PROJECT TITLE :

Opportunistic Relay Selection for Secrecy Enhancement in Cooperative Networks

ABSTRACT:

During this paper, we gift a comprehensive investigation on the secrecy performance of opportunistic relay selection systems employing the decode-and-forward protocol over Rayleigh fading channels. Considering a sensible setting where direct link between the supply node (Alice) and also the destination node (Bob) is on the market, we have a tendency to study the secrecy performance of 3 different diversity combining schemes, particularly, maximum ratio combining (MRC), distributed selection combining (DSC), and distributed switch-and-stay combining (DSSC). Throughout the analysis, we contemplate 2 completely different scenarios based mostly on the provision of the eavesdropper's channel state info (CSI), i.e., Situation A, where the eavesdropper's CSI isn't offered at Alice and also the relay, and State of affairs B, where Alice and therefore the relay have data about the eavesdropper's CSI. For State of affairs A, we have a tendency to derive actual closed-type expressions for secrecy outage probability and simple asymptotic approximations for the secrecy outage chance, which enable the characterization of the achievable secrecy diversity order and coding gains. For Scenario B, we derive closed-kind expressions for the achievable secrecy rates. For each situations, we investigate the impact of feedback delay (outdated CSI) on the secrecy performance whereby precise and asymptotic secrecy outage probability and closed-form expressions of the secrecy achievable rates are obtained. Our analytical findings suggest that each the MRC and DSC schemes achieve the utmost diversity order of $K+one$ where $K$ is the number of relays. Additionally, the feedback delay features a important impact on the achievable secrecy performance by reducing the achievable diversity order to two.


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