SNR maximization in beyond diagonal RIS-assisted single and multiple antenna links

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URI: https://hdl.handle.net/10902/29771
ISSN: 1070-9908
ISSN: 1558-2361
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Autoría
Santamaría Caballero, Luis IgnacioAutoridad Unican; Soleymani, Mohammad; Jorswieck, Eduard; Gutiérrez Terán, Jesús
Fecha
2023-07-19
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© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publicado en
IEEE Signal Processing Letters, 2023, 30, 923-926
Editorial
Institute of Electrical and Electronics Engineers Inc.
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Palabras clave
Reconfigurable intelligent surface
Takagi factorization
Optimization
Multiple antennas
Multiple access channel
Resumen/Abstract
Reconfigurable intelligent surface (RIS) architectures not limited to diagonal phase shift matrices have recently been considered to increase their flexibility in shaping the wireless channel. One of these beyond-diagonal RIS or BD-RIS architectures leads to a unitary and symmetric RIS matrix. In this letter, we consider the problem of maximizing the signal-to-noise ratio (SNR) in single and multiple antenna links assisted by a BD-RIS. The Max-SNR problem admits a closed-form solution based on the Takagi factorization of a certain complex and symmetric matrix. This allows us to solve the max-SNR problem for SISO, SIMO, and MISO channels.
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