Modeling and analysis of THZ communication systems

Abstract

In this thesis we propose multi-Relay dual-hop terahertz communication systems and multi- IRS assisted terahertz communication systems. With the imminent rollout of sixth generation (6G) and beyond wireless networks, Terahertz (THz) communication is emerging as a cornerstone for addressing the rapidly growing demands of high-speed data, ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC). Operating in the 0.1–10 THz frequency range, THz bands offer unprecedented spectrum availability, enabling ultra-high throughput and secure transmissions. However, the propagation characteristics at these frequencies pose significant challenges, including severe path loss, atmospheric absorption, molecular scattering, and beam misalignment—making direct, long-distance THz communication highly unreliable. This thesis addresses these issues by proposing and analyzing two distinct yet complementary system models: (i) multi-relay-enhanced dual-hop THz communication systems and (ii) multi-IRS-assisted THz communication systems. Both approaches aim to improve signal robustness, link reliability, and coverage in high-frequency environments.