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
收藏
页码：923 / 926
页数：4
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