Tutorial
Ning, Boyu; Yin, Haifan; Liu, Sixu; Deng, Hao; Yang, Songjie; Zhang, Yuchen; Mei, Weidong; Gesbert, David; Park, Jaebum; Heath Jr., Robert W; Björnson, Emil
Precoding matrix indicator in the 5G NR protocol: A tutorial on 3GPP beamforming codebooks
IEEE Communications Surveys and Tutorials, January 2026 / Also submitted to ArXiV, 8 January 2026