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Transactions on Emerging Telecommunications Technologies

Improving secrecy for multi‐relay multi‐eavesdropper wireless systems through relay selection

Xiaojin Ding, T. Song, Yulong Zou, Xianhua Chen

Published Apr 5, 2016• 6 citations
Publisher

Abstract

Abstract In this paper, we consider a cooperative relay network consisting of a source, a destination and multiple decode‐and‐forward relays in the presence of multiple eavesdroppers, which intend to tap confidential messages transmitted by both the source and relays. We propose both the so‐called secrecy maximisation oriented relay selection (SMORS) and multi‐relay oriented relay selection (MRORS) schemes to improve the physical layer security of wireless communications. In the SMORS scheme, a single relay with the maximal secrecy rate is selected among all the decode‐and‐forward relays to forward the source signal. By contrast, in the MRORS scheme, the relays that succeed in decoding the source signal will be employed to simultaneously forward their decoded signals to the destination. We analyse the intercept probability of the SMORS and MRORS schemes as well as the traditional max–min relay selection scheme. It is shown that the proposed MRORS scheme outperforms the SMORS and max–min relay selection schemes in terms of the intercept probability. Additionally, it is shown that with an increasing number of eavesdroppers, the intercept performance of wireless communications degrades, which can be well addressed using the SMORS and MRORS schemes through increasing the number of relays. By contrast, increasing the number of relays has little impact on the intercept probability for the conventional max–min relay selection scheme Transactions on Emerging Telecommunications Technologies. Copyright © 2016 John Wiley & Sons, Ltd.

DOI
10.1002/ett.3040

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Abstract In this paper, we consider a cooperative relay network consisting of a source, a destination and multiple decode‐and‐forward relays in the presence of multiple eavesdroppers, which intend to tap confidential messages transmitted by both the source and relays. We propose both the so‐called secrecy maximisation oriented relay selection (SMORS) and multi‐relay oriented relay selection (MRORS) schemes to improve the physical layer security of wireless communications. In the SMORS scheme, a single relay with the maximal secrecy rate is selected among all the decode‐and‐forward relays to forward the source signal. By contrast, in the MRORS scheme, the relays that succeed in decoding the source signal will be employed to simultaneously forward their decoded signals to the destination. We analyse the intercept probability of the SMORS and MRORS schemes as well as the traditional max–min relay selection scheme. It is shown that the proposed MRORS scheme outperforms the SMORS and max–min relay selection schemes in terms of the intercept probability. Additionally, it is shown that with an increasing number of eavesdroppers, the intercept performance of wireless communications degrades, which can be well addressed using the SMORS and MRORS schemes through increasing the number of relays. By contrast, increasing the number of relays has little impact on the intercept probability for the conventional max–min relay selection scheme Transactions on Emerging Telecommunications Technologies. Copyright © 2016 John Wiley & Sons, Ltd.
In this paper, we consider a cooperative relay network consisting of a source, a destination, and multiple decode-and-forward (DF) relays in the presence of multiple eavesdroppers, which intend to tap confidential messages transmitted by both the source and the relays. We propose a so-called secrecy maximization oriented relay selection (SMORS) scheme to improve the physical-layer security of wireless communications. In the SMORS scheme, a relay with the maximal secrecy rate is selected among all the DF relays to forward the source signal. We analyze the intercept probability of the proposed SMORS scheme as well as the traditional max-min relay selection scheme. Numerical results show that the proposed SMORS scheme outperforms the conventional max-min relay selection scheme in terms of the intercept probability. Additionally, it is shown that with an increasing number of eavesdroppers, the intercept performance of wireless communications degrades, which can be well addressed using the proposed SMORS scheme through increasing the number of relays. By contrast, increasing the number of relays has little impact on the intercept probability for the conventional max-min relay selection scheme, especially when the number of relays is sufficiently high (e.g., exceeding 20 relays).
ABSTRACT Physical layer security has recently attracted considerable attention in the context of information‐theoretic point of view. In this paper, we investigate relay selection schemes for security‐constrained half‐duplex cooperative wireless networks with multiple eavesdroppers, which have the ability to cooperate to overhear the source transmission. The proposed techniques select a trusted decode‐and‐forward relay to assist the source transmission and maximize the achievable secure rate for different eavesdropper policies (cooperation or not); for the two cases, we assume that the channel is always available. In addition, a jamming method that selects two relay nodes to create an intentional interference at both phases of the decode‐and‐forward protocol to confound the eavesdropper nodes is also considered. Both the source–destination and source–eavesdroppers links are taken into account in the proposed analysis. Secrecy rate and secrecy outage probability are the two performance metrics that are used to verify the effectiveness of the proposed schemes while asymptotic approximations of the secrecy outage probability are also derived. Simulation and analytical results demonstrate the performance improvement of the proposed schemes. Copyright © 2012 John Wiley & Sons, Ltd.
Privacy and security have an increasingly important role in wireless networks. A secure communication enables a legitimate destination to successfully retrieve information sent by a source, while it disables the eavesdropper (illegitimate destination) to interpret the intercepted information. Physical (PHY) layer security approaches for wireless communications can prevent eavesdropping without encryption. It exploits the physical characteristics of the wireless channel in order to transmit messages securely. They are typically feasible when the source-destination channel is better than the source-eavesdropper channel. Cooperative schemes are a means to improve the performance of secure wireless communications. We propose an improved relay selection scheme, based on source-eavesdropper channel SNR restriction, that will guarantee the best secrecy rate at the destination under QoS condition. Performance has been studied in terms of secrecy rate, outage probability and average error probability. Simulations shows that the proposed scheme outperforms in terms of the secrecy rate at the destination when compared to techniques in the literature.
To improve physical (PHY) layer security of a wireless relay system in the presence of an eavesdropper, a two-phase cooperative relaying scheme is investigated in this paper. In phase I, the source transmits confidential message, simultaneously, it cooperates with the friendly jammers and destination to create jamming signal at the eavesdropper without affecting the forwarding relay which is preselected. In phase II, the forwarding relay retransmits the decoded signal, meanwhile, the particular relay cooperates with the friendly jammers to create jamming signal at the eavesdropper without affecting the destination. We focus on the investigation of optimal power allocation for maximizing achievable secrecy rate subject to a total power constraint. Optimal relay selection and suboptimal relay selection schemes are also proposed. It is shown that as the number of relays increases, both secrecy rate and the performance of suboptimal relay selection scheme improve significantly. Numerical results are presented to validate the derived analytical results and compare them to existing work.
This paper considers the security of transmission in buffer-aided decode-and-forward cooperative wireless networks. An eavesdropper which can intercept the data transmission from both the source and relay nodes is considered to threaten the security of transmission. Finite size data buffers are assumed to be available at every relay in order to avoid having to select concurrently the best source-to-relay and relay-to-destination links. A new max-ratio relay selection policy is proposed to optimize the secrecy transmission by considering all the possible source-to-relay and relay-to-destination links and selecting the relay having the link which maximizes the signal to eavesdropper channel gain ratio. Two cases are considered in terms of knowledge of the eavesdropper channel strengths: exact and average gains, respectively. Closed-form expressions for the secrecy outage probability for both cases are obtained, which are verified by simulations. The proposed max-ratio relay selection scheme is shown to outperform one based on a max-min-ratio relay scheme.
We explore the physical-layer security for a multisource multi-relay wireless network in the presence of an eavesdropper, in which one of multiple sources is scheduled to send its message to a destination with the assistance of multiple decode-and-forward (DF) relays. One eavesdropper is considered at the receiver side, and assumed to be capable of overhearing the transmission from relays to destination. In this paper, the round-robin scheduling and the joint source-relay selection schemes are presented to improve the physical-layer security of the multi-source multi-relay system, and their closedform intercept probability expressions are derived over Rayleigh fadingchannels.Numericalresultsdemonstratethattheproposed joint source-relay selection scheme achieves a better performance than the traditional round-robin scheduling in terms of the intercept probability.