Design and assessment of THz communications systems, which will form an essential part of 6G, require an understanding of the propagation channels the systems will operate in. This paper presents investigations of the channel characteristics in various scenarios at 145 GHz, which is the band currently envisioned for the first round of deployments. In particular, we review several extensive measurement campaigns performed by the University of Southern California in both outdoor and indoor environments. We present the measurement and evaluation methodology and sample results that illustrate the dominant propagation effects in different environments. We then summarize the parameters of the statistical channel models for path loss, delay dispersion, and angular dispersion. Based on these results, we find that even in NLoS (non-line-of-sight) situations, Gbit/s communications can be sustained over a 100 m distance; that (for an antenna gain of 20 dB), there is considerable delay dispersion, requiring tens of equalizer taps, and that angular dispersion is significant in both LoS and NLoS situations. The channel parameters can be thus used as a basis for system design and evaluation under realistic operating conditions.

中文翻译：

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太赫兹波段传播通道的定向分辨测量和建模


太赫兹通信系统将成为 6G 的重要组成部分，其设计和评估需要了解系统运行的传播信道。本文介绍了对 145 GHz（目前该频段）各种场景下的信道特性的研究预计第一轮部署。我们特别回顾了南加州大学在室外和室内环境中进行的几次广泛的测量活动。我们提出了测量和评估方法以及示例结果，说明了不同环境中的主要传播效应。然后我们总结了路径损耗、延迟色散和角度色散的统计信道模型的参数。基于这些结果，我们发现即使在NLoS（非视距）情况下，Gbit/s通信也可以维持超过100 m的距离； （对于 20 dB 的天线增益），存在相当大的延迟色散，需要数十个均衡器抽头，并且角度色散在 LoS 和 NLoS 情况下都很重要。因此，通道参数可以用作实际操作条件下系统设计和评估的基础。