NBA-OMP：宽带THz信道估计的近场波束分裂感知正交匹配追踪算法
NBA-OMP: Near-field Beam-Split-Aware Orthogonal Matching Pursuit for Wideband THz Channel Estimation
摘要：
第六代网络设想太赫兹（THz）波段作为关键的使能技术之一，因为它的超宽带宽。为了对抗严重的衰减，太赫兹无线系统采用大阵列，其中近场波束分裂（NB）严重降低信道捕获的准确性。与只检查窄带波束成形或远场模型的先前工作相反，我们通过NB感知正交匹配追踪（NBA-OMP）方法来估计宽带THz信道。我们设计了一个NBA字典的近场导向矢量利用相应的角度和距离偏差。我们的OMP算法解释了这种偏差，从而在事实上减轻了NB的影响。数值实验证明了所提出的信道估计技术在宽带THz系统中的有效性。
英文摘要：
The sixth-generation networks envision the terahertz (THz) band as one of the key enabling technologies because of its ultrawide bandwidth. To combat the severe attenuation, the THz wireless systems employ large arrays, wherein the near-field beam-split (NB) severely degrades the accuracy of channel acquisition. Contrary to prior works that examine only either narrowband beamforming or far-field models, we estimate the wideband THz channel via an NB-aware orthogonal matching pursuit (NBA-OMP) approach. We design an NBA dictionary of near-field steering vectors by exploiting the corresponding angular and range deviation. Our OMP algorithm accounts for this deviation thereby ipso facto mitigating the effect of NB. Numerical experiments demonstrate the effectiveness of the proposed channel estimation technique for wideband THz systems.
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