Non-Uniform Deployment of Power Beacons in Wireless Powered Communication Networks

Liang, Kai; Zhao, Liqiang; Zheng, Gan; Chen, Hsiao‐Hwa

doi:10.1109/twc.2019.2899098

Cited by 13 publications

(23 citation statements)

References 38 publications

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“…Meanwhile, the energy harvested by S i is E i = g(P i ), where g is a real function modeling the relation between the incident RF power and harvested power. Herein, we consider a simple linear EH model, i.e., g(P i ) = ηP i , where η ∈ [0, 1), for analytical tractability, thus facilitating the discussions and deriving important performance insights as in [5], [8], [9], [12], [17]. Note that using the linear model allows us to state that E[g(P i )] = g(E[P i ]), thus we can refer to power and energy indistinctly by normalizing the EH time, but more importantly, maximizing the average harvested energy translates to maximizing the average RF power, and we can focus on the latter.…”

Section: A Signal Modelmentioning

confidence: 99%

“…Authors in [18] demonstrated that v constructed as in (5) (5) does not depend on the instantaneous channel realizations, we can further reduce (9) by using (8) as follows…”

Section: A Beamformer Designmentioning

confidence: 99%

“…Likewise, another directional charging model is developed in [4] but to optimize a network utility function, i.e., the network average harvested energy. Meanwhile, a nonuniform PBs deployment strategy is designed in [5] such that a base station (BS) and the multiple PBs can cooperate to power the entire set of energy harvesting (EH) devices. They derived the network total power consumption to satisfy a certain energy coverage probability requirement, and showed the important energy savings coming from the cooperation of the BS in the WET process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

CSI-free Rotary Antenna Beamforming for Massive RF Wireless Energy Transfer

López¹,

Alves²,

Montejo‐Sánchez³

et al. 2021

Preprint

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Radio frequency (RF) wireless energy transfer (WET) is a key technology that may allow seamlessly powering future massive low-energy Internet of Things (IoT) networks. To enable efficient massive WET, channel state information (CSI)limited/free multi-antenna transmit schemes have been recently proposed in the literature. The idea is to reduce/null the energy costs to be paid by energy harvesting (EH) IoT nodes from participating in large-scale time/power-consuming CSI training, but still enable some transmit spatial gains. In this paper, we take another step forward by proposing a novel CSI-free rotary antenna beamforming (RAB) WET scheme that outperforms all state-of-the-art CSI-free schemes in a scenario where a power beacon (PB) equipped with a uniform linear array (ULA) powers a large set of surrounding EH IoT devices. RAB uses a properly designed CSI-free beamformer combined with a continuous or periodic rotation of the ULA at the PB to provide average EH gains that scale as 0.85 √ M , where M is the number of PB's antenna elements. Moreover, a rotation-specific power control mechanism was proposed to i) fairly optimize the WET process if devices' positioning information is available, and/or ii) to avoid hazards to human health in terms of specific absorption rate (SAR), which is an RF exposure metric that quantifies the absorbed power in a unit mass of human tissue. We show that RAB performance even approaches quickly (or surpasses, for scenarios with sufficiently large number of EH devices, or when using the proposed power control) the performance of a traditional full-CSI based transmit scheme, and it is also less sensitive to SAR constraints. Finally, we discuss important practicalities related to RAB such as its robustness against non line-of-sight conditions compared to other CSI-free WET schemes, and its generalizability to scenarios where the PB uses other than a ULA topology.

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Section: A Signal Modelmentioning

confidence: 99%

“…Authors in [18] demonstrated that v constructed as in (5) (5) does not depend on the instantaneous channel realizations, we can further reduce (9) by using (8) as follows…”

Section: A Beamformer Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

CSI-free Rotary Antenna Beamforming for Massive RF Wireless Energy Transfer

López¹,

Alves²,

Montejo‐Sánchez³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Interesting tradeoffs between transmit power and density of BSs and PBs are derived under an outage constraint on the data link. Multiple antennas at the BS and PBs are considered in [19], where the latter are deployed following a PPP with certain density.…”

Section: Introductionmentioning

confidence: 99%

On the Optimal Deployment of Power Beacons for Massive Wireless Energy Transfer

Rosabal

López

Alves

et al. 2021

IEEE Internet Things J.

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Wireless energy transfer (WET) is emerging as an enabling green technology for Internet of Things (IoT) networks. WET allows the IoT devices to wirelessly recharge their batteries with energy from external sources such as dedicated radio frequency transmitters called power beacons (PBs). In this paper, we investigate the optimal deployment of PBs that guarantees a network-wide energy outage constraint. Optimal positions for the PBs are determined by maximizing the average incident power for the worst location in the service area since no information about the sensor deployment is provided. Such network planning guarantees the fairest harvesting performance for all the IoT devices. Numerical simulations evidence that our proposed optimization framework improves the energy supply reliability compared to benchmark schemes. Additionally, we show that although both, the number of deployed PBs and the number of antennas per PB, introduce performance improvements, the former has a dominant role. Finally, our proposal allows to extend the coverage area while keeping the total power budget fixed, which additionally reduces the level of electromagnetic radiation in the vicinity of PBs.

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“…At present, the shortage of standby time and energy deficiency have become the main bottleneck, which is fundamentally restricting the large-scale popularization of IoT applications [4]. Fortunately, the emergence of advanced wireless powered communication (WPC), which takes advantage of radiofrequency energy harvesting (RF-EH) technology, provides a viable method to extend the longevity of energy-limited wireless network and to sustain IoT in a long run [5]- [7]. In general, any wireless communication network composed of devices that harvest energy for information exchange needs can be called a wireless powered communication network (WPCN).…”

mentioning

confidence: 99%

Secure Multiuser Scheduling for Hybrid Relay-Assisted Wireless Powered Cooperative Communication Networks With Full-Duplex Destination-Based Jamming

Shang

Yin²,

Wang

et al. 2021

IEEE Access

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In this paper, we investigate secure communication in a hybrid relay (HR)-assisted wireless powered cooperative communication network (WPCCN), where an eavesdropper tries to intercept the data transmitted by a source user and the HR simultaneously. The HR has the ability to wireless powered the energy-constrained multiple users in the downlink and to relay the received confidential information in the uplink. In particular, the full-duplex destination-based jamming (FD-DBJ) strategy is exploited to improve the secrecy performance. Moreover, in order to conduct effective secure communications, we design two multiuser scheduling schemes, i.e., random user selection (RUS), and best user selection (BUS) based on the main channel quality. In order to evaluate the secrecy performance, we analytically derive the energy outage probability (EOP), the secrecy outage probability (SOP), and the hybrid outage probability (HOP), respectively. As such, we formulate the secrecy throughput (ST) maximization problem to optimize the predetermined transmission rate. Our analysis and numerical results reveal that: 1) The BUS scheme has better security performance. 2) Both of the energy conversion efficiency and the number of users have a positive effect on secrecy performance. 3) The FD-DBJ scheme is an effective method to achieve secure communications. 4) The the time-switching factor and predetermined transmission rate have a crucial influence on the secrecy performance, which should be considered carefully in system design. INDEX TERMS Wireless powered cooperative communication networks, hybrid relay, full-duplex destination-based jamming, physical layer security, secrecy outage probability. I. INTRODUCTION A. BACKGROUND VOLUME 4

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Non-Uniform Deployment of Power Beacons in Wireless Powered Communication Networks

Cited by 13 publications

References 38 publications

CSI-free Rotary Antenna Beamforming for Massive RF Wireless Energy Transfer

CSI-free Rotary Antenna Beamforming for Massive RF Wireless Energy Transfer

On the Optimal Deployment of Power Beacons for Massive Wireless Energy Transfer

Secure Multiuser Scheduling for Hybrid Relay-Assisted Wireless Powered Cooperative Communication Networks With Full-Duplex Destination-Based Jamming

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