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Dear editor,rnIn the development of 6G, terahertz communications [1] have attracted much attention owing to their potential for providing wireless broadband connections with even higher frequency resources.Furthermore, new transmission technologies have been widely considered for supporting future 6G systems [2].Specifically, the spatial modulation (SM) technique has been suggested in [3] for striking a balanced trade-off between spectral efficiency (SE) and transmission performance compared with traditional multiple-input multiple-output systems.SM can be also combined with orthogonal frequency division multiplexing (OFDM) for combating multi-path fading [4,5] while making flexible use of the frequency resources on the terahertz band in 6G wireless systems [6].