Guest Editorial: Channel Modeling and Signal Processing for Terahertz Communications.

Looking to 2030 and beyond, revolutionary enhancement of data transmission rates in sixth generation (6G) and beyond systems are required to meet the challenge of increasing communication traffic due to the massive exchange of information. Development of technologies and systems enabling terabit-per-second wireless communications need to support the long-term exponential capacity increase of mobile communication networks. Among the available frequency bands, the terahertz (0.1-10 THz) band has been identified as the most promising one to address the spectrum scarcity and capacity limitations of current wireless systems (although millimeter-wave communications have been officially adopted in recent 5G cellular systems). Furthermore, the unique properties of THz wave propagation enable novel sensing and localization capabilities. Since wireless channels are the foundation for designing a wireless communication system in the new spectrum and new environments, it is imperative to study the THz radio propagation channels for 6G future wireless communications.