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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Proceedings ArticleDOI
Reconfigurable Intelligent Surface for Interference Alignment in MIMO Device-to-Device Networks
Min Fu,Yong Zhou,Yuanming Shi +2 more
TL;DR: In this article, a reconfigurable intelligent surface (RIS) assisted interference alignment strategy was proposed to simultaneously mitigate the co-channel interference and cope with rank-deficient channels, thereby improving the feasibility of interference alignment conditions and in turn increasing the achievable DoF.
Proceedings ArticleDOI
Relay–Reconfigurable Intelligent Surface Cooperation for Energy-Efficient Multiuser Systems
Mohanad Obeed,Anas Chaaban +1 more
TL;DR: In this paper, a multi-user communication system is proposed in which a relay and a reconfigurable intelligent surface (RIS) cooperate to improve performance in terms of energy efficiency, where the discrete phase shifts of the RIS elements are optimized along with the beamforming matrices at the transmitter and the relay, targeting the minimization of the total transmit power subject to a quality-of-service (QoS) constraint.
Proceedings ArticleDOI
Robust Beamforming for IRS-assisted Wireless Communications under Channel Uncertainty
TL;DR: In this paper, the authors considered IRS-assisted transmissions from a multi-antenna access point (AP) to a receiver with uncertain channel information and formulated a robust optimization problem to minimize the AP's transmit power, subject to the receiver's worst-case data rate requirement and the IRS's worstcase power budget constraint.
Proceedings ArticleDOI
Energy Efficiency Optimization in IRS-Enhanced mmWave Systems with Lens Antenna Array
TL;DR: In this article, the authors proposed an intelligent reflecting surface (IRS) enhanced multi-user mm-wave communication system with lens antenna array, where the transmit beamforming at base station and the reflect beamforming in RISs are jointly considered.
Proceedings ArticleDOI
Phase Configuration Learning in Wireless Networks with Multiple Reconfigurable Intelligent Surfaces
TL;DR: In this article, a typical communication pair between two nodes is assisted by a plurality of RISs, and devise low-complexity supervised learning approaches for the RISs' phase configurations.
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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