Open AccessPosted Content
Intelligent Reflecting Surface Aided MIMO Broadcasting for Simultaneous Wireless Information and Power Transfer
Cunhua Pan,Hong Ren,Kezhi Wang,Maged Elkashlan,Arumugam Nallanathan,Jiangzhou Wang,Lajos Hanzo +6 more
TLDR
An intelligent reflecting surface (IRS) is invoked for enhancing the energy harvesting performance of a simultaneous wireless information and power transfer (SWIPT) aided system and the proposed BCD algorithm converges rapidly, which is appealing for practical applications.Abstract:
An intelligent reflecting surface (IRS) is invoked for enhancing the energy harvesting performance of a simultaneous wireless information and power transfer (SWIPT) aided system. Specifically, an IRS-assisted SWIPT system is considered, where a multi-antenna aided base station (BS) communicates with several multi-antenna assisted information receivers (IRs), while guaranteeing the energy harvesting requirement of the energy receivers (ERs). To maximize the weighted sum rate (WSR) of IRs, the transmit precoding (TPC) matrices of the BS and passive phase shift matrix of the IRS should be jointly optimized. To tackle this challenging optimization problem, we first adopt the classic block coordinate descent (BCD) algorithm for decoupling the original optimization problem into several subproblems and alternatively optimize the TPC matrices and the phase shift matrix. For each subproblem, we provide a low-complexity iterative algorithm, which is guaranteed to converge to the Karush-Kuhn-Tucker (KKT) point of each subproblem. The BCD algorithm is rigorously proved to converge to the KKT point of the original problem. We also conceive a feasibility checking method to study its feasibility. Our extensive simulation results confirm that employing IRSs in SWIPT beneficially enhances the system performance and the proposed BCD algorithm converges rapidly, which is appealing for practical applications.read more
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Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces: How It Works, State of Research, and The Road Ahead
Marco Di Renzo,Alessio Zappone,Merouane Debbah,Mohamed-Slim Alouini,Chau Yuen,Julien de Rosny,Sergei A. Tretyakov +6 more
TL;DR: Reconfigurable intelligent surfaces (RISs) can be realized in different ways, which include (i) large arrays of inexpensive antennas that are usually spaced half of the wavelength apart; and (ii) metamaterial-based planar or conformal large surfaces whose scattering elements have sizes and inter-distances much smaller than the wavelength.
Journal ArticleDOI
Beamforming Optimization for Wireless Network Aided by Intelligent Reflecting Surface With Discrete Phase Shifts
Qingqing Wu,Rui Zhang +1 more
TL;DR: Analytically show that as compared to the ideal case with continuous phase shifts, the IRS with discrete phase shifts achieves the same squared power gain in terms of asymptotically large number of reflecting elements, while a constant proportional power loss is incurred that depends only on the number of phase-shift levels.
Journal ArticleDOI
Multicell MIMO Communications Relying on Intelligent Reflecting Surfaces
TL;DR: This paper proposes to invoke an IRS at the cell boundary of multiple cells to assist the downlink transmission to cell-edge users, whilst mitigating the inter-cell interference, which is a crucial issue in multicell communication systems.
Journal ArticleDOI
Toward Smart Wireless Communications via Intelligent Reflecting Surfaces: A Contemporary Survey
TL;DR: A literature review on recent applications and design aspects of the intelligent reflecting surface (IRS) in the future wireless networks, and the joint optimization of the IRS’s phase control and the transceivers’ transmission control in different network design problems, e.g., rate maximization and power minimization problems.
Journal ArticleDOI
Intelligent Reflecting Surface: Practical Phase Shift Model and Beamforming Optimization
TL;DR: In this article, an IRS-aided multiuser system with one RIS deployed to assist in the downlink communications from a multi-antenna access point (AP) to multiple singleantenna users is considered, and an optimization problem to minimize the total transmit power at the AP by jointly designing the AP transmit beamforming and the RIS reflect beamforming, subject to the users' individual signal-to-interference-plus-noise ratio (SINR) constraints.
References
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Journal ArticleDOI
Intelligent Reflecting Surface Enhanced Wireless Network via Joint Active and Passive Beamforming
Qingqing Wu,Rui Zhang +1 more
TL;DR: Simulation results demonstrate that an IRS-aided single-cell wireless system can achieve the same rate performance as a benchmark massive MIMO system without using IRS, but with significantly reduced active antennas/RF chains.
Journal ArticleDOI
MIMO Broadcasting for Simultaneous Wireless Information and Power Transfer
Rui Zhang,Chin Keong Ho +1 more
TL;DR: This paper studies a multiple-input multiple-output (MIMO) wireless broadcast system consisting of three nodes, where one receiver harvests energy and another receiver decodes information separately from the signals sent by a common transmitter, and all the transmitter and receivers may be equipped with multiple antennas.
Journal ArticleDOI
Reconfigurable Intelligent Surfaces for Energy Efficiency in Wireless Communication
TL;DR: In this article, the authors developed energy-efficient designs for both the transmit power allocation and the phase shifts of the surface reflecting elements subject to individual link budget guarantees for the mobile users.
Journal ArticleDOI
Coding metamaterials, digital metamaterials and programmable metamaterials
TL;DR: Digital metamaterials consisting of two kinds of unit cells whose different phase responses allow them to act as ‘0’ and ‘1’ bits are developed to enable controlled manipulation of electromagnetic waves.
Posted Content
Coding Metamaterials, Digital Metamaterials and Programming Metamaterials
TL;DR: In this paper, Wu et al. proposed a digital metamaterial with two kinds of unit cells with 0 and π phase responses, which they named as "0" and "1" elements.
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