Bidirectional AF Relaying With Underlay Spectrum Sharing in Cognitive Radio Networks

Vahidian, Saeed; Soleimani‐Nasab, Ehsan; Aı̈ssa, Sonia; Ahmadian-Attari, Mahmoud

doi:10.1109/tvt.2016.2578180

Cited by 26 publications

(18 citation statements)

References 28 publications

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“…Finally, in Case III, while the same CSI assumption as in Case II are made, an optimal relay selection scheme is implemented, whereby the relay that achieves the maximum secrecy rate is chosen for retransmission. Compared to conventional relay selection approaches [47][48][49][50][51] where only the CSI of the legitimate S − Rm and Rm − D links are required, in the optimal IR scheme, knowledge of the channel gain magnitudes of eavesdroppers channels is also needed for maximizing the secrecy rate through the use of an error-free feedback channel between E and D [14,16,52,53]). The assumption of known eavesdropper CSI can be justified when the eavesdropper is seen as another legitimate user waiting to be served by the source while the latter is serving the destination securely.…”

Section: Security-reliability Analysis Of Ir Schemesmentioning

confidence: 99%

On the Security Analysis of a Cooperative Incremental Relaying Protocol in the Presence of an Active Eavesdropper

2019

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Physical layer security offers an efficient means to decrease the risk of confidential information leakage through wiretap links. In this paper, we address the physical-layer security in a cooperative wireless subnetwork that includes a source-destination pair and multiple relays, exchanging information in the presence of a malevolent eavesdropper. Specifically, the eavesdropper is active in the network and transmits artificial noise (AN) with a multiple-antenna transmitter to confound both the relays and the destination. We first analyse the secrecy capacity of the direct source-to-destination transmission in terms of intercept probability (IP) and secrecy outage probability (SOP). A decode-andforward incremental relaying (IR) protocol is then introduced to improve reliability and security of communications in the presence of the active eavesdropper. Within this context, and depending on the availability of channel state information, three different schemes (one optimal and two sub-optimal) are proposed to select a trusted relay to improve the achievable secrecy rate. For each one of these schemes, and for both selection and maximum ratio combining at the destination and eavesdropper, we derive new and exact closed-form expressions for the IP and SOP. Our analysis and simulation results demonstrate the superior performance of the proposed IR-based selection schemes for secure communication. They also confirm the existence of a floor phenomenon for the SOP in the absence of AN.Artificial noise, incremental relaying, network, physical-layer security.S. Vahidian is with the

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Section: Security-reliability Analysis Of Ir Schemesmentioning

confidence: 99%

On the Security Analysis of a Cooperative Incremental Relaying Protocol in the Presence of an Active Eavesdropper

2019

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“…the third constraint in (26) is now in quadratic convex form since (J T m + J m + 2I m ) is a symmetric positive semi-definite matrix. Note that the optimization problem is still the same (since x T q J m x q ≤ and J T m = J −m then x T q J T m x q ≤ also holds and from the first constraint x T q I m x q ≤ p).…”

Section: Pilot Sequence Designmentioning

confidence: 99%

“…Step 2: Update the current design of X and Y by solving cyclic optimization problem (26) and (25) µ times (or until convergence).…”

Section: Algorithm 1 Cyclic Algorithm For Constrained Pilot Sequence mentioning

confidence: 99%

“…Most modern wireless systems acquire the CSI with the assistance of pilot signals (a.k.a. training sequences) that are inserted within the transmit signals periodically [26], [27]. In such scenarios, the transmitter sends training sequences -known to the receiver -enabling the receiver to perform channel estimation on the basis of the received training symbols.…”

Section: Introductionmentioning

confidence: 99%

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ComSens: Exploiting pilot diversity for pervasive integration of communication and sensing in MIMO-TDD-Frameworks

Mousaei

Soltanalian

Smida

2017

MILCOM 2017 - 2017 IEEE Military Communications Conference (MILCOM)

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Abstract-In this paper, we propose a fully-integrated radar and communication system -named ComSens. We utilize two different pilot sequences (one for uplink and one for downlink) with the condition that they must be uncorrelated to each other. Within such a framework, the signal received from end-user and the backscattered signal from the desired objects have uncorrelated pilots. Thus, the base-station is able to distinguish data signal from user and back-scattered signal from object. We assume a time division duplex (TDD) framework. The pilot sequences are designed for MIMO channels. We evaluate channel MSE as a figure of merit for communication system. We also show that the designed pilots are uncorrelated for a range of time lags. Moreover, designed uplink pilot has negligable autocorrelation for a range of time lags leading to an impulse-like autocorrelation for radar sensing.

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“…Unlike [29] which has focused on the security of the repair links using concatenated codes, the current paper presents simultaneous security and privacy of the data storage nodes by only using RLF codes. References [30] and [31] have studied the problem of security in the presence of overhearing interference in cooperative communications. Further [32], [33] studied the same problem on multi-tier networks.…”

Section: Related Workmentioning

confidence: 99%

Secure and private cloud storage systems with random linear fountain codes

Kiskani

Sadjadpour

2017

2017 IEEE SmartWorld, Ubiquitous Intelligence &Amp; Computing, Advanced &Amp; Trusted Computed, Scalable Computing &Amp; Commun

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An information theoretic approach to security and privacy called Secure And Private Information Retrieval (SAPIR) is introduced. SAPIR is applied to distributed data storage systems. In this approach, random combinations of all contents are stored across the network. Our coding approach is based on Random Linear Fountain (RLF) codes. To retrieve a content, a group of servers collaborate with each other to form a Reconstruction Group (RG). SAPIR achieves asymptotic perfect secrecy if at least one of the servers within an RG is not compromised. Further, a Private Information Retrieval (PIR) scheme based on random queries is proposed. The PIR approach ensures the users privately download their desired contents without the servers knowing about the requested contents indices. The proposed scheme is adaptive and can provide privacy against a significant number of colluding servers.

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Bidirectional AF Relaying With Underlay Spectrum Sharing in Cognitive Radio Networks

Cited by 26 publications

References 28 publications

On the Security Analysis of a Cooperative Incremental Relaying Protocol in the Presence of an Active Eavesdropper

On the Security Analysis of a Cooperative Incremental Relaying Protocol in the Presence of an Active Eavesdropper

ComSens: Exploiting pilot diversity for pervasive integration of communication and sensing in MIMO-TDD-Frameworks

Secure and private cloud storage systems with random linear fountain codes

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