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Showing 1 to 15 of 15 for “"Reconfigurable Intelligent Surfaces"”.
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Robust Wireless Communications with Applications to Reconfigurable Intelligent Surfaces
… With the recent introduction of electromagnetic reconfigurable intelligent surfaces (RIS), a paradigm shift is currently taking place in the world of wireless communications. These new technologies have enabled the inclusion of the wireless channel as part of the optimization process. In order to …
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Advancements in Radar Sensing and Communications through Reconfigurable Intelligent Surfaces
Reconfigurable Intelligent Surfaces (RIS) represents a promising technology for reshaping wireless channels, offering a new degree of freedom in the design of next-generation wireless networks. Specifically, RIS has shown significant potential in enabling smart, programmable environments by …
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Contemporary Approaches to Radar Detection: Robust Statistics, Reinforcement Learning, and Reconfigurable Intelligent Surfaces
… statistics, reinforcement learning (RL), and reconfigurable intelligent surfaces (RIS) to improve upon existing radar detection techniques. This work focuses only on monostatic co-located MIMO radar and radar networks. First, we look at the role of robust detection statistics and RL in radar …
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Design of reconfigurable intelligent surface for 5G wireless communication system
… demand for high-speed, reliable connectivity. Reconfigurable Intelligent Surfaces (RISs) have emerged as a promising technology to address the challenges of wireless communication, offering unprecedented control over electromagnetic wave propagation in various environments. In addition, RISs …
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Sum-rate maximization in multi-RIS multi-carrier systems through active power allocation and passive beamforming
… division multiplexing (OFDM) framework. Reconfigurable intelligent surfaces (RIS) offer low-cost and energy-efficient solutions for enhancing wireless communication. In this work, we jointly optimize the transmit power at the base station (BS) and the passive beamforming of RIS reflecting …
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Hybrid classical-quantum optimization algorithms in electromagnetic applications
… design, with a particular focus on reconfigurable intelligent surfaces (RISs) and antenna array synthesis. A broad class of electromagnetic tasks—including discrete-phase RIS configuration, antenna beamforming and null steering for multi-user links and wireless power transfer, and …
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ML-Based Optimization of Large-Scale Systems: Case Study in Smart Microgrids and 5G RAN
… the integration of new techniques, such as reconfigurable intelligent surfaces (RISs), requires more efficient algorithms for network optimization. Consequently, intelligent management schemes are crucial to schedule network resources. In this work, we aim to develop state-of-the-art ML …
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An Information-Theoretic Examination of Next Generation Location Systems: The Role of LEOs, RISs and the Near Field
… approaches—low Earth orbit (LEO) satellites, reconfigurable intelligent surfaces (RISs), and near-field propagation—to enhance localization accuracy and resilience. LEO satellites, originally designed for communication, have recently seen widespread deployment through constellations such as …
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Online Optimization for Edge Computing under Uncertainty in Wireless Networks
… when a base station is assisted by self-powered reconfigurable intelligent surfaces (RIS). To this end, a deep reinforcement learning approach is proposed to jointly optimize the transmit power, phase shifting, and RIS reflector's ON/OFF states under the uncertainties on the downlink wireless …
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Reconfigurable Intelligent Metasurfaces for Wireless Communication and Sensing Applications
In recent years, metasurfaces have shown promising abilities to control and manipulate electromagnetic (EM) waves through modified surface boundary conditions. These surfaces are electrically thin and comprise an array of spatially varying sub-wavelength scattering elements (or meta-atoms). …
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Design and Optimization of 5G and Beyond Hybrid Communication Systems
… the presence of multipath, efficiently utilize reconfigurable intelligent surfaces (RIS) to enhance mmWave coverage in urban environments, and synchronize and calibrate in distributed massive MIMO networks for 6G systems, where the synchronization involves the carrier frequency offset estimation …
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Precise Geolocation for Drones, Metaverse Users, and Beyond: Exploring Ranging Techniques Spanning 40 KHz to 400 GHz
… Access (FH-CDMA) and incorporate devices such as Reconfigurable Intelligent Surfaces (RIS) and photonic oscillators to fortify the system against errors stemming from ranging-related factors. Secondly, we devised novel evolutionary-based optimization algorithms, adept at addressing the complex …
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Building the Foundations and Experiences of 6G and Beyond Networks: A Confluence of THz Systems, Extended Reality (XR), and AI-Native Semantic Communications
… holographic teleportation, and human-like intelligent robotic applications. Such applications require a set of stringent sensing, communication, control, and intelligence requirements that mandate a leap in the design, analysis, and optimization of today's wireless networks. First, from a …
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Advancing RIS Optimization: From Ideal to Realistic Models
Owing to the ability of reconfigurable intelligent surfaces (RISs) to control the propagation environment in their vicinity, they have emerged as an appealing solution to enhance the performance of next-generation wireless networks. These surfaces consist of low-cost, energy-efficient reflecting …