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Enhanced Physical Layer Security for Cooperative NOMA Network with Hybrid-Decode-Amplify-Forward Relaying via Power Allocation Assisted Control Jamming

V. Narasimha Nayak, Kiran Kumar Gurrala

Published Jul 10, 2021• 6 citations
Publisher
DOI
10.1007/s11277-021-08695-7

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Summary In this paper, the secrecy performance and power allocation of the signal‐to‐noise ratio‐based hybrid decode–amplify–forward (HDAF) relaying protocol in wireless cooperative network are investigated to get security at physical layer. The performance metrics considered are secrecy rate and intercept probability. The Ergodic secrecy rate is approximated theoretically. The effect of relay and eavesdropper locations on the secrecy performance of the system is analyzed. It is found that maximum secrecy rate is obtained for the relay close‐to‐destination case and minimum for the relay close‐to‐eavesdropper case. Jamming schemes are superior in secrecy rate performance than without jamming schemes. To enhance the secrecy rate further with the optimized relay and jammer powers, invasive weed optimization (IWO) algorithm‐based power allocation is proposed. Here, maximizing the secrecy rate is defined as the cost function for the proposed IWO algorithm‐based power allocation. Comparative study is done over the conventional equal and proposed power allocation schemes for validation. The proposed power allocation scheme proved to be superior. Copyright © 2016 John Wiley & Sons, Ltd.
This paper presents a new control jamming (CJ) scheme for AF relay aided NOMA network with optimal power allocation. The network contains a source, which forwards the multiplexed signal to the NOMA users by employment of AF relay. The jammer node forwards the interference signal to secure the confidential information of users against the eavesdropper attack. Secrecy rate enhancement at the NOMA user with the aid of CJ under total power constraint is taken as an optimization problem. The optimal power allocation factors of considered network are investigated using Invasive-Weed-Optimization (IWO) algorithm. The physical layer security of the network is analyzed in terms of secrecy rate under CJ condition. Furthermore, the secure performance gap between fixed and proposed power allocation schemes are examined with CJ and compared with other jamming conditions. Finally, the simulation results demonstrate that the secrecy performance is enhanced remarkably by CJ and proposed-power-allocation outperforms the fixed-power-allocation.
In this work, the secrecy of a typical wireless cooperative dual-hop non-orthogonal multiple access (NOMA)-enabled decode-and-forward (DF) relay network is investigated with the impact of collaborative and non-collaborative eavesdropping. The system model consists of a source that broadcasts the multiplexed signal to two NOMA users via a DF relay, and information security against the eavesdropper nodes is provided by a helpful jammer. The performance metric is secrecy rate and ergodic secrecy capacity is approximated analytically. In addition, a differential evolution algorithm-based power allocation scheme is proposed to find the optimal power allocation factors for relay, jammer, and NOMA users by employing different jamming schemes. Furthermore, the secrecy rate analysis is validated at the NOMA users by adopting different jamming schemes such as without jamming (WJ) or conventional relaying, jamming (J), and with control jamming (CJ). Simulation results demonstrate the superiority of CJ over the J and WJ schemes. Finally, the proposed power allocation outperforms the fixed power allocation under all conditions considered in this work.