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Although Terahertz communication systems can provide high data rates, itneeds high directional beamforming at transmitters and receivers to achievesuch rates over a long distance. Therefore, an efficient beam training methodis vital to accelerate the link establishment. In this study, we propose alow-complexity beam training scheme of terahertz communication system whichuses a low-cost small-scale hybrid architecture to assist a large-scale arrayfor data transmission. The proposed scheme includes two key stages: (1) coarseAoAs/AoDs estimation for beam subset optimization in auxiliary array stage, and(2) accurate AoAs/AoDs estimation by exploiting channel sparsity in datatransmission array stage. The analysis shows that the complexity of the schemeis linear with the number of main paths, and thus greatly reduces thecomplexity of beam training. Simulation results have verified the betterperformance in spectral efficiency of the proposed scheme than that of therelated work.

Efficient Multi-Beam Training For Terahertz Wireless communications