above the threshold and at every eavesdropper, it is below the corresponding threshold. We propose a semi-definite relaxation of the problem in this scenario and also provide an analytical lower bound.
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.
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.