HAPS-assisted Hybrid RF-FSO Multicast Communications: Error and Outage Analysis

TL;DR

This paper analyzes the performance of HAPS-assisted and satellite-assisted hybrid RF-FSO multicast communication systems, deriving outage probability, error rates, and capacity metrics, validated by simulations.

Contribution

It introduces two practical HAPS and satellite-based hybrid RF-FSO models for multicast networks, providing closed-form performance expressions and insights into their advantages.

Findings

Satellite-assisted models outperform in outage probability

HAPS-assisted models achieve higher energy efficiency

Closed-form expressions validate the models' accuracy

Abstract

In this work, we study the performance of multiple-hop mixed frequency (RF)/free-space optical (FSO) communication-based decode-and-forward protocol for multicast networks. So far, serving a large number of users is considered a promising approach for real-time applications to address the massive data traffic demands. In this regard, we propose two practical use-cases. In the former model, we propose a high altitude platform station (HAPS)-aided mixed RF/FSO/RF communication scheme where a terrestrial ground station intends to communicate with a cluster of nodes through two stratospheric HAPS systems. In the latter model, we assume that the line of sight connectivity is inaccessible between the two HAPS systems due to high attenuation caused by large propagation distances. Thereby, we propose a low Earth orbit satellite-aided mixed RF/FSO/FSO/RF communication. For the proposed scenarios, closed-form expressions of outage probability (OP) and bit error rate are derived. In addition, to illustrate the asymptotic behavior of the proposed models, diversity gains are obtained. Furthermore, ergodic capacity and energy efficiency (EE) are provided for both scenarios. Finally, the simulation results are provided to validate the theoretical derivations. The results show that satellite-aided mixed RF/FSO/FSO/RF scenarios achieve better OP, whereas HAPS-aided mixed RF/FSO/RF scenario can achieve higher EE.