A Review of Enabling Physical-Layer Technologies for Terahertz Communications

With the explosive growth of mobile data demand, the contradiction between rate demand and spectrum shortage has become increasingly prominent. High-frequency communication systems such as millimeter wave and terahertz have gradually entered people/s field of vision, and they have been applied to satellite communications because of their vast bandwidth. The bottleneck of wireless bandwidth and spectrum utilization has become a vital issue for future wireless mobile networks, so terahertz communication has been proposed as an essential part of 5G and future 6G mobile networks. This article mainly investigates the enabling physical layer's critical technologies under the background of terahertz communication, including the recent research and development trend of the high-frequency band and multi-antenna technology and coding technology. Finally, this article points out the challenges and research directions of the terahertz communication network's physical layer technology in the future.