Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces: How It Works, State of Research, and The Road Ahead

@article{Renzo2020SmartRE,
  title={Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces: How It Works, State of Research, and The Road Ahead},
  author={Marco di Renzo and Alessio Zappone and M{\'e}rouane Debbah and Mohamed-Slim Alouini and Chau Yuen and Julien de Rosny and Sergei A. Tretyakov},
  journal={IEEE Journal on Selected Areas in Communications},
  year={2020},
  volume={38},
  pages={2450-2525}
}
Reconfigurable intelligent surfaces (RISs) are an emerging transmission technology for application to wireless communications. RISs can be realized in different ways, which include (i) large arrays of inexpensive antennas that are usually spaced half of the wavelength apart; and (ii) metamaterial-based planar or conformal large surfaces whose scattering elements have sizes and inter-distances much smaller than the wavelength. Compared with other transmission technologies, e.g., phased arrays… 
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TLDR
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TLDR
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TLDR
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System Performance Insights into Design of RIS-assisted Smart Radio Environments for 6G
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TLDR
Performance insights for design of RIS-assisted smart radio environments are provided by extending a recent system-level simulator and through extensive simulations, which investigates the impact of positioning/placement of RISs, the number of reflecting elements and the tilt/rotation of riss in both single and multi-RIS environments.
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Reconfigurable Intelligent Surfaces vs. Relaying: Differences, Similarities, and Performance Comparison
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The present paper elaborates on the key differences and similarities between RISs that are configured to operate as anomalous reflectors and relays and illustrates numerical results that highlight the spectral efficiency gains of RISs when their size is sufficiently large as compared with the wavelength of the radio waves.
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