A Spectrum Sharing Paradigm for GSO Satellite System and Radio Astronomy System

Yucheng Dai,Hlaing Minn

doi:10.1109/access.2019.2928299

Abstract

Geostationary orbit (GSO) satellite communication systems (SCSs) play an important role in nowadays satellite communication. Orbiting in the Clarke Belt, the GSO satellites provide voice, video, Internet access, and other data services to the users all over the world. The GSO SCSs are seeking for more spectrum resource to satisfy the growing demand of high downlink data rate, while the radio astronomy system (RAS) is suffering the inevitable radio-frequency interference (RFI) from the downlink of these GSO satellites. To solve the conflict between the GSO SCSs and the RAS in the spectrum allocation, we propose a spectrum sharing paradigm for the GSO SCS and the RAS with three potential RFI reduction methods. Depending on the radio astronomical observation (RAO) tasks of different observatories, the corresponding appropriate RFI reduction method combination can be chosen. Our analyses show that the proposed paradigm can guarantee most of the telescopes with the sample loss rate lower than 2% in both protected and unprotected RAS bands, while the SCS can obtain up to 13.88% extra average downlink throughput.

Highlights

Radio spectrum is a limited natural resource and its usage can be classified into two types – active wireless services which transmit and receive electromagnetic waves and passive wireless services which conduct signal reception only
In this paper, we investigated the effects of the Geostationary orbit (GSO) satellites on the Radio Frequency Interference (RFI) and sample loss rate of the Radio Astronomical Observation (RAO) using three bands of interests for Radio Astronomy System (RAS) as an example
The analyses showed that the RFI of the GSO satellites in the unprotected RAS band (e.g. 18.28 – 18.36 GHz) could be tens of dB above the detrimental RFI threshold of the RAO and could disrupt the RAO of the ground telescopes

Summary

INTRODUCTION

Radio spectrum is a limited natural resource and its usage can be classified into two types – active wireless services which transmit and receive electromagnetic waves and passive wireless services which conduct signal reception only. The results show that our proposed paradigm can lower the RAO sample loss rate of the telescopes in different RAS bands and offer more downlink bandwidth/throughput to the SCS in several scenarios. The RAS band I is assigned to satellites for space-to-earth (downlink) transmission and the telescopes may receive strong RFI while conducting RAO in this band. The unwanted emission power spectrum of the SCS downlink subbands is a key factor that shapes the RFI received by the ground telescopes.

10 Watt 100 MHz and keep this value for different

RFI FROM OTHER ACTIVE WIRELESS SYSTEMS

CELL-BASED BEAM SWITCH APPROACH TO SUPPRESS THE RFI

CONCLUSIONS