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International Journal of Communication Systems

Optimal power allocation‐based novel control jamming scheme for nonorthogonal multiple access enabled decode‐and‐forward relay network

V. Narasimha Nayak, Kiran Kumar Gurrala

Published Apr 28, 2021• 2 citations
Publisher

Abstract

Summary In this work, a new control jamming (CJ) scheme has been proposed for a cooperative nonorthogonal multiple access (NOMA) network with optimal power allocation factors by employing decode‐and‐forward (DF) relay. Maximization of secrecy rate at both NOMA users with the aid of CJ under total transmit power constraint is considered as an optimization problem. In this regard, invasive weed optimization (IWO) algorithm‐based approach is proposed to facilitate optimal power allocation for the considered network. In this analysis, performance metric secrecy rate is analyzed with CJ at both NOMA users by varying the location of eavesdropper with respect to the relay and jammer. In addition, the performance of fixed power allocation (FPA) and proposed power allocation (PPA) schemes is investigated with CJ and compared with jamming (J) and without jamming (WJ) conditions. Simulation result analysis specifies that secrecy performance is enhanced remarkably by CJ and PPA outperforms the FPA.

DOI
10.1002/dac.4845

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Summary In this work, a new control jamming (CJ) scheme has been proposed for a cooperative nonorthogonal multiple access (NOMA) network with optimal power allocation factors by employing decode‐and‐forward (DF) relay. Maximization of secrecy rate at both NOMA users with the aid of CJ under total transmit power constraint is considered as an optimization problem. In this regard, invasive weed optimization (IWO) algorithm‐based approach is proposed to facilitate optimal power allocation for the considered network. In this analysis, performance metric secrecy rate is analyzed with CJ at both NOMA users by varying the location of eavesdropper with respect to the relay and jammer. In addition, the performance of fixed power allocation (FPA) and proposed power allocation (PPA) schemes is investigated with CJ and compared with jamming (J) and without jamming (WJ) conditions. Simulation result analysis specifies that secrecy performance is enhanced remarkably by CJ and PPA outperforms the FPA.
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.
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.
This paper presents a new control-jammer (CJ) strategy for improving the secrecy outage probability (SOP) in a non-orthogonal multiple access (NOMA) network with a decode-and-forward (DF) relay. The network configuration involves a source transmitting a composite signal to NOMA users with the assistance of a DF relay. In order to safeguard the users' confidential data from an eavesdropper (Eve), a jammer is deployed. The primary objective of the optimization problem is to minimize the SOP for the NOMA users in the presence of Eve. Under the CJ condition, this paper evaluates the network's physical layer security. Extensive analysis is conducted to compare the performance gap between CJ and other jamming conditions. Through comprehensive simulation results, this study showcases a substantial enhancement in secrecy performance achieved by the proposed CJ scheme at both users, demonstrating its effectiveness in improving the security of the DF relay aided NOMA network.
Summary Cooperative communication based on relaying nodes has been considered as a promising technique to increase the physical layer security (PLS) performance in wireless communications. In this paper, an optimal power allocation (OPA) scheme based on Nelder‐Mead (NM) algorithm is proposed for improving the secrecy rate of amplify‐and‐forward (AF) cooperative relay networks employing cooperative jamming (CJ) scheme. The proposed hybrid jamming scheme allows the source and selected relay to transmit the jamming signal along with the information to confound the eavesdropper. The path selection probability of ant colony optimization (ACO) algorithm is used for selecting the relay for transmission. The performance based on secrecy rate is evaluated for “n” trusted relays distributed dispersedly between the source and destination. Gradient‐based optimization and three‐dimensional exhaustive search methods are used as benchmark schemes for comparison of the proposed power optimization algorithm. The secrecy performance is also compared with conventional AF scheme and CJ scheme without power optimization (EPA). The impact of single and multiple relays on secrecy performance is also evaluated. Numerical results reveal that, compared with the gradient method and exhaustive search algorithm, the proposed power allocation strategy achieves optimal performance. Also, the derived OPA results show a significantly higher secrecy rate than the EPA strategy for both CJ and AF schemes.
This paper investigates the secrecy performance of a multi-relay non-orthogonal multiple access (NOMA) network. Considering the presence of eavesdroppers, an optimal relay selection scheme and a jamming signal transmission scheme for both amplify-and-forward (AF) and decode-and-forward (DF) strategies are proposed. However, the resource allocation problem aimed at maximizing the effective secure throughput (EST) of the system is non-convex. It is difficult to directly solve this optimization problem using conventional methods. As such, a Q-learning approach to solve the resource allocation problem in this system is applied, and an innovative reward function that can maximize the communication quality of edge users while ensuring secure communication of nearby users is designed. According to the analysis of the simulation results, the convergence of the proposed scheme is verified. Under the same conditions, DF relays achieve a higher signal-to-noise ratio (SINR) at the user terminal, and the EST is closely related to the transmission power of the source node and the relays. The numerical results also show that compared to conventional power allocation methods, the proposed method achieves a larger average EST and provides better confidentiality performance.
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.