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IEEE Annual Computing and Communication Workshop and Conference (CCWC)

Physical Layer Security Improvement of Dual-Hop Dual-Relay Network Using Signal Space Diversity

Muhammad Ajmal Khan, Firas Hassan, Rhys Davies

Published Jan 26, 2022• 1 citation
Publisher

Abstract

We examine the physical-layer security performance of a conventional dual-hop dual-relay (DH-DR) network, where two decode-and-forward relays are used to facilitate the communication from the source to the destination without a direct link between the source and the destination. The conventional DH-DR system employs an ordinary modulation scheme such as a 4-QAM modulation. Thus, we propose a signal-space technique to incorporate into the conventional DH-DR system that significantly improves the security performance of the conventional system. Note that both DF relays do not duplicate the data and instead forward different symbols to the destination because of the signal space technique. We analyze the proposed system for the secrecy outage probability and the intercept probability. The results confirm the 4 dB improvement in secrecy outage probability. Moreover, we assess the secrecy performance of the proposed system and compare it with the conventional system to show the superiority of the proposed system over the conventional one. Furthermore, we use Monte Carlo simulations to evaluate the proposed system's performance.

DOI
10.1109/ccwc54503.2022.9720820

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We examine the physical-layer security performance of a conventional dual-hop dual-relay (DH-DR) network, where two decode-and-forward relays are used to facilitate the communication from the source to the destination without a direct link between the source and the destination. The conventional DH-DR system employs an ordinary modulation scheme such as a 4-QAM modulation. Thus, we propose a signal-space technique to incorporate into the conventional DH-DR system that significantly improves the security performance of the conventional system. Note that both DF relays do not duplicate the data and instead forward different symbols to the destination because of the signal space technique. We analyze the proposed system for the secrecy outage probability and the intercept probability. The results confirm the 4 dB improvement in secrecy outage probability. Moreover, we assess the secrecy performance of the proposed system and compare it with the conventional system to show the superiority of the proposed system over the conventional one. Furthermore, we use Monte Carlo simulations to evaluate the proposed system's performance.
In this paper, signal space diversity (SSD) is proposed to integrate into a dual-hop cooperative relay system to enhance its secrecy performance. A complete investigation on secrecy performance of the cooperative system with a decode- and-forward (DF) relay using SSD over Rayleigh fading channels is carried out in this paper. Due to SSD, both source and intermediate relay cooperate to transmit two different symbols to the destination, thus its mutual information and secrecy capacity is higher than the conventional dual-hop cooperative relay system. Therefore, secrecy analysis of SSD-based cooperative relay system is completely different than conventional dual-hop cooperative relay system. Moreover, secrecy outage probability of the SSD-based cooperative system is compared with the conventional dual-hop cooperative system and it is confirmed that SSD-based cooperative system outperforms the conventional cooperative system. In this paper, the closed-form expressions for the secrecy outage probability, and intercept probability of the SSD-based cooperative system are derived and validated through Monte Carlo simulations. Furthermore, the impact of imperfect channel estimation on the secrecy performance of the SSD-based cooperative relay system is investigated.
This paper investigates the physical layer security of a two-way cooperative relay system, where two sources communicate with each other directly as well as via an intermediate decode-and-forward (DF) relay. This paper proposes to incorporate modulation diversity into the two-way cooperative relay system to improve its secrecy performance. In this paper, the physical layer security of the two-way cooperative relay system with modulation diversity is explored in detail over Rayleigh fading channels using mathematical analysis and computer simulations. When the modulation diversity is integrated into two sources and the intermediate DF relay, both source and relay cooperatively transmit different symbols, thus increasing the spectral efficiency of the system by exchanging four symbols in three time slots compared to the conventional two-way cooperative relay system which exchanges two symbols in three time slots. Hence, the mutual information of the proposed system is higher than the conventional system that makes the analysis of the proposed system is entirely different than the conventional system. This paper presents the mathematical analysis for the secrecy outage probability, the probability of non-zero secrecy capacity, and the intercept probability of the proposed system. Moreover, it carries out comprehensive computer simulations to validate the mathematical framework. Finally, the results confirm the significant improvement of the two-way cooperative relay system's secrecy performance by incorporating the proposed scheme compared to the conventional system.
This paper presents the integration of the signal interleaving technique, also known as modulation diversity, into dual-hop, multi-relay cooperative networks to increase physicallayer security (PLS). We investigate, for the first time, the use of interleaving in conjunction with many decode-and-forward (DF) relays to improve secrecy performance and provide a comprehensive analysis of key secrecy metrics. To maximize secrecy, the best relay is dynamically selected utilizing instantaneous channel conditions. The proposed technique increases mutual information and secrecy capacity compared to conventional networks by enabling both the source and selected relay for transmitting distinct signal points towards destination. Our analysis reveals that the proposed network's secrecy outage probability exhibits a10\mathbf{1 0}10-fold improvement over conventional systems. Moreover, the probabilities for non-zero secrecy capacity and the intercept are significantly enhanced, with up to1600\mathbf{1 6 0 0}1600-fold and900\mathbf{9 0 0}900-fold performance gains, respectively. These findings emphasize the capability of the proposed network to reinforce security in nextgeneration networks.
In this paper, the line-of sight and non line-of sight characteristics of a received signal are exploited to analyze the secrecy performance of the decode-and-forward scheme over Dual-Hop Asymmetric Fading Channels. In this scheme, the first hop from a source to relays is subject to Rician fading, whereas the second hop from relays to a destination experience Nakagami-m fading. The best relay is chosen to help the source to transmit data signals to the destination based on achievable secrecy rate (ASR) following criterions as: best source-relay, best relay-destination and best end-to-end. The secrecy performance is exactly evaluated by the secrecy outage probability of the ASR. The Monte-Carlo results are presented to verify the theoretical analysis.
This study proposes the approach of using signal space diversity (SSD) to enhance physical layer security (PLS) for cooperative two-way networks with many decode-and-forward (DF) relays. We evaluate a range of secrecy performance metrics to establish the advantages of the proposed approach against conventional architectures. By rotating and interleaving symbols prior to transmission, SSD increases mutual information and secrecy capacity, distinguishing the analysis approach from that of traditional networks. To further boost security, a best relay selection algorithm is implemented, identifying the optimal relay in data exchange between sources. Numerical findings proves the dramatic improvement in secrecy performance of the proposed network. Moreover, the non-zero secrecy capacity probability achieves a2 dB\mathbf{2} \mathbf{~ d B}2 dBgain, and the probability of intercept performance improves by 600 times with multiple relays, strengthening the PLS for the proposed network. These results underscore the capabilities of the proposed network to reinforce security in nextgeneration networks.
In the last decade, multi-hop cooperation has evolved bringing several advantages including coverage improvement, more reliability of wireless links, and power consumption reduction. Still, its application has raised several challenges, such as the need for secure transmission at each hop, algorithms to perform relay selection and the accurate models to facilitate performance analysis. This paper addresses the problem of physical layer (PHY) security in a multi-hop wireless cooperative network, where communication at each hop is assisted by multiple relays forming a cluster, each cluster being surrounded by multiple eavesdroppers which together may tap transmissions from both the source and the relays. The main focus of the study is on analyzing the benefits of various relay selection schemes for protecting the source-destination transmission against the eavesdroppers, which can collude and combine information via diversity combining techniques. To be specific, four relay selection schemes, which differ in the way they employ available measures link quality, are considered to deliver the source information to the destination via a decode-and-forward (DF) strategy. To evaluate the security performance of the multi-hop cooperative link in the presence of colluding eavesdroppers, we derive novel closed-form analytical expressions for the secrecy outage probability (SOP) with consideration of special cases of practical interest.