Performance analysis of hybrid decode-amplify-forward (HDAF) relaying for improving security in cooperative wireless network

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.