Reconfigurable Intelligent Surfaces for Energy Efficiency in Wireless Communication
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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.Abstract:
The adoption of a reconfigurable intelligent surface (RIS) for downlink multi-user communication from a multi-antenna base station is investigated in this paper. We develop 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. This leads to non-convex design optimization problems for which to tackle we propose two computationally affordable approaches, capitalizing on alternating maximization, gradient descent search, and sequential fractional programming. Specifically, one algorithm employs gradient descent for obtaining the RIS phase coefficients, and fractional programming for optimal transmit power allocation. Instead, the second algorithm employs sequential fractional programming for the optimization of the RIS phase shifts. In addition, a realistic power consumption model for RIS-based systems is presented, and the performance of the proposed methods is analyzed in a realistic outdoor environment. In particular, our results show that the proposed RIS-based resource allocation methods are able to provide up to 300% higher energy efficiency in comparison with the use of regular multi-antenna amplify-and-forward relaying.read more
Citations
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Journal ArticleDOI
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
TL;DR: In this paper, an intelligent reflecting surface (IRS) is invoked for enhancing the energy harvesting performance of a simultaneous wireless information and power transfer (SWIPT) aided system, where a multiantenna aided base station (BS) communicates with several multi-antenna assisted information receivers (IRs), while guaranteeing the EE requirement of the energy receivers (ERs).
Large Intelligent Surface/Antennas (LISA): Making Reflective Radios Smart
TL;DR: The reflective radio basics, including backscattering principles, backscatter communication, and reflective relay, and the fundamentals and implementations of LISA technology are introduced.
Posted Content
Capacity Characterization for Intelligent Reflecting Surface Aided MIMO Communication
Shuowen Zhang,Rui Zhang +1 more
TL;DR: The fundamental capacity limit of IRS-aided point-to-point multiple-input multiple-output (MIMO) communication systems with multi-antenna transmitter and receiver is characterized by jointly optimizing the IRS reflection coefficients and the MIMO transmit covariance matrix.
Journal ArticleDOI
Reconfigurable Intelligent Surfaces Assisted Communications With Limited Phase Shifts: How Many Phase Shifts Are Enough?
TL;DR: In this article, the authors evaluate the performance of an uplink RIS assisted communication system by giving an approximation of the achievable data rate, and investigate the effect of limited phase shifts on the data rate.
Posted Content
Reconfigurable Intelligent Surface-Based Index Modulation: A New Beyond MIMO Paradigm for 6G.
TL;DR: The findings reveal that RIS-based IM, which enables high data rates with remarkably low error rates, can become a potential candidate for future wireless communication systems in the context of beyond multiple-input multiple-output (MIMO) solutions.
References
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Journal ArticleDOI
Millimeter Wave Mobile Communications for 5G Cellular: It Will Work!
Theodore S. Rappaport,Shu Sun,Rimma Mayzus,Hang Zhao,Yaniv Azar,Kevin H. Wang,George N. Wong,Jocelyn K. Schulz,Mathew K. Samimi,Felix Gutierrez +9 more
TL;DR: The motivation for new mm-wave cellular systems, methodology, and hardware for measurements are presented and a variety of measurement results are offered that show 28 and 38 GHz frequencies can be used when employing steerable directional antennas at base stations and mobile devices.
Journal ArticleDOI
Scaling Up MIMO: Opportunities and Challenges with Very Large Arrays
Fredrik Rusek,Daniel Persson,Buon Kiong Lau,Erik G. Larsson,Thomas L. Marzetta,Fredrik Tufvesson +5 more
TL;DR: The gains in multiuser systems are even more impressive, because such systems offer the possibility to transmit simultaneously to several users and the flexibility to select what users to schedule for reception at any given point in time.
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.
MonographDOI
Lectures on modern convex optimization: analysis, algorithms, and engineering applications
TL;DR: The authors present the basic theory of state-of-the-art polynomial time interior point methods for linear, conic quadratic, and semidefinite programming as well as their numerous applications in engineering.
Journal ArticleDOI
A Tutorial on MM Algorithms
David R. Hunter,Kenneth Lange +1 more
TL;DR: The principle behind MM algorithms is explained, some methods for constructing them are suggested, and some of their attractive features are discussed.
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