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International Conference on Communications

Ergodic secrecy capacity analysis for cooperative communication with relay selection under non-identical distribution

Esa R. Alotaibi, Khairi Ashour Hamdi

Published May 1, 2016• 3 citations
Publisher

Abstract

In this paper, ergodic secrecy capacity is analyzed in a cooperative communication network, for an independent but non-identically distributed (i.n.i.d) Rayleigh fading channel. By using multi-trusted decode and forward relays, the model assumes direct links between a sender (Alice) and receiver nodes (Bob and an eavesdropper); in addition both Alice and the relay have perfect knowledge about the eavesdropper's channel state information (CSI). The protocol employed herein selects the best relay with the highest signal-to-noise ratio (SNR) in relation to the destination (Bob), while maximum ratio combining (MRC) is employed at Bob and the eavesdropper's terminals. Finally, the theoretical analysis is validated through simulation, and the results show that performance is enhanced with an increasing number of relays, in the event of a direct link between the sender and the receiver's terminals.

DOI
10.1109/icc.2016.7511532

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In this paper, ergodic secrecy capacity is analyzed in a cooperative communication network, for an independent but non-identically distributed (i.n.i.d) Rayleigh fading channel. By using multi-trusted decode and forward relays, the model assumes direct links between a sender (Alice) and receiver nodes (Bob and an eavesdropper); in addition both Alice and the relay have perfect knowledge about the eavesdropper's channel state information (CSI). The protocol employed herein selects the best relay with the highest signal-to-noise ratio (SNR) in relation to the destination (Bob), while maximum ratio combining (MRC) is employed at Bob and the eavesdropper's terminals. Finally, the theoretical analysis is validated through simulation, and the results show that performance is enhanced with an increasing number of relays, in the event of a direct link between the sender and the receiver's terminals.
In this paper, secrecy outage probability is analyzed in a cooperative network for an independent but non-identically distributed (i.n.i.d) Rayleigh fading channel. By using multi-trusted decode and forward relays, the model assumes direct links between a sender (Alice) and receiver nodes (Bob and an eavesdropper). The protocol employed herein selects the best relay with the highest signal-to-noise ratio (SNR) in relation to the destination (Bob). The eavesdropper's channel state information (CSI) is neither available to the sender nor to the best relay, while maximum ratio combining (MRC) is employed at Bob and the eavesdropper. Finally, the theoretical analysis is validated through simulation, and the results show that performance is enhanced with an increasing number of relays in the event of a direct link between the sender and the receiver's terminals.
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.
In this paper, a source communicates to the destination with the cooperation of a relay, in the presence of an eavesdropper. All the links undergo Rayleigh fading and perfect decoding at the relays is not considered. The secrecy outage probability expression is evaluated for a decode-and-forward (DF) dual-hop cooperative relay network, both with and without the presence of direct source to eavesdropper transmission link. The performance of the maximal ratio combining (MRC) and selection combining (SC) diversity at the eavesdropper is investigated. Asymptotic and diversity gain analysis for both the single relay and multi-relay system is obtained, when average SNRs of source-relay and relay-destination links are balanced or unbalanced. We have shown that the increase in target secrecy rate and eavesdropper channel quality significantly affects the outage performance of the system. We have investigated the outage probability of optimal relay selection scheme, when either full instantaneous channel state information (ICSI) or statistical channel state information (SCSI) of all the links is available and have shown that there is improvement in the secrecy performance with the increase in the number of relays.
In this paper, the secrecy outage probability of threshold-based decode-and-forward (DF) cooperative relay network is evaluated. Unlike other works to date, we assume combining of direct and relayed signals both at the destination and the eavesdropper. All the links undergo Rayleigh fading and the relay can perfectly decode the message, only if the received SNR meets a particular threshold. The secrecy performance is compared for the system with either selection combining (SC), or with maximal ratio combining (MRC) or with the combination of both, at the destination and eavesdropper. We have shown that the eavesdropper channel quality, required secrecy rate, pre-defined threshold and the choice of diversity scheme significantly affects the secrecy performance of the system.
In this paper, the secrecy of a cooperative system consisting of a single source, relay, destination and eavesdropper is analyzed. The threshold-selection decode-and-forward relay is considered, where the relay can correctly decode and forward only if it satisfies a threshold signal-to-noise ratio (SNR). Both destination and eavesdropper take advantage of the direct and relayed transmissions through maximal ratio diversity combining. The secrecy outage probability (SOP) and ergodic secrecy rate are derived in closed-form for different channel state information (CSI) availability. It was observed that when the required rate is low, having CSI knowledge is more advantageous than in the case of higher rate. An increase in the required threshold SNR at the relay can increase the SOP if the relayed link SNR is relatively higher than the direct link SNR. It was also shown that SOP cannot be improved beyond a certain value when keeping either dual-hop link average SNR fixed and increasing the other link SNR, whereas the ergodic secrecy rate can be increased by keeping the source to destination average SNR fixed.
In this paper, a confidential communication scenario is considered through selection decode-and-forward cooperative relay networks over Rayleigh fading channel in which a source communicates with a destination via multiple relays. A best relay is selected using selection combining technique which communicates with the destination. An eavesdropper observes their communication and tries to decode confidential information. In this situation, an interest is given to ensure secure communication between the best relay and the destination so that eavesdropper is unable to decode any information from the main channel (i.e. channel between relay and destination). The performance of the proposed model is analyzed based on the closed-form analytical expressions of the ergodic secrecy capacity and the secure outage probability taking into account the distances of relays from the source, destination and the eavesdropper. Analytical results show that the additional diversity provided by the best relay situated in a strategic location significantly improves the secure outage performance of the selection decode-and-forward relay networks.