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International Wireless Communications and Mobile Computing Conference (IWCMC)

Partial Relay Selection for Secure Outdated-CSI AF in Untrusted-Relay Networks

Wided Hadj Alouane

Published Jun 1, 2019• 5 citations
Publisher

Abstract

In this paper, we study secure outdated-channel-state-information amplify-and-forward (SO-CSI-AF) relaying network using partial relay selection method. The best relay node is chosen based on the maximum instantaneous signal-to-noise ratio (SNR) of the first hop. We analyze a system with one source, multiple untrusted relays and one destination, where the relays act as eavesdroppers and a source-assisted-jamming technique is adopted. The jamming signal is transmitted by the source node to convey the information signal. We provide a closed-form expression for ergodic secrecy capacity considering Rayleigh fading channels. The accuracy of our proposed analysis is well demonstrated by simulation results. Moreover, we compare partial relay selection with reactive relay selection in secure untrusted relay networks. We obtain that our proposed system provides better performance especially when the relay is placed closer to the destination.

DOI
10.1109/iwcmc.2019.8766537

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In this paper, we study secure outdated-channel-state-information amplify-and-forward (SO-CSI-AF) relaying network using partial relay selection method. The best relay node is chosen based on the maximum instantaneous signal-to-noise ratio (SNR) of the first hop. We analyze a system with one source, multiple untrusted relays and one destination, where the relays act as eavesdroppers and a source-assisted-jamming technique is adopted. The jamming signal is transmitted by the source node to convey the information signal. We provide a closed-form expression for ergodic secrecy capacity considering Rayleigh fading channels. The accuracy of our proposed analysis is well demonstrated by simulation results. Moreover, we compare partial relay selection with reactive relay selection in secure untrusted relay networks. We obtain that our proposed system provides better performance especially when the relay is placed closer to the destination.
This paper studies the secrecy performance of an untrusted amplify-and-forward relaying network where both the relaying and the direct links are used to convey the source's information. Since relays act as eavesdroppers, a source-based jamming technique is proposed to keep the source's message secret from these helper nodes. We analyze the secrecy capacity of partial relay selection based on outdated channel state information. The study is conducted analytically by deriving the lower-bound expression for the ergodic secrecy capacity (ESC). We demonstrate through the simulation results the tightness of the derived bound. The use of the direct link is shown to improve the secrecy performance of the proposed scheme. In this case, we found that ESC performance with maximum ratio combining at the destination is better than that with selection combining. The system performance worsens as the correlation coefficient decreases. Furthermore, the maximum of ESC is achieved when relays are in the middle between the source and the destination with equal power allocation between the information and the jamming signals at the source.
In this paper, we investigate a secure semi-blind amplify-and-forward (AF) relaying system over Rayleigh fading channels. We consider a reactive relay selection where the relay is selected based on the highest instantaneous signal-to-noise ratio (SNR) of the second hop. We evaluate the ergodic secrecy capacity using source-assisted jamming (SAJ) and considering that relays act as eavesdroppers. In order to improve the secrecy performance, a direct link between the source and destination is considered. Numerical results are presented to verify the accuracy of the proposed mathematical analysis. Moreover, a comparison between secure semi-blind AF relaying system and secure channel-state-information (CSI)-assisted AF relaying system is performed to further prove the exactness of our analysis. The proposed secure semi-blind AF relaying system has a simpler mathematical analysis and a comparable secrecy performance as compared to secure CSI-assisted AF relaying system.
This paper studies the problem of secure dual-hop AF network in the presence of eavesdropper. We study the secrecy performance of partial relay selection with outdated channel state information (CSI). We propose a system secrecy where two sources and destination simultaneously transmit the legitimate and the jamming signal respectively. The selected relay forwards the combined signal to the legitimate receiver and the eavesdropper. We derive a closed-form expression for lower bound on the ergodic secrecy capacity (ESC) under different assumptions of the eavesdropper channel gains. We verify that the system performance is degraded as the correlation coefficient decreases. Simulation results are considered to verify the exactness of the proposed mathematical analysis.
We investigate the effect of outdated channel state information (CSI) on the secrecy performance of wireless-powered untrusted relay networks, in which the relay is a potential eavesdropper. To keep the information secret from this untrusted relay, the destination sends a jamming signal to the relay when the source transmits an information signal. At the same time, the relay harvests energy from the radio-frequency power, and forwards the received signals to the destination using this harvested energy. To determine the proportions of energy harvesting and information processing, the relay makes use of relaying based on power splitting or time switching policy. Although the destination tries to remove the jamming signal from the relaying signal, it cannot cancel out the jamming signal perfectly due to imperfect channel reciprocity caused by the outdated CSI; this residual jamming signal therefore has a negative impact on secrecy performance. In this scenario, we derive the closed-form expressions for the outage probability and average secrecy rate, and find the jamming power ratio, power splitting ratio, and time switching ratio to optimize these secrecy performance metrics. The numerical results demonstrate the accuracy of our analysis, and show that the proposed secure relaying protocols achieve a near-optimal secrecy performance, as well as outperforming the conventional scheme without the jamming power control.
This paper studies cooperative transmission for securing a two‐hop network where the eavesdropper can wiretap the relay channels. With outdated channel state information (CSI), we propose an opportunistic relaying with destination‐based jamming scheme, where one relay is chosen to forward the confidential signal and the destination sends jamming signal to confuse the eavesdropper. To reveal the capability of the proposed scheme in improving the system secrecy, we investigate the two common performance metrics under different assumptions on the eavesdropper CSI. First, lower bound on the ergodic secrecy capacity (ESC) is derived assuming perfect knowledge of the eavesdropper channel gains. We, then, extend our results to the scenario where only the legitimate channel gain is known. Here, lower bound on the secrecy outage probability (SOP) is obtained. To further improve the utility of the destination, under total power constraint, a power allocation between data signal and jamming noise is considered. Both the analysis and simulation results indicate that the system performance is significantly improved in terms of both ESC and SOP when the jamming power at the destination is adjusted according to the selected relay position. We verify that, with outdated CSI, the secrecy performance of opportunistic relaying is severely degraded.
We evaluate the upper bound, lower bound and an approximate expression for secrecy outage probability of a dual hop Amplify-and-forward (AF) relay system when the single cooperating relay among the relays is selected without the knowledge of eavesdropper's instantaneous channel state information (CSI). This situation arises when eavesdropper is not a legitimate node, or being a trusted node, it acts maliciously and does not share its instantaneous CSI. We also obtain the tighter bounds in high signal-to-noise ratio (SNR) of the source to relay links and in high SNR of the relay to destination links. We show that when the SNR of the source to relay links tends to zero, it becomes the bottle neck for secure communication, and the secrecy outage tends to 1. We show that the approximate expression follows the simulated outage closely and the outage decreases with an increase in the number of relays and increases with an increase in the required secrecy rate.