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

Ozen H., GÜVENSEN G. M.

IEEE Wireless Communications Letters, cilt.14, sa.11, ss.3610-3614, 2025 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 14 Sayı: 11
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1109/lwc.2025.3599452
  • Dergi Adı: IEEE Wireless Communications Letters
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Sayfa Sayıları: ss.3610-3614
  • Anahtar Kelimeler: beam squint effect, cascaded channel covariance estimation, compressive covariance sensing, MIMO, RIS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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).