On the Influence of Spatial Characteristics on Fading Statistics of sub-THz Wireless Channels

Abstract:
This paper investigates the second-order fading statistics of sub-THz mobile radio channels. We focus on Level Crossing Rate (LCR), Average Fade Duration (AFD), Average Connection Time (ACT), Spatial Auto-covariance (SAV), and Coherence Distance (CD), using data from various measurement environments including indoor factories, outdoor urban microcells, industrial settings, and laboratory scenarios. By leveraging multipath shape factors and Rician fading models, we derive expressions for these fading metrics and analyze their dependence on angular dispersion and velocity. The study highlights significant variations in fading characteristics across different environments and frequencies, providing insights into the effects of angular spread, angular constriction, and multipath components on signal reliability. Our findings demonstrate the impact of angular dispersion on key metrics, offering valuable implications for the design and optimization of THz communication systems. This work contributes to a deeper understanding of sub-THz channel behavior, which is essential for developing robust and adaptive 6G communication networks.