Optimal time sharing in underlay cognitive radio systems with RF energy harvesting

Rakovic, Valentin; Denkovski, Daniel; Hadzi-Velkov, Zoran; Gavrilovska, Liljana

doi:10.1109/icc.2015.7249556

Cited by 44 publications

(67 citation statements)

References 16 publications

(39 reference statements)

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“…In Scenario 2, the locations of the two additional PBs are at (0, 5) and (−2, −2). In case that PT is located near the secondary network, we assume that the coordinate of PT is (20,30). We consider = , = + 1, Ω = Ω = 0.5 for simple presentation given that listing out all the values is lengthy.…”

Section: Resultsmentioning

confidence: 99%

“…Among different cognitive paradigms, an underlay mode in which SN users transmit in the same band with the primary transmitters simultaneously subject to an interference constraint at the primary receiver is the simplest and is easy to implement in practice. Therefore, many studies have considered energy harvesting for underlay CR networks; see, for example, [18][19][20][21][22]. In [18], the authors analyzed the outage probability and spatial throughput of the SN users.…”

Section: Introductionmentioning

confidence: 99%

“…In [19], a harvested energy-throughput trade-off optimization problem was formulated and a closed-form solution was obtained. Optimal resource allocation (i.e., time sharing and power) for EH-based CR networks was considered in [20,21]. Also, an extension to joint time and power allocation for maximal sum-throughput in multiuser EH-based CR networks was studied in [22].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Outage Probability Analysis in Power-Beacon Assisted Energy Harvesting Cognitive Relay Wireless Networks

2017

Wireless Communications and Mobile Computing

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We study the performance of the secondary relay system in a power-beacon (PB) assisted energy harvesting cognitive relay wireless network. In our system model, a secondary source node and a relay node first harvest energy from distributed PBs. Then, the source node transmits its data to the destination node with the help of the relay node. Also, fading coefficients of the links from the PBs to the source node and relay node are assumed independent but not necessarily identically distributed (i.n.i.d) Nakagami-random variables. We derive exact expressions for the power outage probability and the channel outage probability. Based on that, we analyze the total outage probability of the secondary relay system. Asymptotic analysis is also performed, which provides insights into the system behavior. Moreover, we evaluate impacts of the primary network on the performance of the secondary network with respect to the tolerant interference threshold at the primary receiver as well as the interference introduced by the primary transmitter at the secondary source and relay nodes. Simulation results are provided to validate the analysis.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Outage Probability Analysis in Power-Beacon Assisted Energy Harvesting Cognitive Relay Wireless Networks

2017

Wireless Communications and Mobile Computing

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“…Authors obtained maximum spatial throughput of SU under outage constraints for coexisting network. In [14], authors have considered a slotted underlay system. In each slot, SU first harvests from primary transmission for some duration and then transmits it's own data taking interference at primary receiver into account.…”

Section: Introductionmentioning

confidence: 99%

“…EH-CRNs operating in interweave, overlay and underlay mode, have been extensively considered in the literature [4]- [14].…”

Section: Introductionmentioning

confidence: 99%

On energy cooperation in energy harvesting underlay cognitive radio network

Pathak

Banerjee

2016

2016 Twenty Second National Conference on Communication (NCC)

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Abstract-In this paper, we consider an energy harvesting cognitive radio network (EH-CRN), where a primary and a secondary user coexist in underlay mode. Both the transmitters have energy harvesting capability and are equipped with finite capacity battery to store the harvested energy. In addition, the secondary user (SU) has an independent energy transfer unit such that it can transfer some portion of it's harvested energy to the primary user (PU). We obtain an optimal transmit power and energy transfer policy for single-slot and a suboptimal policy for multi-slot scenario maximizing the number of bits transmitted by SU under the primary sum-rate constraint in an offline setting. For both cases, the effect of energy cooperation on the system performance is studied and it is observed that energy cooperation results in higher SU throughput.

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A POMDP‐based long‐term transmission rate maximization for cognitive radio networks with wireless‐powered ambient backscatter

Giang

Hoan

Thanh

et al. 2019

Int J Communication

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SummaryWireless energy harvesting enables wireless‐powered communications to accommodate data services in a self‐sustainable manner over a long operational time. Along with energy harvesting, an ambient backscatter technique helps a secondary transmitter reflect existing radio frequency (RF) signal sources to communicate with a secondary receiver when the primary channel (PC) is utilized. However, secondary system performance is significantly affected by factors such as the availability of the primary channel, imperfect spectrum sensing, and energy‐constrained problems. Therefore, we propose a novel approach for wireless‐powered cognitive radio networks (CRNs) to improve the transmission performance of secondary systems. To reduce the dependence of the secondary system on RF sources, in the paper, we provide a new paradigm by integrating ambient backscattering with both RF and non‐RF wireless‐powered communications to facilitate secondary communications. On the basis of the sensing result in a time slot, the secondary transmitter can dynamically select the operational action: (a) backscattering, (b) harvesting, or (c) transmitting to maximize the long‐term achievable data transmission rate at the secondary receiver. In addition, the optimal action set for CRNs with wireless‐powered ambient backscatter is selected by the partially observable Markov decision process (POMDP), which maximizes an expected transmission rate calculated over a number of subsequent time slots. The proposed scheme aims to improve long‐term transmission rate of CRNs with wireless‐powered ambient backscatter in comparison with conventional schemes where an action is taken only to maximize the immediate reward in every single time slot.

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Optimal time sharing in underlay cognitive radio systems with RF energy harvesting

Cited by 44 publications

References 16 publications

Outage Probability Analysis in Power-Beacon Assisted Energy Harvesting Cognitive Relay Wireless Networks

Outage Probability Analysis in Power-Beacon Assisted Energy Harvesting Cognitive Relay Wireless Networks

On energy cooperation in energy harvesting underlay cognitive radio network

A POMDP‐based long‐term transmission rate maximization for cognitive radio networks with wireless‐powered ambient backscatter

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