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Performance Evaluation

Secrecy performance of multi-user multi-hop cluster-based network with joint relay and jammer selection under imperfect channel state information

Chu Tien Dung, Tran Manh Hoang, Nguyen Nhu Thang, Minh Hoang Quang Tran, Phuong T. Tran

Published Feb 11, 2021• 5 citations
Publisher
DOI
10.1016/j.peva.2021.102193

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Impact of hardware impairments on secrecy performances of wireless relay systems

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Security is one of the most important issues in wireless communication.Because using wireless channels entails broadcasting data transmissions, malicious nodes can eavesdrop on wireless transmission, which leads to insecure data transmission.Traditional security methods are based on cryptography.Recently, physical-layer security (PLS) has gained much attention as an efficient method of obtaining secure information without using cryptography.PLS protocols employ the physical characteristics of wireless channels such as channel state information (CSI) and the distances between connection links in order to enhance secrecy performances in wireless systems.To enhance secrecy performances, the dual-hop/multi-hop relay protocols can be used efficiently.However, according to my best knowledge, there are few published works considering the impact of hardware impairments on secrecy performances for the wireless relaying networks.Hence, this dissertation examines the diversity-based relay protocols for wireless communication networks in order to improve secrecy performances in presence of hardware imperfections.First, new dual-hop and multi-hop cooperative relaying schemes with various relay selection methods are proposed in order to obtain improved secrecy performance compared with the existing schemes.Second, new joint relay and jammer selection protocols are also considered in order to improve the channel capacity for data links while reducing the channel capacity of eavesdropping links.Finally, this dissertation proposes harvest-to-transmit and harvest-to-jam protocols, where the relay and jammer nodes harvest energy from the radio frequency signal for use in the data transmission and the jamming process, respectively.To evaluate the performance of the proposed protocols over fading channels, this dissertation focuses on deriving the closed-form expressions for secrecy performances.Then, the derived expressions are verified by Monte Carlo simulations, which also present the advantages of the proposed protocols.

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In this paper, the security of two-way relay communications in the presence of a passive eavesdropper is investigated. Two users communicate via a relay that depends solely on energy harvesting to amplify and forward the received signals. Time switching is employed at the relay to harvest energy and obtain user information. A friendly jammer is utilized to hinder the eavesdropping from wiretapping the information signal. The eavesdropper employs maximal ratio combining and selection combining to improve the signal-to-noise ratio of the wiretapped signals. Geometric programming (GP) is used to maximize the secrecy capacity of the system by jointly optimizing the time switching ratio of the relay and transmit power of the two users and jammer. The impact of imperfect channel state information at the eavesdropper for the links between the eavesdropper and the other nodes is determined. Further, the secrecy capacity when the jamming signal is not perfectly cancelled at the relay is examined. The secrecy capacity is shown to be greater with a jammer compared to the case without a jammer. The effect of the relay, jammer, and eavesdropper locations on the secrecy capacity is also studied. It is shown that the secrecy capacity is greatest when the relay is at the midpoint between the users. The closer the jammer is to the eavesdropper, the higher the secrecy capacity as the shorter distance decreases the signal-to-noise ratio of the jammer.

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In this paper, we consider a two-hop relay wireless network with one source, one destination, one eavesdropper and multiple half-duplex (HD) relays each having a finite buffer. We assume two cases of the eavesdropper's channel state information (CSI), i.e., the perfect CSI case where the instantaneous CSI of the eavesdropper channels are available, and the partial CSI case where only the average CSI of the eavesdropper channels are available. Cooperative jamming schemes are proposed for both eavesdropper's CSI cases, where two relays are selected in each hop, one is selected as a message relay and another as a jammer to transmit jamming signals to degrade the eavesdropper channel. The security performance in terms of the secrecy outage probability (SOP) is analyzed by simulation. We also make comparison between our proposed cooperative jamming schemes with the random jammer selection scheme. Results show that the proposed cooperative jamming scheme outperforms the random jammer selection scheme and the joint consideration of the buffer-aided relay selection and jamming can achieve better security performance.

International Symposium on Computing and Networking•Nov 1, 2017•7 citations
Security is one of the most important issues in wireless communication.Because using wireless channels entails broadcasting data transmissions, malicious nodes can eavesdrop on wireless transmission, which leads to insecure data transmission.Traditional security methods are based on cryptography.Recently, physical-layer security (PLS) has gained much attention as an efficient method of obtaining secure information without using cryptography.PLS protocols employ the physical characteristics of wireless channels such as channel state information (CSI) and the distances between connection links in order to enhance secrecy performances in wireless systems.To enhance secrecy performances, the dual-hop/multi-hop relay protocols can be used efficiently.However, according to my best knowledge, there are few published works considering the impact of hardware impairments on secrecy performances for the wireless relaying networks.Hence, this dissertation examines the diversity-based relay protocols for wireless communication networks in order to improve secrecy performances in presence of hardware imperfections.First, new dual-hop and multi-hop cooperative relaying schemes with various relay selection methods are proposed in order to obtain improved secrecy performance compared with the existing schemes.Second, new joint relay and jammer selection protocols are also considered in order to improve the channel capacity for data links while reducing the channel capacity of eavesdropping links.Finally, this dissertation proposes harvest-to-transmit and harvest-to-jam protocols, where the relay and jammer nodes harvest energy from the radio frequency signal for use in the data transmission and the jamming process, respectively.To evaluate the performance of the proposed protocols over fading channels, this dissertation focuses on deriving the closed-form expressions for secrecy performances.Then, the derived expressions are verified by Monte Carlo simulations, which also present the advantages of the proposed protocols.
In this paper, the security of two-way relay communications in the presence of a passive eavesdropper is investigated. Two users communicate via a relay that depends solely on energy harvesting to amplify and forward the received signals. Time switching is employed at the relay to harvest energy and obtain user information. A friendly jammer is utilized to hinder the eavesdropping from wiretapping the information signal. The eavesdropper employs maximal ratio combining and selection combining to improve the signal-to-noise ratio of the wiretapped signals. Geometric programming (GP) is used to maximize the secrecy capacity of the system by jointly optimizing the time switching ratio of the relay and transmit power of the two users and jammer. The impact of imperfect channel state information at the eavesdropper for the links between the eavesdropper and the other nodes is determined. Further, the secrecy capacity when the jamming signal is not perfectly cancelled at the relay is examined. The secrecy capacity is shown to be greater with a jammer compared to the case without a jammer. The effect of the relay, jammer, and eavesdropper locations on the secrecy capacity is also studied. It is shown that the secrecy capacity is greatest when the relay is at the midpoint between the users. The closer the jammer is to the eavesdropper, the higher the secrecy capacity as the shorter distance decreases the signal-to-noise ratio of the jammer.
In this paper, we consider a two-hop relay wireless network with one source, one destination, one eavesdropper and multiple half-duplex (HD) relays each having a finite buffer. We assume two cases of the eavesdropper's channel state information (CSI), i.e., the perfect CSI case where the instantaneous CSI of the eavesdropper channels are available, and the partial CSI case where only the average CSI of the eavesdropper channels are available. Cooperative jamming schemes are proposed for both eavesdropper's CSI cases, where two relays are selected in each hop, one is selected as a message relay and another as a jammer to transmit jamming signals to degrade the eavesdropper channel. The security performance in terms of the secrecy outage probability (SOP) is analyzed by simulation. We also make comparison between our proposed cooperative jamming schemes with the random jammer selection scheme. Results show that the proposed cooperative jamming scheme outperforms the random jammer selection scheme and the joint consideration of the buffer-aided relay selection and jamming can achieve better security performance.