Compressive Cascaded Channel Covariance Sensing for UPA-Type RIS-Aided Dual-Wideband Systems

Ozen H., GÜVENSEN G. M.

IEEE Wireless Communications Letters, vol.14, no.11, pp.3610-3614, 2025 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 14 Issue: 11
  • Publication Date: 2025
  • Doi Number: 10.1109/lwc.2025.3599452
  • Journal Name: IEEE Wireless Communications Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Page Numbers: pp.3610-3614
  • Keywords: beam squint effect, cascaded channel covariance estimation, compressive covariance sensing, MIMO, RIS
  • Middle East Technical University Affiliated: Yes

Abstract

This letter introduces a novel cascaded channel covariance matrix (C-CCM) estimation method for millimeter wave (mmWave) uniform planar array (UPA)-type reconfigurable intelligent surface (RIS)-aided dual-wideband multiple-input multiple-output (MIMO) systems. We formulate C-CCM estimation as a compressive covariance sensing problem and propose a beam-squint-aware (BSA) cascaded covariance orthogonal matching pursuit (CC-OMP) algorithm. The CC-OMP estimates large-size spatial C-CCMs from small-size temporal covariance matrices derived from the received signals. Simulation results demonstrate the superiority of the CC-OMP over state-of-the-art approaches in terms of normalized mean square error (NMSE).