Enhancing Spectrum Efficiency for Multiple Users in Hybrid Satellite-Terrestrial Networks

Nhat-Tien Nguyen,Ngoc-Long Nguyen,Miroslav Voznak,Dinh-Thuan Do,Hong-Nhu Nguyen,Anh-Tu Le

doi:10.1109/access.2021.3069247

Abstract

In the paper, we present a study on the performance analysis of a non-orthogonal multiple access (NOMA) underlay cognitive hybrid satellite-terrestrial relaying network (CSTRN) and highlight the performance gaps between multiple users. The satellite source communicates with users by enabling cognitive radio scheme to forward signals to secondary destinations on the ground which belong to dedicated groups following the principle of NOMA. In this scenario, the secondary source acts a relay and employs Amplify and Forward (AF) mode to serve distant NOMA users under a given interference constraint. To characterize the transmission environment, the shadowed-Rician fading and Nakagami- $m$ fading models are widely adopted to the relevant hybrid channels. To provide detailed examination of the system performance metrics, we aim to derive closed-form formulas for the outage probability of the secondary destinations in the presence of the primary interference power constraint imposed by the adjacent primary satellite network. Finally, our simulation results showed that a greater number of antennas, better quality of wireless channels and power allocation factors exhibit the main effects on system performance.

Highlights

Regarded as an attractive method for achieving high throughput with a broad coverage area, hybrid satellite systems and terrestrial networks can be integrated to form hybrid satellite terrestrial networks (HSTNs) [1]
This study aims to propose a framework of multiple non-orthogonal multiple access (NOMA) user in the cognitive hybrid satellite-terrestrial relaying network (CSTRN) system by exploiting set of analytical expressions to indicate the system performance metrics
If we increase the number of antennas at the satellite, such performance metrics show its improvement which demonstrating the benefits of introducing multiple antennas in the NOMACSTRN

Summary

Introduction

Regarded as an attractive method for achieving high throughput with a broad coverage area, hybrid satellite systems and terrestrial networks can be integrated to form hybrid satellite terrestrial networks (HSTNs) [1]. System performance can be achieved in the system models by employing cooperative relaying techniques which are reported in [3], [4]. Both the relaying network and cognitive radio (CR) technology can benefit to major applications of HSTNs by enhancing the efficiency of spectrum utilization. The promising architecture is studied as cognitive HSTN (CHSTN) [5]–[10]. In such a CHSTN, a secondary terrestrial network is permitted to operate in the same spectrum resource as the primary satellite network

Objectives

Results

Conclusion