Joint Power Splitting and Secure Beamforming Design in the Wireless-Powered Untrusted Relay Networks

Zhao, Mingxiong; Wang, Xiangfeng; Zhang, Meng; Liu, Yuan; Fu, Hao

doi:10.1109/glocom.2015.7417347

Cited by 10 publications

(5 citation statements)

References 30 publications

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“…As described in Fig. 2, we consider a simple scenario where locations of PT, ST, PR and SR are (-5, 0), (0, 0), (5, -1) and (5,1) in coordinates, respectively. The distance unit is in meters and the path-loss exponent is 2.…”

Section: Simulation Resultsmentioning

confidence: 99%

Destination-Aided Wireless Power Transfer in Energy-Limited Cognitive Relay Systems

et al. 2016

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This paper considers an energy-limited cognitive relay network where a secondary transmitter (ST) assists to forward the traffic from a primary transmitter (PT) to a primary receiver (PR), in exchange for serving its own secondary receiver (SR) in the same frequency. The multiple-antenna ST is assumed to be energy-constrained and powered by both information flow from source (PT) and dedicated energy streams from destinations (PR and SR), which is called destination-aided wireless power transfer (DWPT) scheme. Then, the relay processing matrix, cognitive beamforming vector and power splitter are jointly designed to maximize the rate of secondary users under the energy causality constraint and the constraint that the demanded rate of primary users is satisfied. For the perfect channel information state (CSI) case, by adopting semi-definite relax (SDR) technique and Charnes-Cooper transformation, the global optimal solution is given. To reduce the complexity, matrix decomposition, zero forcing (ZF) scheme, and dual method are jointly employed to derive a suboptimal solution. For the imperfect CSI case, Sprocedure is used to transform the worst-case robust problem into a tractable semi-definite program (SDP). Simulation results reveal that our proposed DWPT scheme is greatly preferred for both perfect and imperfect CSI cases when ST is close to PR/SR. Index Terms-Wireless power transfer, cognitive relay networks, beamforming design, power splitting, semi-definite program.

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Section: Simulation Resultsmentioning

confidence: 99%

Destination-Aided Wireless Power Transfer in Energy-Limited Cognitive Relay Systems

et al. 2016

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“…Here we ignore the smaller terms of the form ∆h i ∆h j as they will be negligible compared to other terms. The received SNR at S 2 is thus given by (22) at the top of the next page. Using the triangle inequality, it follows that…”

Section: Secure Communication With Imperfect Csimentioning

confidence: 99%

On Secure Communication Using RF Energy Harvesting Two-Way Untrusted Relay

Gupta

Kalamkar

Banerjee

2017

GLOBECOM 2017 - 2017 IEEE Global Communications Conference

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We focus on a scenario where two wireless source nodes wish to exchange confidential information via an RF energy harvesting untrusted two-way relay. Despite its cooperation in forwarding the information, the relay is considered untrusted out of the concern that it might attempt to decode the confidential information that is being relayed. To discourage the eavesdropping intention of the relay, we use a friendly jammer. Under the total power constraint, to maximize the sum-secrecy rate, we allocate the power among the sources and the jammer optimally and calculate the optimal power splitting ratio to balance between the energy harvesting and the information processing at the relay. We further examine the effect of imperfect channel state information at both sources on the sum-secrecy rate. Numerical results highlight the role of the jammer in achieving the secure communication under channel estimation errors. We have shown that, as the channel estimation error on any of the channels increases, the power allocated to the jammer decreases to abate the interference caused to the confidential information reception due to the imperfect cancellation of jammer's signal.Index Terms-Energy harvesting, imperfect channel state information, physical layer security, two-way relay, untrusted relay S J R 1 2

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“…In [12], the authors studied secure one-way communication via a wireless energy harvesting untrusted relay and provided a lower bound expression for the ergodic secrecy rate. In [13], the secrecy rate of the wireless-powered relay networks was maximized by jointly designing power splitting and relay beamforming techniques.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, inspired by the work in [12], [13], we propose and analyze a new PLS scenario of wireless energy harvesting in two-way untrusted amplify-and-forward relaying in the presence of a FJ. Both the relay and FJ are powered by radio frequency (RF) signals from the two source nodes under a time switching (TS) policy.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the energy constraints of wireless networks, recent research have considered the use of wireless energy harvesting in PLS scenarios with relays and FJs [11]- [13]. To be specific, the authors in [11] employed a FJ with wireless energy harvesting to provide secure communication between a source and destination in the presence of an external eavesdropper.…”

Section: Introductionmentioning

confidence: 99%

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Secure Two-Way Communication via a Wireless Powered Untrusted Relay and Friendly Jammer

Mamaghani

Mohammadi

Yeoh

et al. 2017

GLOBECOM 2017 - 2017 IEEE Global Communications Conference

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In this paper, we propose a self-dependent two-way secure communication where two sources exchange confidential messages via a wireless powered untrusted amplify-and-forward (AF) relay and friendly jammer (FJ). By adopting the time switching (TS) architecture at the relay, the data transmission is accomplished in three phases: Phase I) Energy harvesting by the untrusted relay and the FJ through non-information transmissions from the sources, Phase II) Information transmission by the sources and jamming transmissions from the FJ to reduce information leakage to the untrusted relay; and Phase III) Forwarding the scaled version of the received signal from the untrusted relay to the sources. For the proposed system, we derive a new closed-form lower bound expression for the ergodic secrecy sum rate (ESSR). Numerical examples are provided to demonstrate the impacts of different system parameters such as energy harvesting time, transmit signal-to-noise ratio (SNR) and the relay/FJ location on the secrecy performance. The numerical results illustrate that the proposed network with friendly jamming (WFJ) outperforms traditional one-way communication and the two-way without friendly jamming (WoFJ) policy.

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Joint Power Splitting and Secure Beamforming Design in the Wireless-Powered Untrusted Relay Networks

Cited by 10 publications

References 30 publications

Destination-Aided Wireless Power Transfer in Energy-Limited Cognitive Relay Systems

Destination-Aided Wireless Power Transfer in Energy-Limited Cognitive Relay Systems

On Secure Communication Using RF Energy Harvesting Two-Way Untrusted Relay

Secure Two-Way Communication via a Wireless Powered Untrusted Relay and Friendly Jammer

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