Terahertz (THz)-band has been envisioned for the sixth generation wireless networks thanks to its ultra-wide bandwidth and very narrow beamwidth. Nevertheless, THz-band transmission faces several unique challenges, one of which is beam-split which occurs due to the usage of subcarrier-independent analog beamformers and causes the generated beams at different subcarriers split, and point to different directions. Unlike the prior works dealing with beam-split by employing additional complex hardware components, e.g., time-delayer networks, a beam-split-aware orthogonal matching pursuit (BSA-OMP) approach is introduced to efficiently estimate the THz channel and beamformer design without any additional hardware. Specifically, we design a BSA dictionary comprised of beam-split-corrected steering vectors which inherently include the effect of beam-split so that the proposed BSA-OMP solution automatically yields the beam-split-corrected physical channel directions. Numerical results demonstrate the superior performance of BSA-OMP approach against the existing state-of-the-art techniques.

翻译：太赫兹（THz）频段因其超宽带宽和极窄波束宽度而被视为第六代无线网络的关键技术。然而，太赫兹频段传输面临若干独特挑战，其中之一是波束分裂现象——由于子载波独立模拟波束成形器的使用，导致不同子载波生成的波束产生分裂并指向不同方向。不同于现有通过添加额外复杂硬件组件（如时延网络）处理波束分裂的方法，本文提出一种无需额外硬件的波束分裂感知正交匹配追踪（BSA-OMP）方法，用于高效估计太赫兹信道并设计波束成形器。具体而言，我们设计了一个由波束分裂校正导向矢量构成的BSA字典，该字典本身包含了波束分裂效应，使得所提出的BSA-OMP解决方案能够自动生成经波束分裂校正的物理信道方向。数值结果表明，BSA-OMP方法相较于现有先进技术具有优越性能。