Spatial-chirp Codebook-based Hierarchical Beam Training for Extremely Large-Scale Massive MIMO

Xu Shi, Jintao Wang, Zhi Sun +1

Extremely large-scale multiple-input multiple-output (XL-MIMO) promises to provide ultrahigh data rates in millimeter-wave (mmWave) and Terahertz (THz) spectrum. However, the spher…