Exploiting Direct Link in Dual-Hop AF Relaying for THz Wireless Systems

Abstract

This paper investigates the outage performance of terahertz (THz) wireless communication systems empowered with dual-hop amplify-and-forward (AF) relaying technology. In particular, the information transmission from source to destination is done via AF relay and via direct link. Considering that all the THz links are characterized by α – μ fading distribution with pointing errors, both closed-form outage probability (OP) expression and asymptotic OP expression in the high signal-to-noise ratio regime are derived. Exploiting high SNR OP expression, we present a system’s diversity order as a function of fading parameters and pointing errors pertaining to all THz links. The impact of all associated system and channel parameters is shown via numerical and simulation results.