On Performance of Fluid Antenna Relay (FAR)-Assisted AAV-NOMA Wireless Network

TL;DR

This paper analyzes the outage probability performance of a fluid antenna relay-assisted AAV-NOMA wireless system, introducing a novel model that enhances system reliability through advanced statistical analysis and relay schemes.

Contribution

It presents the first analytical outage probability expressions for FAR-assisted AAV-NOMA systems using Copula theory, and compares AF and DF relaying schemes under various conditions.

Findings

FAR-assisted systems outperform benchmarks without FAR.

Analytical models accurately predict outage probabilities.

Relay scheme effectiveness varies with FAR position and outage thresholds.

Abstract

In this paper, we investigate the performance of a fluid antenna relay (FAR)-assisted downlink communication system utilizing non-orthogonal multiple access (NOMA). The FAR, which integrates a fluid antenna system (FAS), is equipped on an autonomous aerial vehicle (AAV), and introduces extra degrees of freedom to improve the performance of the system. The transmission is divided into a first phase from the base station (BS) to the users and the FAR, and a second phase where the FAR forwards the signal using amplify-and-forward (AF) or decode-and-forward (DF) relaying to reduce the outage probability (OP) for the user maintaining weaker channel conditions. To analyze the OP performance of the weak user, Copula theory and the Gaussian copula function are employed to model the statistical distribution of the FAS channels. Analytical expressions for weak user's OP are derived for both the AF and the DF schemes. Simulation results validate the effectiveness of the proposed scheme, showing that it consistently outperforms benchmark schemes without the FAR. In addition, numerical simulations also demonstrate the values of the relaying scheme selection parameter under different FAR positions and communication outage thresholds.