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Scientia Sinica Informationis

Security performance analysis of DF relay selection systems

Huan Zhang, Gaofeng Pan, Hongjiang Lei, Junjie LIU

Published Aug 23, 2017• 0 citations
Publisher

Abstract

In this work, we investigate the security performance of adaptive decode-and-forward cooperative networks when the signals transmitted from source and relay would be wiretapped. Based on whether the channel state information (CSI) of the wiretap link is available or not, optimal relay selection (ORS), conventional relay selection (CRS), and multiple relays selection (MRS) schemes are considered, and the exact closed-form expressions for security outage probability (SOP) are derived. Besides, we obtain the closed-form expressions for the secrecy diversity order and secrecy array gain of the three different selection schemes through asymptotic analysis. Simulations are presented to validate the accuracy of our proposed analytical results and illustrate that ORS is the best scheme. Furthermore, asymptotic analysis reveals that the secrecy diversity order of each scheme is the same and closely related to the number of relays. The impact of the wiretap channels is only reflected in the secrecy array gain. Finally, we determine the optimal power allocation between the source and relay.

DOI
10.1360/n112017-00002

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In this work, we investigate the security performance of adaptive decode-and-forward cooperative networks when the signals transmitted from source and relay would be wiretapped. Based on whether the channel state information (CSI) of the wiretap link is available or not, optimal relay selection (ORS), conventional relay selection (CRS), and multiple relays selection (MRS) schemes are considered, and the exact closed-form expressions for security outage probability (SOP) are derived. Besides, we obtain the closed-form expressions for the secrecy diversity order and secrecy array gain of the three different selection schemes through asymptotic analysis. Simulations are presented to validate the accuracy of our proposed analytical results and illustrate that ORS is the best scheme. Furthermore, asymptotic analysis reveals that the secrecy diversity order of each scheme is the same and closely related to the number of relays. The impact of the wiretap channels is only reflected in the secrecy array gain. Finally, we determine the optimal power allocation between the source and relay.
In this paper, we present a comprehensive investigation on the secrecy performance of opportunistic relay selection systems employing the decode-and-forward protocol over Rayleigh fading channels. Considering a practical setting where direct link between the source node (Alice) and the destination node (Bob) is available, we study the secrecy performance of three different diversity combining schemes, namely, maximum ratio combining (MRC), distributed selection combining (DSC), and distributed switch-and-stay combining (DSSC). Throughout the analysis, we consider two different scenarios based on the availability of the eavesdropper's channel state information (CSI), i.e., Scenario A, where the eavesdropper's CSI is not available at Alice and the relay, and Scenario B, where Alice and the relay have knowledge about the eavesdropper's CSI. For Scenario A, we derive exact closed-form expressions for secrecy outage probability and simple asymptotic approximations for the secrecy outage probability, which enable the characterization of the achievable secrecy diversity order and coding gains. For Scenario B, we derive closed-form expressions for the achievable secrecy rates. For both scenarios, we investigate the impact of feedback delay (outdated CSI) on the secrecy performance wherein exact and asymptotic secrecy outage probability and closed-form expressions of the secrecy achievable rates are obtained. Our analytical findings suggest that both the MRC and DSC schemes achieve the maximum diversity order of K+1 where K is the number of relays. In addition, the feedback delay has a significant impact on the achievable secrecy performance by reducing the achievable diversity order to two.
This paper presents an investigation of the physical layer secrecy outage performance of the cooperative system in the typical four-node (source, relay, destination, and eavesdropper) scenario with imperfect channel state information (CSI). Specifically, we consider the single-input multiple-output wiretap channels, where the source (S) and the relay (R) are equipped with a single antenna, and the destination (D) and the eavesdropper (E) are equipped with multiple antennas. D and E adopt maximal ratio combining to process multiple copies of signals, and the relay adopts decode-and-forward (DF) and randomize-and-forward (RF) schemes to forward the received signal to the destination. E overhears the information transmitted over both the S-R and R-D links. We derive the closed-form and asymptotic expressions for the secrecy outage probability under both the DF and RF schemes with imperfect CSI, respectively, the accuracy of which is verified by simulation results.
In this paper, we consider a dual-hop decode-and-forward (DF) relay network which consists of a source, a destination and multiple DF relays in the presence of an eavesdropper, where the source transmits its data to the destination with the help of DF relays while the eavesdropper attempts to tap the relay transmissions. We examine the impact of channel estimation errors on the secrecy performance of source-destination transmissions and propose an optimal relay selection scheme for improving the transmission security against eavesdropping. To be specific, the proposed relay selection is designed by considering the fact that the channel state information (CSI) of any link from the source via DF relays to destination is inaccurate with channel estimation errors. The traditional round-robin relay selection is also considered for comparison purposes. We derive close-form expressions of the secrecy outage probability for both the proposed optimal relay selection scheme and traditional round-robin relay selection schemes. Numerical results demonstrate an adverse effect of the channel estimation errors on the secrecy outage probability of cooperative relay systems. Additionally, it is shown that the proposed optimal relay selection scheme substantially outperforms the traditional round-robin selection approach in terms of the secrecy outage probability.
We analyze the secrecy outage probability of selective relaying wiretap channels with K decode- and-forward (DF) relays and N collaborative eavesdroppers. In the main channel, we consider a two-hop relay network where the best relay is selected to transmit and the relay link is combined with the direct source-to-destination link at the destination. In the eavesdropper channel, we consider that the eavesdroppers can collaborate to exchange the information obtained from the source and relays. Different from previous works, we introduce an eavesdropping probability measure to model different intercepting capabilities of the malicious nodes. For this network, we derive new closed-form expressions for the secrecy outage probability in Rayleigh fading channels. The impact of the number of eavesdroppers and the eavesdropping probabilities are accurately reflected in the array gain of the asymptotic secrecy outage probability.
We analyze the secrecy outage probability of selective relaying wiretap channels with K decode- and-forward (DF) relays and N collaborative eavesdroppers. In the main channel, we consider a two-hop relay network where the best relay is selected to transmit and the relay link is combined with the direct source-to-destination link at the destination. In the eavesdropper channel, we consider that the eavesdroppers can collaborate to exchange the information obtained from the source and relays. Different from previous works, we introduce an eavesdropping probability measure to model different intercepting capabilities of the malicious nodes. For this network, we derive new closed-form expressions for the secrecy outage probability in Rayleigh fading channels. The impact of the number of eavesdroppers and the eavesdropping probabilities are accurately reflected in the array gain of the asymptotic secrecy outage probability.