Beam Training and Alignment for RIS-Assisted Millimeter-Wave Systems: State of the Art and Beyond

Article Engineering, Electrical & Electronic

Fast Beam Training and Alignment for IRS-Assisted Millimeter Wave/Terahertz Systems

Peilan Wang et al.

Summary: This paper proposes an efficient downlink beam training/alignment method for IRS-assisted mmWave/THz systems, addressing the challenge of obtaining channel state information. By exploiting the sparse structure of the channel, the beam training problem is formulated as a sparse sensing and phaseless estimation problem, and an efficient solution is developed. Theoretical analysis and numerical results demonstrate the low training overhead and significant performance improvement of the proposed method.

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS (2022)

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Article Telecommunications

Channel Estimation for RIS Assisted Wireless Communications-Part II: An Improved Solution Based on Double-Structured Sparsity

Xiuhong Wei et al.

Summary: This paper proposes to reduce pilot overhead in RIS assisted wireless communication system by exploiting the double-structured sparsity of the angular cascaded channels among users, and introduces the double-structured orthogonal matching pursuit (DS-OMP) algorithm. Simulation results demonstrate that the pilot overhead required by the proposed scheme is lower than existing schemes.

IEEE COMMUNICATIONS LETTERS (2021)

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Article Engineering, Electrical & Electronic

Intelligent Reflecting Surface-Aided Wireless Communications: A Tutorial

Qingqing Wu et al.

Summary: Intelligent reflecting surface (IRS) is a technology that can alter wireless signal propagation in wireless networks by dynamically changing wireless channels to enhance communication performance. The future hybrid wireless network aided by IRS, comprising both active and passive components, is expected to achieve sustainable capacity growth cost-effectively.

IEEE TRANSACTIONS ON COMMUNICATIONS (2021)

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Article Engineering, Electrical & Electronic

Terahertz Massive MIMO With Holographic Reconfigurable Intelligent Surfaces

Ziwei Wan et al.

Summary: In the field of terahertz communication, holographic reconfigurable intelligent surfaces (RIS) can achieve holographic communication with practical hardware architecture and higher performance advantages. Meanwhile, for THz massive MIMO systems, a closed-loop channel estimation (CE) scheme is proposed to effectively estimate channels, and compressive sensing technique is introduced to reduce pilot overhead.

IEEE TRANSACTIONS ON COMMUNICATIONS (2021)

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Article Engineering, Electrical & Electronic