Hierarchical Codebook Design and Analytical Beamforming Solution for IRS-Assisted Communication - Liu, Xiyuan; Wu, Qingqing; Hu, Die; Wang, Rui; Wu, Jun (IEEE transactions on wireless communications, 2024)
Keywords: Algorithms; Array signal processing; Arrays; Beamforming; Channel estimation; Complexity; Continuity (mathematics); continuous array factor; hierarchical codebook; Intelligent reflecting surface; MIMO communication; Misalignment; Phased arrays; Reconfigurable intelligent surfaces; Search algorithms; Sidelobes; Time complexity; Training; Wireless communication