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Balkan Journal of Electrical and Computer Engineering

Secrecy Analysis of Multi-user Half/Full-Duplex Wireless Bi-directional Relaying Network

Volkan Özduran

Published Jul 29, 2019• 3 citations
Publisher

Abstract

This paper investigates the physical layer security of orthogonal frequency division multiplexing technique. The investigation considers a multi-user untrustworthy half/full-duplex based two-way wireless relay with a finite number of friendly jammers in the system model. According to Monte-Carlo simulation results, the system model that operates in full-duplex mode achieves slightly better secrecy outage performance than the system model that operates in half-duplex mode. The results also show that friendly jammers, besides minimizing the information leakage, degrade the system performance severely and cause system coding gain losses in high signal-to-noise ratios.

DOI
10.17694/bajece.518904

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•Apr 1, 2026•0 citations
This paper investigates the physical layer security of orthogonal frequency division multiplexing technique. The investigation considers a multi-user untrustworthy half/full-duplex based two-way wireless relay with a finite number of friendly jammers in the system model. According to Monte-Carlo simulation results, the system model that operates in full-duplex mode achieves slightly better secrecy outage performance than the system model that operates in half-duplex mode. The results also show that friendly jammers, besides minimizing the information leakage, degrade the system performance severely and cause system coding gain losses in high signal-to-noise ratios.
This paper investigates the physical layer security of the orthogonal frequency division multiplexing based wireless relaying network. The investigation considers a multi-user untrustworthy amplify-and-forward based one-way full-duplex wireless relaying network in the system model. According to the Monte-Carlo simulation results, the friendly jammers severely affect the system achievable secrecy outage probability performance and degrade the system performance curves in high signal-to-noise ratio regimes. Results also show that the system model that contains a large number of user-pairs achieves better secrecy performance in comparison to a small number of user-pairs.
This paper investigates the feedback delay effects on physical layer security. The investigation considers a dual-hop single amplify-and-forward based untrustworthy half/full-duplex two-way relay with a finite number of friendly jammers in the system model. According to the Monte-Carlo simulation results, the feedback delay degrades the system secrecy achievable rate and causes system coding gain losses in high signal-to-noise regimes. Results also show that if the number of friendly jammers in the system model increases then system secrecy achievable rate tends to degrade and causes system coding gain losses. Results also show that better system secrecy achievable rate can be achieved when the relay terminal operates in full-duplex mode.
This paper investigates the impact of the imperfect channel state information that is caused by the channel estimation errors on physical layer security. The investigation considers a dual-hop single amplify-and-forward (AF) based untrustworthy half/full-duplex bi-directional relay with a finite number of friendly jammers in the system model. According to Monte-Carlo simulation results, the channel estimation error causes system coding gain losses at low signal-to-noise ratio (SNR) regimes both for half and full-duplex cases. Results also show that the CEE effects turn out to be at negligible levels in high SNR regimes. Results also show that friendly jammer, besides improving the secrecy performance of the system model, also degrades the curves and causes system coding gain losses at high SNR regimes. Results also show that better secrecy performance can be achieved when the relay terminal operates in full-duplex mode.
The open broadcast nature of the wireless networks makes it vulnerable to the eavesdropper attacks. The physical layer security (PLS) is a grown research field that exploits the characteristics of the physical wireless channel to prevent the eavesdropper interruptions and attacks. The use of the cooperative relay transmission is a method to approach the physical layer security. This paper studies the secrecy performance metrics of the half-duplex two-way multi-relaying technique. A cooperative jamming protocol is proposed to enhance the physical layer security, where the destination sends jamming signals to the eavesdropper node to degrade its channel capacity. However, the relays can act as a jammer and send jamming signals to the eavesdropper node. Moreover, Simulations of the performance metrics namely the secrecy capacity (Cs) and the secrecy outage probability (SOP) applied on the technique are presented and discussed to measure the secrecy level of the proposed technique compared with an existing technique namely half-duplex one-way multi-relaying technique. Based on simulations and discussions the proposed technique outperforms the existing technique in term of secrecy performance.
This paper investigates the secrecy performance of full-duplex relay (FDR) networks. The resulting analysis shows that FDR networks have better secrecy performance than half duplex relay networks, if the self-interference can be well suppressed. We also propose a full duplex jamming relay network, in which the relay node transmits jamming signals while receiving the data from the source. While the full duplex jamming scheme has the same data rate as the half duplex scheme, the secrecy performance can be significantly improved, making it an attractive scheme when the network secrecy is a primary concern. A mathematic model is developed to analyze secrecy outage probabilities for the half duplex, the full duplex and full duplex jamming schemes, and the simulation results are also presented to verify the analysis.
Abstract This paper examines physical layer security in a NOMA-based two-way wireless communication system with several decode-and-forward relays and a malicious eavesdropper. We implement a partial relay selection system to maximize the secrecy capacity of a specific user's information signal. Two hops are involved in the communication process because of the half-duplex relay cooperation. A selected relay receives information from two users. The relay strengthens the signals and broadcasts them during the second hop. Additionally, a jammer transmits a jamming signal that is known to all legitimate nodes but appears as noise with the received signals at the eavesdropper. Since legitimate user nodes are already aware of the jamming signal, channel status information, and self-information, they can decode the original information in downlink mode by self-interference and successive interference cancellation. Secrecy outage probability, intercept probability, and secrecy throughput have been investigated as metrics to analyze the security, where the secrecy performance of a particular user is found to increase by 94.66 %94.66\, \%94.66% with an increment in transmit SNR of jamming from 60 dB60\, dB60dB to 70 dB70\, dB70dB and increases by 90.78 %90.78\, \%90.78% with an increment in the number of relays from 2 to 5.