Wideband THz Beam Tracking Based on Integrated Sensing and Communication System

Terahertz (THz) Integrated sensing and communication (ISAC) is viewed as one of the most promising technologies for future 6G wireless communications, which can simultaneously enable data transmission at terabits-per-second (Tbps) rates and millimeter-level accurate sensing. To meet the communication requirements of high-mobility users, an efficient beam tracking method is crucial. However, existing beam tracking methods have a high beam training overhead and cannot cope with the severe performance loss caused by the beam split effect under the wideband system. In this letter, we propose a wideband THz beam tracking method based on the ISAC system, which introduces the time-delay network in the precoding to cope with the challenge of the beam split effect and reduce the beam training overhead with the aid of radar sensing. Simulation results show that the method can achieve near-optimal sum-rate performance with only little beam overhead compared to conventional methods.