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Secrecy rate optimization for two-hop relay system with energy harvesting based on cooperative jamming

雷维嘉, 谢显中, 江雪, 左莉杰

Published Jan 1, 2015• 0 citations
Publisher
DOI
10.3969/j.issn.1001-506x.2015.12.26

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Secrecy rate optimization for two-hop relay system with energy harvesting based on cooperative jamming

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A two-hop relay-eavesdropper channel model with one transmitter,one relay,one receiver and one eavesdropper is considered,where the nodes harvest energy and the save-then-transmit protocol is employed.That is,the nodes harvest energy first,which is then used to transmit the data.The relay is operated as an amplify-and-forward relay,and the destination sends an intended jamming noise to protect information,which is referred as cooperative jamming.First,the condition that ensures the promotion of secrecy capacity is derived.Second,an optimization algorithm to maximize secrecy rate Rsis given,which is based on the optimization of the energy saving time ratioρand the jamming power allocation scaling factorα.Simulation results show that the algorithm has a high convergence speed,and can effectively improve secrecy rate.

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A two-hop relay-eavesdropper channel model with one transmitter,one relay,one receiver and one eavesdropper is considered,where the nodes harvest energy and the save-then-transmit protocol is employed.That is,the nodes harvest energy first,which is then used to transmit the data.The relay is operated as an amplify-and-forward relay,and the destination sends an intended jamming noise to protect information,which is referred as cooperative jamming.First,the condition that ensures the promotion of secrecy capacity is derived.Second,an optimization algorithm to maximize secrecy rate Rsis given,which is based on the optimization of the energy saving time ratioρand the jamming power allocation scaling factorα.Simulation results show that the algorithm has a high convergence speed,and can effectively improve secrecy rate.
In this article, we investigated the secrecy performance of a three-hop relay network system with Power Splitting (PS) and Energy Harvesting (EH). In the presence of one eavesdropper, a signal is transferred from source to destination with the help of a relay. The source signal transmits in full-duplex (FD) mood, jamming the relay transfer signals to the destination. The relay and source employ Time Switching (TS) and Energy Harvesting (EH) techniques to obtain the power from the power beacon. In this study, we compared the Secrecy Rate of two Cooperative Schemes, Amplify and Forward (AF) and Decode and Forward (DF), for both designed systems with the established EH and PS system. The Secrecy Rate was improved by 50.5% in the AF scheme and by 44.2% in the DF scheme between the relay and eavesdropper at 40 m apart for the proposed system in EH and PS. This simulation was performed using the Monto Carlo method in MATLAB.
To guarantee secure information transmission within two sources, a full-duplex (FD) relay jamming scheme for two-way energy harvesting (EH) cooperative networks is proposed, in which the relay can achieve simultaneous information reception and jamming transmission. The EH relay node scavenges energy from two source signals, and then, uses the harvested energy for information relaying and jamming transmission by the power splitting (PS) protocol. Considering multiple eavesdroppers, the non-convex optimization for maximizing the smaller bidirectional secrecy rates is formulated by jointly optimizing the power allocation and PS factor. Furthermore, an iterative algorithm based on successive convex approximation and alternate search method is proposed to solve this non-convexity. Simulation results verify the proposed iterative algorithm and show that the proposed jamming scheme can achieve substantial performance gain than other conventional schemes.