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
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Phase Configuration Learning in Wireless Networks with Multiple Reconfigurable Intelligent Surfaces
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TL;DR: In this article, an intelligent reflecting surface (IRS) was introduced to improve the spectral efficiency of cognitive radio (CR) systems by allowing the secondary users to share spectrum with the primary users.
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Joint Beam and Polarization Forming of Intelligent Reflecting Surfaces for Wireless Communications
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Resource Allocation for Intelligent Reflecting Surface Assisted Wireless Powered IoT Systems With Power Splitting
TL;DR: In this article , the authors proposed a new transmission policy for intelligent reflecting surface (IRS) empowered wireless powered internet of things systems, where an energy station (ES) wirelessly charges for multiple IoT devices during downlink wireless energy transfer and then these devices deliver their own message to an access point (AP) during uplink wireless information transfer.
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Intelligent Reflecting Surface and UAV Assisted Secrecy Communication in Millimeter-Wave Networks
TL;DR: In this paper, a secure transmission problem in an unmanned aerial vehicle (UAV) and intelligent reflecting surface (IRS) assisted mmWave networks in the presence of an eavesdropper is considered.
References
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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.
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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.
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Lectures on modern convex optimization: analysis, algorithms, and engineering applications
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