User Pairing and Outage Analysis in Multi-Carrier NOMA-THz Networks

TL;DR

This paper develops a novel user pairing scheme and outage probability analysis for multi-carrier THz-NOMA networks, demonstrating performance gains over OMA and providing analytical tools for network design.

Contribution

It introduces a new user pairing scheme for THz-NOMA networks and derives outage probability expressions considering molecular absorption and fading effects.

Findings

Proposed user pairing scheme enhances NOMA performance over OMA.

Derived outage probability expressions match numerical simulations.

Simplified formulas for negligible thermal noise improve analysis efficiency.

Abstract

This paper provides a comprehensive framework to analyze the performance of non-orthogonal multiple access (NOMA) in the downlink transmission of a single-carrier and multi-carrier terahertz (THz) network. Specifically, we first develop a novel user pairing scheme for the THz-NOMA network which ensures the performance gains of NOMA over orthogonal multiple access (OMA) for each individual user in the NOMA pair and adapts according to the molecular absorption. Then, we characterize novel outage probability expressions considering a single-carrier and multi-carrier THz-NOMA network in the presence of various user pairing schemes, Nakagami-m channel fading, and molecular absorption noise. We propose a moment-generating-function (MGF) based approach to analyze the outage probability of users in a multi-carrier THz network. Furthermore, for negligible thermal noise, we provide simplified single-integral expressions to compute the outage probability in a multi-carrier network. Numerical results demonstrate the performance of the proposed user-pairing scheme and validate the accuracy of the derived expressions.