On Outage of WPC System With Relay Selection Over Nakagami- $m$ Fading Channels

Yu, Han; Wang, Danyang; Pan, Gaofeng; Shi, Rui; Zhang, Jiliang; Chen, Yunfei

doi:10.1109/tvt.2017.2686981

Cited by 21 publications

(11 citation statements)

References 13 publications

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“…In this subsection, the best relay is selected by OSRL-WEH scheme. According to [5] and [25], the main adopted parameters are set as: First, we show the impact of the number of relay candidates on the OP of the considered system. Fig.…”

Section: A Osrl-weh Schemementioning

confidence: 99%

“…[23] and [24] investigated the outage performance of a CR system with opportunistic relays selection scheme, while considering that the source and relays are able to harvest energy, respectively. More specifically, various best RS schemes have been studied for common cooperative networks or the collaborative networks with wireless power transferring, under which the relay candidate with the optimal relay-destination link (ORDL), the optimal source-relay link (OSRL) or the optimal source-relay-destination link (OSRDL) is chosen as the relay, that is, ORDL, OSRL and OSRDL schemes [25]- [27].…”

Section: Introductionmentioning

confidence: 99%

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Relay Selections for Cooperative Underlay CR Systems With Energy Harvesting

Liu

Zhao

et al. 2019

IEEE Trans. Cogn. Commun. Netw.

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In this work, we consider a cooperative underlay cognitive radio system in which one secondary user (S) transmits its data to a secondary receiver with the assistance of multiple relays. In the considered underlay spectrum sharing scenario, the transmit power levers at S and forwarding relays are adjusted simultaneously according to a given threshold interference power that the primary user can tolerate. We also consider that relays adopt threshold decode-and-forward relay scheme and harvest energy from the primary transmitter with finite energy storage capacity under time switching scheme. Three best relay selection schemes, optimal source-relay link with wireless energy harvesting (WEH), optimal relay-destination link with WEH and optimal source-relay-destination link with WEH schemes, are proposed and studied. Closed-form analytical expressions for the outage probability of these three best relay selection schemes are derived, respectively. Finally, our analytical results are verified by Monte-Carlo simulations.

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Section: A Osrl-weh Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relay Selections for Cooperative Underlay CR Systems With Energy Harvesting

Liu

Zhao

et al. 2019

IEEE Trans. Cogn. Commun. Netw.

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“…The PDF and CDF for the random quantities

{false‖ {\overset{h}{true}}_{1, k} false‖}^{2}

in and ,

{false‖ {\overset{h}{true}}_{2, k}^{1} false‖}^{2}

in , and

{false‖ {\overset{h}{true}}_{2, k}^{1} false‖}^{2}

in will follow Gamma statistics with parameters Γ( m ,1) (see, eg, the work of Yu et al, and they can be expressed respectively as

f false(x false) = \frac{x^{m - 1} e^{- x}}{normalΓ false(m false)},

F false(x false) = 1 - e^{- x} true \sum_{r = 0}^{m - 1} \frac{x^{r}}{r!} .

…”

Section: System Modelmentioning

confidence: 99%

“…The PDF and CDF for the random quantities ||ĥ 1,k || 2 in (2) and (3), ||ĥ 1 2,k || 2 in (5), and ||ĥ 1 2,k || 2 in (6) will follow Gamma statistics with parameters Γ(m, 1) (see, eg, the work of Yu et al 22 ), and they can be expressed respectively as ‖…”

Section: System Modelmentioning

confidence: 99%

On cooperative NOMA relay selection under Nakagami‐m fading and imperfect channel estimation

Zhang

Serpedin

et al. 2018

Trans Emerging Tel Tech

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Nonorthogonal multiple access (NOMA), which is an effective technique to achieve high spectral efficiency, has been emerging as a candidate for the fifth‐generation multiple access. In addition, NOMA reflects a transition on the forms of power allocation comparing with the orthogonal multiple access (OMA). In this paper, two relay selection schemes are considered to evaluate the achieved performance of a NOMA‐based relaying network, ie, the max‐min relay selection (MMRS) and the two‐stage relay selection (TSRS) schemes. Exact expression analyses for the system outage probability using the MMRS and TSRS schemes are derived to evaluate the system performance under Nakagami‐m fading. The existence of the error floor, caused by the estimation error, is confirmed by the detailed analysis of the asymptotic result. By comparing NOMA with OMA, and comparing the MMRS scheme with the TSRS scheme, one can reveal that cooperative NOMA under Nakagami‐m fading and imperfect channel estimation can maintain superior performance gain than OMA.

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“…Consequently, how to achieve secure communication while guaranteeing efficient EH is of significant importance for CR network. To handle this challenge, an emerging technique termed as PHY layer security has attracted considerable interest in recent years [10][11][12][13][14]. By exploiting the physical properties of wireless channels, PHY layer security has great 2 Mathematical Problems in Engineering potential to achieve "perfect secrecy" and is identified as a significant complement to traditional cryptographic techniques.…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency Design for Secure MISO Cognitive Radio Network Based on a Nonlinear EH Model

et al. 2018

Mathematical Problems in Engineering

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In this work, we investigate the secrecy energy efficiency (SEE) optimization problem for a multiple-input single-output (MISO) cognitive radio (CR) network based on a practical nonlinear energy-harvesting (EH) model. In particular, the energy receiver (ER) is assumed to be a potential eavesdropper due to the open architecture of a CR network with simultaneous wireless information and power transfer (SWIPT), such that the confidential message is prone to be intercepted in wireless communications. The aim of this work is to provide a secure transmit beamforming design while satisfying the minimum secrecy rate target, the minimum EH requirement, and the maximum interference leakage power to primary user (PU). In addition, we consider that all the channel state information (CSI) is perfectly known at the secondary transmitter (ST). We formulate this beamforming design as a SEE maximization problem; however, the original optimization problem is not convex due to the nonlinear fractional objective function. To solve it, a novel iterative algorithm is proposed to obtain the globally optimal solution of the primal problem by using the nonlinear fractional programming and sequential programming. Finally, numerical simulation results are presented to validate the performance of the proposed scheme.

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On Outage of WPC System With Relay Selection Over Nakagami- $m$ Fading Channels

Cited by 21 publications

References 13 publications

Relay Selections for Cooperative Underlay CR Systems With Energy Harvesting

Relay Selections for Cooperative Underlay CR Systems With Energy Harvesting

On cooperative NOMA relay selection under Nakagami‐m fading and imperfect channel estimation

Energy Efficiency Design for Secure MISO Cognitive Radio Network Based on a Nonlinear EH Model

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