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   Articles with "ris phase" as a keyword



A Grey Wolf Optimiser (GWO)-Based RIS Phase Shift Design for a RIS-Assisted Multi-Antenna System

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recommendations! Published in 2024 at "IEEE Communications Letters"

DOI: 10.1109/lcomm.2024.3423013

Abstract: Reconfigurable Intelligent Surfaces (RIS) offer numerous interesting advantages, including the ability to dynamically rearrange wireless channels to enhance communication system performance. The design of RIS phase shift has received more attention, and the majority of… read more here.

Keywords: ris phase; design; phase shift; grey wolf ... See more keywords

DRL-Based RIS Phase Shift Design for OFDM Communication Systems

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recommendations! Published in 2023 at "IEEE Wireless Communications Letters"

DOI: 10.1109/lwc.2023.3242449

Abstract: This letter investigates a downlink orthogonal frequency division multiplexing (OFDM) transmission system aided by a reconfigurable intelligent surface (RIS). To reduce the system overhead and cost, we consider a 1-bit resolution and column-wise controllable RIS,… read more here.

Keywords: ris phase; phase shift; drl based; based ris ... See more keywords

Performance of Multi-RIS-Aided Cell-Free Massive MIMO: Do More RISs Always Help?

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recommendations! Published in 2024 at "IEEE Transactions on Communications"

DOI: 10.1109/tcomm.2024.3362973

Abstract: Cell free (CF) massive multiple-input multiple-output (mMIMO) is a promising technology in realizing beyond fifth generation (B5G) networks. Massive deployment of access points (APs) in a CF-mMIMO system increases the spectral efficiency, however it also… read more here.

Keywords: number; cell free; free massive; performance ... See more keywords

A 3D Geometry-Based Reconfigurable Intelligent Surfaces-Assisted mmWave Channel Model for High-Speed Train Communications

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recommendations! Published in 2024 at "IEEE Transactions on Vehicular Technology"

DOI: 10.1109/tvt.2023.3321645

Abstract: In this article, a 3D geometry-based millimeter-wave channel model is proposed for reconfigurable intelligent surface (RIS)-assisted high-speed train communications. Remarkably, the RIS is attached to surface of train window to guarantee the channel between RIS… read more here.

Keywords: high speed; phase optimization; geometry; ris phase ... See more keywords