Overlay Space-Air-Ground Integrated Networks with SWIPT-Empowered Aerial Communications

TL;DR

This paper analyzes overlay space-air-ground networks with SWIPT-powered aerial communications, deriving outage probabilities under various fading and interference scenarios, highlighting the importance of non-linear energy harvesting models for efficient network design.

Contribution

It introduces a comprehensive analytical framework for outage performance in OSAGINs with non-linear SWIPT energy harvesting, considering realistic fading and interference conditions.

Findings

Non-linear energy harvesting yields more accurate outage estimates.

Imperfect SIC scenarios significantly affect network performance.

Key parameters influence energy and spectrum efficiency in non-terrestrial networks.

Abstract

In this article, we consider overlay space-air-ground integrated networks (OSAGINs) where a low earth orbit (LEO) satellite communicates with ground users (GUs) with the assistance of an energy-constrained coexisting air-to-air (A2A) network. Particularly, a non-linear energy harvester with a hybrid SWIPT utilizing both power-splitting and time-switching energy harvesting (EH) techniques is employed at the aerial transmitter. Specifically, we take the random locations of the satellite, ground and aerial receivers to investigate the outage performance of both the satellite-to-ground and aerial networks leveraging the stochastic tools. By taking into account the Shadowed-Rician fading for satellite link, the Nakagami-\emph{m} for ground link, and the Rician fading for aerial link, we derive analytical expressions for the outage probability of these networks. For a comprehensive analysis of aerial network, we consider both the perfect and imperfect successive interference cancellation (SIC) scenarios. Through our analysis, we illustrate that, unlike linear EH, the implementation of non-linear EH provides accurate figures for any target rate, underscoring the significance of using non-linear EH models. Additionally, the influence of key parameters is emphasized, providing guidelines for the practical design of an energy-efficient as well as spectrum-efficient future non-terrestrial networks. Monte Carlo simulations validate the accuracy of our theoretical developments.