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Research Article

Survey on interference management for multibeam LEO satellite networks: Technology, challenges, and solutions
Wonjae Shin1
,
Jeonghun Park2
,
Hyungkeun Lee3*
1School of Electrical Engineering, Korea University, Seoul, Republic of Korea
2School of Electrical and Electronic Engineering, Yonsei University, Seoul, Republic of Korea
3School of Computer Information Engineering, Kwangwoon University, Seoul, Republic of Korea
*Corresponding Author
30 September 2024. pp. 19-26
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Abstract

In recent years, Low Earth Orbit (LEO) satellites have gained significant attention for cost-effective broadband internet services due to their wide coverage and low latency. Multi-beam transmission techniques have been developed to facilitate efficient frequency reuse and achieve high broadband transmission rates, similar to terrestrial cellular systems. However, increasing available bandwidth by assigning the same frequency band to multiple adjacent beams can lead to mutual interference, degrading overall system performance. Various research efforts have focussed on interference management strategies, particularly in the context of multiple antennas, to mitigate these challenges. This paper provides a comprehensive overview of multibeam LEO satellite systems and surveys the latest research on interference control in such systems. We explore advanced beamforming techniques designed to be robust with imperfect channel state information and discuss the application of rate-splitting multiple access (RSMA) to reduce interference further. In addition, we examine the integration of terrestrial and non-terrestrial networks, focusing on two types of systems: coordinated and cooperative approaches, along with several open problems and future research directions. This article highlights the critical role of interference management in enhancing the performance and reliability of multibeam LEO satellite communication systems.

Keywords
LEO satellite
Multibeam
RSMA (Rate-Splitting Multiple Access)
ISTN (Integrated Satellite-Terrestrial Networks)
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Information
  • Publisher :Korean Academy of Space Security
  • Publisher(Ko) :한국우주안보학회
  • Journal Title :JOURNAL OF SPACE SECURITY
  • Journal Title(Ko) :한국우주안보학회지
  • Volume : 1
  • No :1
  • Pages :19-26
  • Received Date : 2024-03-14
  • Revised Date : 2024-08-22
  • Accepted Date : 2024-08-30
  • DOI :https://doi.org/10.23386/joss.2024.1.1.002
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