Combating Distance Limitation in Sub-Terahertz Frequency Band for Physical Layer Security in UAV Communications

Increasing the transmission range of a signal in sub-Terahertz (0.1-10 THz) frequency band has been a challenge due to its vapor loss and molecular absorption. It is more challenging in unmanned aerial vehicle (UAV) communications because of dynamic network topology and weather conditions. However, there are many attempts to tackle this issue. Ultra-massive multiple input multiple output (MIMO) communication is studied in this paper and has been tested in an UAV communications scenario. Also, analysis and simulations are presented to illustrate the feasibility of improving the THz communications up to 60 meters in line of sight (LoS) and non-line of sight (NLoS) areas. Finally, an analysis for Secrecy Outage Probability is presented for 0.060.3 THz to illustrate the performance of a physical layer security added to sub-THz communication.