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Wireless Personal Communications

Cooperative Relaying Protocol for Improving Physical Layer Security in Wireless Decode-and-Forward Relaying Networks

Jong-Ho Lee

Published Apr 16, 2015• 10 citations
Publisher
DOI
10.1007/s11277-015-2580-2

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In this paper, SNR based hybrid decode-amplify-forward (HDAF) is introduced for improving the physical layer security of wireless cooperative network and its performance is analyzed in flat Rayleigh fading channel environment with three relay and jammer selection schemes namely conventional selection (without jammer), optimal selection (with jammer) and control jamming. We consider a linear cooperative wireless network consisting of one source, one destination with multiple relays in presence of single eavesdropper. Monte Carlo simulations are carried out and the obtained results are compared for different relay, jammer and eavesdropper locations. A study of comparison is made in terms of secrecy capacity for the proposed hybrid decode-amplify-forward (HDAF) relaying with the AF and DF relaying schemes. Finally from the simulated comparison study, it is observed that HDAF scheme outperforms AF and DF schemes and we can also observe control jamming selection achieves more secrecy rate compared to without jamming and with optimal jamming.
We employed node cooperation in a cooperative wireless network to achieve physical layer- based security. The case of a source-destination pair that works with the assistance of multiple cooperating nodes in the presence of an eavesdropper was considered in this study to improve the performance of secure wireless communications. A novel cooperative scheme, called the decode-and-forward plus cooperative jamming (DFCJ), was proposed. In this scheme, relay nodes transmit a weighted version of the source signals plus a common weighted jamming signal to confound the eavesdropper. The novel system design was proposed to determine cooperative node weights and transmit power allocation. In DFCJ, a closed-form solution is obtained to minimize the total transmit power that is subjected to a secrecy rate constraint under complete nulling of jamming signals at the destination. The results of the numerical evaluation of the transmit power and the obtained secrecy rate show that the proposed scheme can significantly improve the performance of wireless physical layer security compared with the original decode-and-forward scheme.
This paper investigates the security at the physical layer of cooperative relay communications. Inspired by the principle of physical-layer network coding (PNC), we propose a new secure relaying scheme, namely secure PNC-based modify-and-forward (SPMF). In the proposed scheme, the relay node linearly combines the decoded data from the source node with an encrypted key before conveying the mixed data to the destination node. As both the linear PNC operation and encrypted key at the relay are unknown to the eavesdropper, the SPMF scheme provides a double security level in the system. Particularly, taking into account the practical scenario of the imperfect knowledge shared between the relay and destination, the secrecy outage probability (SOP) of the proposed SPMF scheme is analysed and evaluated in comparison with modify-and-forward, cooperative jamming, decode-and- forward and direct transmission schemes. The proposed scheme is shown to achieve a performance improvement of up to 3 dB when compared to the conventional schemes under imperfect knowledge of shared information between the nodes.