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 Assisted mmWave UAV Wireless Cellular Networks
Lisi Jiang,Hamid Jafarkhani +1 more
TL;DR: In this article, the authors considered a RIS-assisted mmWave UAV wireless cellular network, where a UAV is serving several users with the help of multiple RISs, and they jointly optimized the deployment, user scheduling, beamforming vector and RIS phases to maximize the sum-rate, with the constraints of the minimum rate, the UAV movement, the analog beamforming and the RIS phases.
Journal ArticleDOI
Improper Signaling for Multicell MIMO RIS-Assisted Broadcast Channels With I/Q Imbalance
TL;DR: It is shown that RIS can significantly increase the spectral and energy efficiency of the system, while the reflecting surfaces perform very close to the upper-bound performance of RISs.
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Metasurface-Coated Devices: A New Paradigm for Energy-Efficient and Secure 6G Communications
TL;DR: In this article , the authors report energy efficiency, energy harvesting, and secure performance by employing power-collecting metasurface-coated devices capable of supporting ultralow-power (ULP) transmissions.
Journal ArticleDOI
Millimeter Wave Communications With an Intelligent Reflector: Performance Optimization and Distributional Reinforcement Learning
TL;DR: In this article , the authors proposed a distributional reinforcement learning (DRL) approach to learn the optimal IR reflection and maximize the expectation of downlink capacity, which converges to a stable distribution of the downlink transmission rate.
Journal ArticleDOI
Evaluation of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication System
Ramavath Prasad Naik,W. H. Chung +1 more
TL;DR: In this paper , the authors analyzed the bit error rate (BER), outage probability (OP) and channel capacity under the influence of underwater turbulence, beam attenuation, pointing errors and occlusion or blockage due to obstacles.
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