Throughput Maximization for IRS-Assisted Wireless Powered Hybrid NOMA and TDMA

Zhang, Ding-Cai; Wu, Qingqing; Cui, Miao; Zhang, Guangchi; Niyato, Dusit

doi:10.1109/lwc.2021.3087495

Cited by 77 publications

(43 citation statements)

References 14 publications

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“…Recently, various existing works investigated the integration of IRS and wireless powered communications (WPC), which aims to simultaneously improve energy collection and information delivery capabilities by passively controlling energy/information reflection [6]- [13]. In [6], the integration of IRS and simultaneous wireless information and power transfer (SWIPT) was considered in a multiple-input multipleoutput (MISO) downlink system.…”

Section: A Literature Reviewmentioning

confidence: 99%

“…Also, the semi-closed-form IRS phase shifts can be derived by using an alternating optimization (AO) algorithm. Similar scenario was extended to multi-cluster case, where multiple IoT devices were grouped into clusters [13]. The IRS participates to passively reflect energy and information at the downlink WET and uplink WIT durations, respectively.…”

Section: A Literature Reviewmentioning

confidence: 99%

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Wireless-Powered Intelligent Radio Environment With Nonlinear Energy Harvesting

Chu

Xiao

et al. 2022

IEEE Internet Things J.

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Section: A Literature Reviewmentioning

confidence: 99%

Section: A Literature Reviewmentioning

confidence: 99%

Wireless-Powered Intelligent Radio Environment With Nonlinear Energy Harvesting

Chu

Xiao

et al. 2022

IEEE Internet Things J.

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“…C. Proposed Algorithm for Problem (15) Before solving problem (15), we first transform it into an equivalent but more tractable form. +1) , and P = diag ([1 N ×1 ; 0]).…”

Section: B Are Dedicated Energy Beams Necessary?mentioning

confidence: 99%

“…While the works [5], [9]- [14] mainly focus on exploiting IRS for effective WIT, the high passive beamforming gain promised by IRS is also attractive for WPT [1], [4]. To reap this benefit, one line of research investigated IRS-aided wireless-powered communication networks (WPCNs), aiming at improving the communication performance by leveraging an IRS to assist WPT and WIT across different time slots [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

“…If the IRS is equipped with active sensors, traditional channel estimation techniques can be applied for the IRS to estimate the channels of the AP-IRS and IRS-user links, respectively; otherwise, the CSI of individual links can be acquired using the methods in[34]-[36] 2. For simplicity, we adopt a linear EH model which is widely used in existing works such as[15]-[20]. The generalization to the case with a non-linear EH model is postponed to a future work.…”

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confidence: 99%

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Beamforming Optimization for Active Intelligent Reflecting Surface-Aided SWIPT

Gao,

Wu,

Zhang

et al. 2022

Preprint

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Active intelligent reflecting surface (IRS) has been recently proposed to alleviate the product path loss attenuation inherent in the IRS-aided cascaded channel. In this paper, we study an active IRS-aided simultaneous wireless information and power transfer (SWIPT) system. Specifically, an active IRS is deployed to assist a multi-antenna access point (AP) to convey information and energy simultaneously to multiple single-antenna information users (IUs) and energy users (EUs). Two joint transmit and reflect beamforming optimization problems are investigated with different practical objectives. The first problem maximizes the weighted sum-power harvested by the EUs subject to individual signal-to-interference-plusnoise ratio (SINR) constraints at the IUs, while the second problem maximizes the weighted sum-rate of the IUs subject to individual energy harvesting (EH) constraints at the EUs. The optimization problems are non-convex and difficult to solve optimally. To tackle these two problems, we first rigorously prove that dedicated energy beams are not required for their corresponding semidefinite relaxation (SDR) reformulations and the SDR is tight for the first problem, thus greatly simplifying the AP precoding design. Then, by capitalizing on the techniques of alternating optimization (AO), SDR, and successive convex approximation (SCA), computationally efficient algorithms are developed to obtain suboptimal solutions of the resulting optimization problems. Simulation results demonstrate that, given the same total system power budget, significant performance gains in terms of operating range of wireless power transfer (WPT), total harvested energy, as well as achievable rate can be obtained by our proposed designs over benchmark schemes (especially the one adopting a passive IRS). Moreover, it is advisable to deploy an active IRS in the proximity of the users for the effective operation of WPT/SWIPT.

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RIS in Wireless Information and Power Transfer

Zhao,

Clerckx

2023

Intelligent Surfaces Empowered 6G Wireless Network

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Throughput Maximization for IRS-Assisted Wireless Powered Hybrid NOMA and TDMA

Cited by 77 publications

References 14 publications

Wireless-Powered Intelligent Radio Environment With Nonlinear Energy Harvesting

Wireless-Powered Intelligent Radio Environment With Nonlinear Energy Harvesting

Beamforming Optimization for Active Intelligent Reflecting Surface-Aided SWIPT

RIS in Wireless Information and Power Transfer

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