Performance analysis of secure AF relay networks using cooperative jamming under outdated CSI. Issue 14 (27th September 2017)

• Record Type: Journal Article
• Authors: Mabrouk, Asma; Tourki, Kamel; Hasna, Mazen O.; Hamdi, Noureddine
• Is Part Of: IET communications. Volume 11:Issue 14(2017)
• Page Start: 2199
• Page End: 2205
• Publication Date: 2017-09-27
• Subjects: amplify and forward communication -- relay networks (telecommunication) -- cooperative communication -- probability -- jamming; secure AF relay networks -- cooperative jamming -- outdated CSI -- cooperative transmission -- outdated channel state information -- opportunistic relaying -- destination‐based jamming scheme -- ergodic secrecy capacity -- ESC -- secrecy outage probability -- SOP -- power allocation; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2017.0412
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : 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 With outdated channel state information (CSI), we propose an opportunistic relaying with destination‐based jamming scheme, where one relay is chosen to forward the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 We verify that, with outdated CSI, the secrecy performance of opportunistic relaying is severely degraded.