SNR Maximization in Beyond Diagonal RIS-Assisted Single and Multiple Antenna Links

被引：14

作者：

Santamaria, Ignacio ^{[1
]}

Soleymani, Mohammad ^{[2
]}

Jorswieck, Eduard ^{[3
]}

Gutierrez, Jesus ^{[4
]}

机构：

[1] Univ Cantabria, Dept Commun Engn, Santander 39120, Spain

[2] Univ Paderborn, Signal & Syst Theory Grp, D-33098 Paderborn, Germany

[3] Tech Univ Carolo Wilhelmina Braunschweig, Inst Commun Technol, D-38106 Braunschweig, Germany

[4] IHP Leibniz Inst Innovat Mikroelekt, D-15236 Frankfurt, Oder, Germany

来源：

IEEE SIGNAL PROCESSING LETTERS | 2023年 / 30卷

关键词：

Reconfigurable intelligent surface; Takagi factorization; optimization; multiple antennas; multiple access channel; RECONFIGURABLE INTELLIGENT SURFACES;

D O I：

10.1109/LSP.2023.3296902

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：923 / 926

页数：4

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