Parametric MLE channel estimation for active RIS with adaptive configuration and orthogonal codebook achieves near-optimal performance using minimal pilots and outperforms passive RIS in spectral efficiency.
Ris- aided near-field channel estimation under mutual coupling a nd spatial correlation,
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Parametric Channel Estimation and Design for Active-RIS-Assisted Communications
Parametric MLE channel estimation for active RIS with adaptive configuration and orthogonal codebook achieves near-optimal performance using minimal pilots and outperforms passive RIS in spectral efficiency.