Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

International Conference on Communications and Networking in China (ChinaCom)

Cooperative beamforming and jammer selection strategies for two-hop secure communication

Hao Jiang Deng, Hui‐Ming Wang, Chaowen Liu, Tong-Xing Zheng, Wenjie Wang

Published Aug 1, 2015• 1 citation
Publisher

Abstract

In this paper, we propose a novel scheme to enhance the security of a single source-destination cooperative network with multiple helpers and one eavesdropper, where a helper operates as a jammer and the others use amplify-and-forward (AF) protocol to deliver a weighted version of the received signal. Since the instantaneous channel state information (CSI) of the eavesdropper is not available, we hope to achieve the maximum signal-to-noise ratio (SNR) and guarantee that the jamming signal is cancelled out at the destination. The weights of the relay can be obtained by just solving a semidefinite programming (SDP) without bisection search. We provide two jammer selection strategies for two cases, i.e., with or without knowledge of the eavesdropper's position. Simulation results confirm a great improvement of the security in the considered network.

DOI
10.1109/chinacom.2015.7497904

Related papers

An Effective Secure Transmission Scheme for AF Relay Networks with Two-Hop Information Leakage

Meilu Lin, Jianhua Ge, Yang Ye

In this letter, we propose a novel scheme to improve physical layer security for amplify-and-forward (AF) relay networks with two-hop information leakage. Unlike traditional joint cooperative beamforming (CB) and cooperative jamming (CJ) design, where mere artificial noise (AN) is exploited by the jammers to degrade eavesdroppers' channels, in our proposed scheme, the jammers send AN along with the confidential signal to simultaneously confuse the eavesdroppers and enhance the quality of received signals at the destination. In particular, the CB vectors and AN covariance matrix are jointly optimized for the relays and jammers under individual power constraints. By decoupling this resultant design problem, suboptimal solutions are obtained using the semidefinite relaxation technique. Simulation results are also provided to demonstrate that the proposed scheme has an obvious advantage in enhancing the secrecy rate.

IEEE Communications Letters•Jul 2, 2013•22 citations

Cooperative Jamming in a Two-Hop Relay Wireless Network with Buffer-Aided Relays

Kenta Sasaki, Xuening Liao, Xiaohong Jiang

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

Strategy of Relay Selection and Cooperative Jammer Beamforming in Physical Layer Security

Ming Zhang, Yong Shang, Yaohuan Zhao

In this paper, a novel strategy of relay selection and cooperative jammer beamforming is proposed. The proposed scheme selects one node from the intermediate nodes as relay and the rest nodes as friendly jammers. The relay operates in amplify-and-forward (AF) strategy. Jammer weights are derived to null the jamming signals at the destination and relay node and maximize the jamming signal at the eavesdropper. Furthermore, a closed-form optimal solution of power allocation between the selected relay and cooperative jammers is derived. Numerical simulation results show that the proposed scheme can outperform the conventional schemes at the same power consumption.

IEEE Vehicular Technology Conference•Nov 1, 2020•6 citations

Improving Physical Layer Security of AF Relay Networks via Beam-Forming and Jamming

Abdelhamid Salem, Khairi Ashour Hamdi

In this paper the cooperation of beam-forming and artificial noise (AN) in two-hop amplify-and- forward (AF) relaying system is proposed to enhance the security. we consider a half duplex AF relaying network with a multi-antenna source node and a destination in the presence of a passive eavesdropper.Since channel state information (CSI) of the eavesdropper is unknown, the AN transmitted by the source in the first phase and by the relays in the second phase is in all directions except the legitimate node one. As such two scenarios are considered here,: i) when all the relays amplify and forward the information source signal ii) when only the best relay is selected to amplify and forward the information source signal. The beam-former weights and the power allocation are obtained by solving an optimization problem. Results reveal that the proposed system can provide considerable improvements in terms of secrecy rate. It is also found that increasing the AN power, relative to the information signal power, will further improve the secrecy rate.

IEEE Vehicular Technology Conference•Sep 1, 2016•7 citations

Destination Assisted Jamming and Beamforming for Improving the Security of AF Relay Systems

Nian Ouyang, Xueqin Jiang, Enjian Bai +1 more

In this paper, we propose a destination-assisted jamming and beamforming (DAJB) scheme for physical layer security in a one-way cooperative amplify-and-forward (AF) relay communication system. The system model consists of one source, one destination, one eavesdropper, and N relay nodes, with the individual power constraint of each relay node and the destination-assisted jamming node as well as unknown instantaneous channel state information (CSI) of the eavesdropper. Due to the half-duplex constraint of the relay nodes, there are two phases in our proposed DAJB scheme. In the first phase, the source node broadcasts information signal and all N relay nodes listen simultaneously. In the meantime, the destination node transmits the jamming signal to confuse the potential eavesdropper. In the second phase, all N relay nodes amplify and forward the received signals, covered by the artificial noise (AN), to the destination using the distributed beamforming technology. The optimal beamformer weights and power allocation are obtained by solving the second-order convex cone programming (SOCP) together with a linear programming (LP) problem. Furthermore, the performance of the DAJB scheme is analyzed in terms of the achievable secrecy rate. Compared with the scheme that selects a relay node as the jammer, we obtain larger power gain to achieve higher secrecy rates. Finally, the simulation results verify that the DAJB scheme greatly improves the secrecy rate of a one-way cooperative AF relay communication system.

IEEE Access•Jan 1, 2017•18 citations

Joint Cooperative Beamforming and Jamming to Secure AF Relay Systems With Individual Power Constraint and No Eavesdropper's CSI

Hui‐Ming Wang, Miao Luo, Xiang‐Gen Xia +1 more

Cooperative beamforming and jamming are two efficient schemes to improve the physical-layer security of a wireless relay system in the presence of passive eavesdroppers. However, in most works these two techniques are adopted separately. In this letter, we propose a joint cooperative beamforming and jamming scheme to enhance the security of a cooperative relay network, where a part of intermediate nodes adopt distributed beamforming while others jam the eavesdropper, simultaneously. Since the instantaneous channel state information (CSI) of the eavesdropper may not be known, we propose a cooperative artificial noise transmission based secrecy strategy, subjected to the individual power constraint of each node. The beamformer weights and power allocation can be obtained by solving a second-order convex cone programming (SOCP) together with a linear programming problem. Simulations show the joint scheme greatly improves the security.

IEEE Signal Processing Letters•Nov 14, 2012•194 citations
In this paper, we propose a novel scheme to enhance the security of a single source-destination cooperative network with multiple helpers and one eavesdropper, where a helper operates as a jammer and the others use amplify-and-forward (AF) protocol to deliver a weighted version of the received signal. Since the instantaneous channel state information (CSI) of the eavesdropper is not available, we hope to achieve the maximum signal-to-noise ratio (SNR) and guarantee that the jamming signal is cancelled out at the destination. The weights of the relay can be obtained by just solving a semidefinite programming (SDP) without bisection search. We provide two jammer selection strategies for two cases, i.e., with or without knowledge of the eavesdropper's position. Simulation results confirm a great improvement of the security in the considered network.
In this letter, we propose a novel scheme to improve physical layer security for amplify-and-forward (AF) relay networks with two-hop information leakage. Unlike traditional joint cooperative beamforming (CB) and cooperative jamming (CJ) design, where mere artificial noise (AN) is exploited by the jammers to degrade eavesdroppers' channels, in our proposed scheme, the jammers send AN along with the confidential signal to simultaneously confuse the eavesdroppers and enhance the quality of received signals at the destination. In particular, the CB vectors and AN covariance matrix are jointly optimized for the relays and jammers under individual power constraints. By decoupling this resultant design problem, suboptimal solutions are obtained using the semidefinite relaxation technique. Simulation results are also provided to demonstrate that the proposed scheme has an obvious advantage in enhancing the secrecy rate.
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.
In this paper, a novel strategy of relay selection and cooperative jammer beamforming is proposed. The proposed scheme selects one node from the intermediate nodes as relay and the rest nodes as friendly jammers. The relay operates in amplify-and-forward (AF) strategy. Jammer weights are derived to null the jamming signals at the destination and relay node and maximize the jamming signal at the eavesdropper. Furthermore, a closed-form optimal solution of power allocation between the selected relay and cooperative jammers is derived. Numerical simulation results show that the proposed scheme can outperform the conventional schemes at the same power consumption.
In this paper the cooperation of beam-forming and artificial noise (AN) in two-hop amplify-and- forward (AF) relaying system is proposed to enhance the security. we consider a half duplex AF relaying network with a multi-antenna source node and a destination in the presence of a passive eavesdropper.Since channel state information (CSI) of the eavesdropper is unknown, the AN transmitted by the source in the first phase and by the relays in the second phase is in all directions except the legitimate node one. As such two scenarios are considered here,: i) when all the relays amplify and forward the information source signal ii) when only the best relay is selected to amplify and forward the information source signal. The beam-former weights and the power allocation are obtained by solving an optimization problem. Results reveal that the proposed system can provide considerable improvements in terms of secrecy rate. It is also found that increasing the AN power, relative to the information signal power, will further improve the secrecy rate.
In this paper, we propose a destination-assisted jamming and beamforming (DAJB) scheme for physical layer security in a one-way cooperative amplify-and-forward (AF) relay communication system. The system model consists of one source, one destination, one eavesdropper, and N relay nodes, with the individual power constraint of each relay node and the destination-assisted jamming node as well as unknown instantaneous channel state information (CSI) of the eavesdropper. Due to the half-duplex constraint of the relay nodes, there are two phases in our proposed DAJB scheme. In the first phase, the source node broadcasts information signal and all N relay nodes listen simultaneously. In the meantime, the destination node transmits the jamming signal to confuse the potential eavesdropper. In the second phase, all N relay nodes amplify and forward the received signals, covered by the artificial noise (AN), to the destination using the distributed beamforming technology. The optimal beamformer weights and power allocation are obtained by solving the second-order convex cone programming (SOCP) together with a linear programming (LP) problem. Furthermore, the performance of the DAJB scheme is analyzed in terms of the achievable secrecy rate. Compared with the scheme that selects a relay node as the jammer, we obtain larger power gain to achieve higher secrecy rates. Finally, the simulation results verify that the DAJB scheme greatly improves the secrecy rate of a one-way cooperative AF relay communication system.
Cooperative beamforming and jamming are two efficient schemes to improve the physical-layer security of a wireless relay system in the presence of passive eavesdroppers. However, in most works these two techniques are adopted separately. In this letter, we propose a joint cooperative beamforming and jamming scheme to enhance the security of a cooperative relay network, where a part of intermediate nodes adopt distributed beamforming while others jam the eavesdropper, simultaneously. Since the instantaneous channel state information (CSI) of the eavesdropper may not be known, we propose a cooperative artificial noise transmission based secrecy strategy, subjected to the individual power constraint of each node. The beamformer weights and power allocation can be obtained by solving a second-order convex cone programming (SOCP) together with a linear programming problem. Simulations show the joint scheme greatly improves the security.