User equipment mobility is one of the primary challenges for the design of reliable and efficient wireless links over millimeter-wave and terahertz bands. These high-rate communication systems use directional antennas and therefore have to constantly maintain alignment between transmitter and receiver beams. For terahertz links, envisioned to employ radiation patterns of no more than few degrees wide, not only the macro-scale user mobility (human walking, car driving, etc.) but also the micro-scale mobility – spontaneous shakes and rotations of the device – becomes a severe issue. In this paper, we propose a mathematical framework for the first-order analysis of the effects caused by micro-mobility on the capacity and outage in terahertz communications. The performance of terahertz communications is compared with and without micro-mobility illustrating the difference of up to 1 Tbit/s or 75%. In response to this gap, it is finally shown how the negative effects of the micro-mobility can be partially addressed by a proper adjustment of the terahertz antenna arrays and the period of beam realignment procedure.

中文翻译：

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具有用户微移动性和光束未对准的太赫兹通信的容量和中断

用户设备移动性是在毫米波和太赫兹频段上设计可靠且高效的无线链路的主要挑战之一。这些高速通信系统使用定向天线，因此必须不断保持发射器和接收器波束之间的对齐。对于太赫兹链路，设想采用不超过几度宽的辐射模式，不仅是宏观尺度的用户移动性（人类步行、汽车驾驶等），而且还有微观尺度的移动性——设备的自发抖动和旋转– 成为一个严重的问题。在本文中，我们提出了一个数学框架，用于对微移动性对太赫兹通信中的容量和中断造成的影响进行一阶分析。太赫兹通信的性能在有和没有微移动性的情况下进行了比较，表明差异高达 1 Tbit/s 或 75%。针对这一差距，最终展示了如何通过适当调整太赫兹天线阵列和波束重新对准程序的周期来部分解决微移动性的负面影响。