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The Journal of the Institute of Webcasting, Internet and Telecommunication

Performance Analysis of Physical Layer Security based on Decode-and-Forward using Jammer

Park Sol, Hyung-Yun Kong

Published Jan 1, 2018• 0 citations
Publisher
DOI
10.7236/jiibc.2018.18.3.71

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Physical Layer Security for Combating Jammers and Eavesdroppers

Mahdi M. Chehimi

•Sep 23, 2020•0 citations
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.
In this paper, we explore a cooperative decode-and-forward (DF) relay network comprised of a source, a relay, and a destination in the presence of an eavesdropper. To improve physical-layer security of the relay system, we propose a jamming aided decode-and-forward relay (JDFR) scheme combining the use of artificial noise and DF relaying which requires two stages to transmit a packet. Specifically, in stage one, the source sends confidential message to the relay while the destination acts as a friendly jammer and transmits artificial noise to confound the eavesdropper. In stage two, the relay forwards its re-encoded message to the destination while the source emits artificial noise to confuse the eavesdropper. In addition, we analyze the security-reliability tradeoff (SRT) performance of the proposed JDFR scheme, where security and reliability are evaluated by deriving intercept probability (IP) and outage probability (OP), respectively. For the purpose of comparison, SRT of the traditional decode-and-forward relay (TDFR) scheme is also analyzed. Numerical results show that the SRT performance of the proposed JDFR scheme is better than that of the TDFR scheme. Also, it is shown that for the JDFR scheme, a better SRT performance can be obtained by the optimal power allocation (OPA) between the friendly jammer and user.