The radio frequency (RF) impairments of analog devices have been regarded as an important factor degrading the performance of Terahertz (THz) communications, where in-phase/quadrature (IQ) imbalance and phase noise (PN) are the two typical RF impairments at THz transceiver. In this paper, we investigate the channel estimation (CE) and equalization for THz receiver in the presence of wideband IQ imbalance and PN, where single-carrier frequency-domain equalization is used. Since PN is inserted between channel impulse response (CIR) and wideband IQ imbalance at the receiver, the CIR and IQ imbalance cannot be treated together as an effective channel. Therefore, a novel two-stage CE method is derived to separately estimate the CIR and wideband IQ imbalance parameters, and its corresponding channel equalization method is designed to compensate both wideband IQ imbalance and PN, and equalizes the CIR. Theoretical and simulation results validate the efficiency of our proposed CE, and the proposed equalization method is shown to outperform the state-of-the-art methods.

中文翻译：

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具有射频损伤的太赫兹接收器的信道估计和均衡


模拟设备的射频（RF）损伤被认为是降低太赫兹（THz）通信性能的重要因素，其中同相/正交（IQ）不平衡和相位噪声（PN）是太赫兹（THz）通信中两种典型的射频损伤。太赫兹收发器。在本文中，我们研究了存在宽带 IQ 不平衡和 PN 的情况下太赫兹接收器的信道估计 (CE) 和均衡，其中使用单载波频域均衡。由于 PN 插入在接收器处的信道脉冲响应 (CIR) 和宽带 IQ 不平衡之间，因此不能将 CIR 和 IQ 不平衡一起视为有效信道。因此，提出了一种新颖的两级CE方法来分别估计CIR和宽带IQ不平衡参数，并设计了相应的信道均衡方法来补偿宽带IQ不平衡和PN，并均衡CIR。理论和仿真结果验证了我们提出的 CE 的效率，并且所提出的均衡方法被证明优于最先进的方法。