Standalone-Intelligent Reflecting Surface Control Method Using Hierarchical Exploration by Beamwidth Expansion and Environment-Adaptive Codebook

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Mobility-Aware User Association Strategy for IRS-Aided mm-Wave Multibeam Transmission Towards 6G

Hiroaki Hashida et al.

Summary: This paper proposes an IRS-user association strategy considering user mobility for IRS-aided multibeam transmission systems, aiming to optimize system capacity and reliability, while reducing channel estimation overhead.

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS (2022)

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Article Engineering, Electrical & Electronic

Intelligent Omni-Surfaces: Reflection-Refraction Circuit Model, Full-Dimensional Beamforming, and System Implementation

Shuhao Zeng et al.

Summary: This paper proposes a circuit-based reflection-refraction model for the intelligent omni-surface (IOS) and validates its accuracy through experiments. The model can be utilized to optimize the beamforming of IOS-assisted networks and improve system performance.

IEEE TRANSACTIONS ON COMMUNICATIONS (2022)

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Article Engineering, Electrical & Electronic

Selective Reflection Control: Distributed IRS-Aided Communication With Partial Channel State Information

Hiroaki Hashida et al.

Summary: The proposed passive beamforming method called selective reflection control (SRC) in distributed IRS communication systems enhances user sum rate and robust transmissions against shielding by determining associations between IRS and user equipment (UE) to reduce channel estimation overheads. The method outperforms benchmark methods and is expected to accelerate large-scale IRS deployment.

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY (2022)

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Proceedings Paper Computer Science, Information Systems

Codebook Design for Large Reconfigurable Refractive Surface Enabled Holographic MIMO Systems

Yutong Zhang et al.

Summary: This paper investigates a holographic multiple-input multiple-output (HMI-MO) scheme for a multi-user system, which utilizes reconfigurable refractive surfaces as antenna arrays and employs a codebook and beam training mechanism for beamforming. To reduce overhead, a hybrid near-far field codebook is designed for all user locations, enabling a multi-user beam training mechanism.

2022 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM 2022) (2022)

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Proceedings Paper Engineering, Electrical & Electronic

A Simple Beamforming Technique for Intelligent Reflecting Surfaces in 5G Scenarios

Daniel Martinez-de-Rioja et al.

Summary: This contribution proposes a simple closed-form formula for computing the phase-shift distribution on Intelligent Reflecting Surfaces (IRS) to control the beam. By introducing quadratic phase correction in the phase distribution, independent control of the beam can be achieved, which is suitable for the design of low-cost passive IRS panels.

2022 INTERNATIONAL WORKSHOP ON ANTENNA TECHNOLOGY (IWAT) (2022)

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Article Engineering, Electrical & Electronic

Wideband Reflectarrays for 5G/6G: A Survey

Panagiotis Ioannis Theoharis et al.

Summary: This paper discusses the latest developments in wideband reflectarray antennas, categorizing them based on four wideband phase tuning mechanisms. The impact of different tuning methods on antenna performance is analyzed, and guidelines are provided for designing reflectarrays with wide gain-bandwidth.

IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION (2022)

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Article Engineering, Electrical & Electronic

Optimized Energy and Information Relaying in Self-Sustainable IRS-Empowered WPCN

Bin Lyu et al.

Summary: This paper proposes a hybrid-relaying scheme with an IRS to optimize both downlink energy transfer and uplink information transmission in a WPCN. By using TS and PS schemes, the IRS's phase shifts and network resource allocation are jointly optimized to maximize the sum-rate. Through numerical results, significant system sum-rate gain is demonstrated compared to the baseline scheme without IRS.

IEEE TRANSACTIONS ON COMMUNICATIONS (2021)

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Article Engineering, Electrical & Electronic

Terahertz Multi-User Massive MIMO With Intelligent Reflecting Surface: Beam Training and Hybrid Beamforming

Boyu Ning et al.

Summary: Terahertz (THz) communications offer wider bandwidth but face challenges of path attenuation and diffraction due to the short length of THz waves. By combining MIMO and IRS techniques, and implementing a cooperative beam training scheme, the obstacles of propagation loss and low-cost beamforming can be addressed effectively.

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY (2021)

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Article Engineering, Electrical & Electronic

Physics-Based Modeling and Scalable Optimization of Large Intelligent Reflecting Surfaces

Marzieh Najafi et al.

Summary: To optimize large intelligent reflecting surfaces (IRSs), a physics-based model and a scalable optimization framework are proposed in this article. By partitioning IRS unit cells into subsets and optimizing each subset in two stages, offline design and online optimization, efficiency can be improved for optimizing large IRSs.

IEEE TRANSACTIONS ON COMMUNICATIONS (2021)

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Proceedings Paper Imaging Science & Photographic Technology

A Massive MIMO Signal Detection Method Based on ZF Method

Yunlong Liu

Summary: The 5th generation communication technology, 5G, is crucial to major economies worldwide, with significant investment in communication technology. However, challenges arise in the core 5G technology, Massive MIMO, particularly in efficiently calculating large-scale inverses. To address this, a novel zero-forcing method based on matrix inversion lemma and dismantling matrix has been proposed.

2021 5TH INTERNATIONAL CONFERENCE ON IMAGING, SIGNAL PROCESSING AND COMMUNICATIONS (ICISPC 2021) (2021)

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Proceedings Paper Computer Science, Information Systems

A Systematic Beam Broadening Method for Large Phased Arrays

Corentin Fonteneau et al.

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2021 JOINT EUROPEAN CONFERENCE ON NETWORKS AND COMMUNICATIONS & 6G SUMMIT (EUCNC/6G SUMMIT) (2021)

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Reconfigurable Intelligent Surfaces: Principles and Opportunities

Yuanwei Liu et al.

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IEEE COMMUNICATIONS SURVEYS AND TUTORIALS (2021)

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Multicell MIMO Communications Relying on Intelligent Reflecting Surfaces

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IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING (2020)

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Standalone-Intelligent Reflecting Surface Control Method Using Hierarchical Exploration by Beamwidth Expansion and Environment-Adaptive Codebook

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