Yuan, HangYang, NanYang, KaiHan, ChongAn, Jianping2024-02-06December 99781538647271http://hdl.handle.net/1885/313274We propose a novel hybrid beamforming (BF) scheme for the Terahertz (THz) wireless communication system over frequency selective channels. In the system, a multi-antenna base station which employs the sub-connected architecture adopts orthogonal frequency division multiplexing to serve a multi-antenna user. By building a wideband THz channel model, we design a beamsteering codebook searching algorithm for analog BF in which the channel state information of all subcarriers in the radio frequency domain is considered. We then design the digital BF by using the regularized channel inversion method for eliminating inter-band interference at the baseband. Numerical results demonstrate that our proposed hybrid BF scheme achieves a significant spectral efficiency advantage over the existing hybrid BF scheme which adopted the zero-forcing digital beamformer. The results also demonstrate that the spectral efficiency achieved by our proposed low-complexity scheme is very close to that achieved by the high-complexity fully digital BF scheme, especially when the average received power at the user is low.This work was supported by the National Natural Science Foundation of China under Grant 61771054 and Grant 61501028 and the China Scholarship Council.application/pdfen-AU© 2018 IEEE201910.1109/GLOCOM.2018.86478352022-10-02