A circuit-based RIS phase shift matrix built from tunable resistance and capacitance degrades tensor-based channel estimation versus the ideal DFT design, and longer training reduces the loss.
Intelligent reflecting surface: Practical phase shift model and beamforming optimization,
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Circuit-Based Modeling Approach for Channel Estimation in RIS-Assisted Communications
A circuit-based RIS phase shift matrix built from tunable resistance and capacitance degrades tensor-based channel estimation versus the ideal DFT design, and longer training reduces the loss.