On the Impact of Mutual Coupling on RIS-Assisted Channel Estimation

Pinjun Zheng; Xiuxiu Ma; Tareq Y. Al-Naffouri

doi:10.1109/LWC.2024.3367913

On the Impact of Mutual Coupling on RIS-Assisted Channel Estimation

Pinjun Zheng^*, Xiuxiu Ma, Tareq Y. Al-Naffouri

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Amid the demand for densely integrated elements in techniques such as holographic reconfigurable intelligent surfaces (RISs), the mutual coupling effect has gained prominence. By performing a misspecified Cramér-Rao bound analysis within an electromagnetics-compliant communication model, this letter offers a quantitative evaluation of the impact of mutual coupling on RIS-assisted channel estimation. Our analysis provides insights into situations where mutual coupling can be disregarded safely. The analyses and numerical results reveal that within practical scenarios, closer integration of RIS elements or the enlargement of RIS size accentuates the impact of neglecting mutual coupling. In addition, even with mutual coupling-aware setups, excessively tight RIS element spacing can lead to substantial degradation in the channel estimation performance.

Original language	English (US)
Pages (from-to)	1275-1279
Number of pages	5
Journal	IEEE Wireless Communications Letters
Volume	13
Issue number	5
DOIs	https://doi.org/10.1109/LWC.2024.3367913
State	Published - May 1 2024

Bibliographical note

Publisher Copyright:
© 2012 IEEE.

Keywords

channel estimation
misspecified CramÃ©r-Rao bound
mutual coupling
Reconfigurable intelligent surface

ASJC Scopus subject areas

Control and Systems Engineering
Electrical and Electronic Engineering

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10.1109/LWC.2024.3367913

Cite this

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title = "On the Impact of Mutual Coupling on RIS-Assisted Channel Estimation",

abstract = "Amid the demand for densely integrated elements in techniques such as holographic reconfigurable intelligent surfaces (RISs), the mutual coupling effect has gained prominence. By performing a misspecified Cram{\'e}r-Rao bound analysis within an electromagnetics-compliant communication model, this letter offers a quantitative evaluation of the impact of mutual coupling on RIS-assisted channel estimation. Our analysis provides insights into situations where mutual coupling can be disregarded safely. The analyses and numerical results reveal that within practical scenarios, closer integration of RIS elements or the enlargement of RIS size accentuates the impact of neglecting mutual coupling. In addition, even with mutual coupling-aware setups, excessively tight RIS element spacing can lead to substantial degradation in the channel estimation performance.",

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author = "Pinjun Zheng and Xiuxiu Ma and Al-Naffouri, {Tareq Y.}",

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AB - Amid the demand for densely integrated elements in techniques such as holographic reconfigurable intelligent surfaces (RISs), the mutual coupling effect has gained prominence. By performing a misspecified Cramér-Rao bound analysis within an electromagnetics-compliant communication model, this letter offers a quantitative evaluation of the impact of mutual coupling on RIS-assisted channel estimation. Our analysis provides insights into situations where mutual coupling can be disregarded safely. The analyses and numerical results reveal that within practical scenarios, closer integration of RIS elements or the enlargement of RIS size accentuates the impact of neglecting mutual coupling. In addition, even with mutual coupling-aware setups, excessively tight RIS element spacing can lead to substantial degradation in the channel estimation performance.

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On the Impact of Mutual Coupling on RIS-Assisted Channel Estimation

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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