Effective Beam Training for Near-Field Wideband Terahertz Extremely Large-Scale Arrays
Extremely large-scale array (XL-array) is envisioned as a key technology for future terahertz (THz) communication networks. However, the near-field beam split effect severely degrades beam training performance in wideband THz XL-array systems. In this letter, we reveal that the near-field array gain is considerably mor...