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“…where ∈ C × is the energy beamforming vector [48] of . We adopt a piece-wise linear EH model [49], in which the harvested power is linearly boosted with the received power up to a threshold, called the saturation point. Let and show the linear energy conversion efficiency and the saturation power, respectively.…”
Section: Energy Model Of Uavsmentioning
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“…where ∈ C × is the energy beamforming vector [48] of . We adopt a piece-wise linear EH model [49], in which the harvested power is linearly boosted with the received power up to a threshold, called the saturation point. Let and show the linear energy conversion efficiency and the saturation power, respectively.…”
Section: Energy Model Of Uavsmentioning
“…Since then, WPCN has gained considerable attention as an indispensable building block for the realization of the self-sustaible IoE. Extensive research has been done for extending WPCNs and improving their performance, among which we can name designing energy beamforming vectors [5], [6], adding full-duplex (FD) operation for simultaneous downlink energy and uplink information transfer [7], designing channel acquisition techniques for more accurate energy beamforming [8], enabling cooperation mechanisms [9]- [11], using power beacons (PBs) to enhance the efficiency of wireless energy transfer (WET) [12], and integrating this technology with relay-based communication networks [13]- [16]. Readers can refer to [1]- [3] for more details on the fundamentals of WPCN.…”
Section: A Related Workmentioning
“…However, this model cannot be easily implemented in convex optimization toolboxes such as CVX [37] without further approximations and transformations, especially when the received power varies over the harvesting period and the harvested power becomes a sum-of-ratios expression. Another EH model has been used in the literature which models the input-output power relationship of an energy harvester with a piece-wise linear function with two pieces, where the output power linearly increases with the input power up to the saturation point, beyond which the output power remains constant [16], [18]. This model is more tractable than the sigmoidal model, however, it does not account for the sensitivity of EH circuits.…”
Section: A Eh Modelmentioning
“…In [8] considers different WPCN scenarios composed of three nodes, in which multi-antenna relay not only WET the source node of a single antenna, but also cooperatively forward the information from the source node to the destination of the single antenna. In [9] considers a double-hop WPCN, in which the two-way communication between the user and the access point is assisted by a relay. The piecewise linear energy collection model of user and relay studies the problem of maximizing the total throughput of amplified and decoded relay mode, in which the energy transmitter is multiple antennas, the information access point and the user each have one antenna, and the relay has two antennas.…”
Section: Introductionmentioning
“…Multi-antenna HAP is capable of downlink energy beamforming, which enables HAP to deliver more power to a specific user. In [9] addition to the multi-antenna system, the access point also adopts full-duplex communication, which improves the total throughput in full-duplex WPCN compared with halfduplex WPCN. Therefore, relay-assisted communication is an essential element in the IoT world.…”
Section: Introductionmentioning