期刊
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
卷 24, 期 3, 页码 1670-1707出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/COMST.2022.3182539
关键词
Wireless communication; Wireless sensor networks; Antenna measurements; 6G mobile communication; Antenna arrays; Loss measurement; Channel models; Terahertz communications; channel measurements; channel simulators; channel models; channel characterization
资金
- National Key Research and Development Program of China [2020YFB1805700]
- Federal Ministry of Education and Research (BMBF, Germany) within the 6G Research and Innovation Cluster 6G-RIC [16KISK031]
This article provides a comprehensive overview of the study of THz wireless channels, including measurement methods, modeling methodologies, channel characteristics, and future research directions.
Terahertz (0.1-10 THz) communications are envisioned as a key technology for sixth generation (6G) wireless systems. The study of underlying THz wireless propagation channels provides the foundations for the development of reliable THz communication systems and their applications. This article provides a comprehensive overview of the study of THz wireless channels. First, the three most popular THz channel measurement methodologies, namely, frequency-domain channel measurement based on a vector network analyzer (VNA), time-domain channel measurement based on sliding correlation, and time-domain channel measurement based on THz pulses from time-domain spectroscopy (THz-TDS), are introduced and compared. Current channel measurement systems and measurement campaigns are reviewed. Then, existing channel modeling methodologies are categorized into deterministic, stochastic, and hybrid approaches. State-of-the-art THz channel models are analyzed, and the channel simulators that are based on them are introduced. Next, an in-depth review of channel characteristics in the THz band is presented. Finally, open problems and future research directions for research studies on THz wireless channels for 6G are elaborated.
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