Collaborative interference avoidance technology in GEO‐LEO co‐existing satellite system

Summary Recently, the Low Earth Orbit (LEO) satellite and Geostationary Earth Orbit (GEO) satellites share the same frequency to enhance spectrum efficiency in response to the scarcity of spectral resources. However, overlapping coverage areas emerge when LEO‐GEO and LEO‐LEO beams cover the same gro...

Full description

Saved in:
Bibliographic Details
Published in:International journal of satellite communications and networking 2024-07, Vol.42 (4), p.257-272
Main Authors: He, Mengmin, Cui, Gaofeng, Wu, Mengjing, Wang, Weidong
Format: Article
Language:English
Subjects:
Avoidance
BPO
Collaboration
Continuous beams
GEO‐LEO coexisting
GEO‐LEO inter‐system interference
Interference
LEO intra‐system interference
Low earth orbits
Optimization
Satellites
SURS
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Summary Recently, the Low Earth Orbit (LEO) satellite and Geostationary Earth Orbit (GEO) satellites share the same frequency to enhance spectrum efficiency in response to the scarcity of spectral resources. However, overlapping coverage areas emerge when LEO‐GEO and LEO‐LEO beams cover the same ground area in the GEO‐LEO co‐existing satellite system. Thus, the GEO‐LEO inter‐system interference and the LEO intra‐system interference are generated, which leads to more severe and complex interference. To solve the co‐channel interference problem without sacrificing the performance of the LEO system, a collaborative interference avoidance technology is proposed for the GEO‐LEO co‐existing satellite system. Firstly, the LEO satellite and user regrouping strategy (SURS) is employed to effectively avoid severe co‐channel interference by changing service satellites. Then, based on regrouping satellite and user pairs, a proximal policy optimization (PPO)‐based deep reinforcement learning (DRL) method is adopted to realize further continuous beam pointing optimization (BPO) of the LEO user antenna and reduce the co‐channel interference. Finally, simulation results verify that the proposed scheme can achieve the goal of interference mitigation and continuous service.
ISSN:1542-0973
1542-0981
DOI:10.1002/sat.1511