Performance Analysis of Outdoor THz Links under Mixture Gamma Fading with Misalignment

TL;DR

This paper provides a comprehensive performance analysis of outdoor terahertz links considering mixture gamma fading and misalignment, deriving closed-form expressions and validating them with simulations.

Contribution

It introduces a detailed analytical framework for outdoor THz links incorporating MG fading and misalignment, with new closed-form formulas and asymptotic analysis.

Findings

Analytical expressions for BER, outage probability, and capacity are derived.

Simulation results closely match the analytical models.

Asymptotic behavior at high SNR is characterized with convergence conditions.

Abstract

The precision of link-level theoretical performance analysis for emerging wireless communication paradigms is critical. Recent studies have demonstrated the excellent fitting capabilities of the mixture gamma (MG) distribution in representing small-scale fading in outdoor terahertz (THz)-band scenarios. Our study establishes an in-depth performance analysis for outdoor point-to-point THz links under realistic configurations, incorporating MG small-scale fading combined with the misalignment effect. We derive closed-form expressions for the bit-error probability, outage probability, and ergodic capacity. Furthermore, we conduct an asymptotic analysis of these metrics at high signal-to-noise ratios and derive the necessary convergence conditions. Simulation results, leveraging precise measurement-based channel parameters in various configurations, closely align with the derived analytical equations.