Dear editor,rnTo satisfy the growing demand for high data-rate communications, multiple-input-multiple-output (MIMO) technology has been recognized as the most important and fundamental technology in 5th-Generation (5G) wireless communication networks [1].The future high-speed data networks rely on massive MIMO technology.For some special scenarios, the physical size constraints are no longer as strict as that in the cellular networks,allowing the size of the arrays to become relatively larger such as ships and unmanned aerial vehicles [2].As the data rate increases, the bandwidth of the traditional microwave frequency will no longer meet the requirements of the practical systems [3].Fortunately, the terahertz (THz) band enables us to utilize a larger bandwidth, a shorter wavelength, and a smaller antenna size.Except such many advantages, it still faces technical challenges [4, 5].THz array heavily relies on accurate channel estimation, the tiny error will damage performance.