Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Design of Physical Layer and Performance Analysis for MX-S2X, Ship Centric Direct Communication with the Mitigation of Multi-path Fading on Sea Environment

해상 다중경로 페이딩 극복을 위한 선박중심 직접통신(MX-S2X) 물리계층 설계 및 성능 분석

  • 류형직 ((주)코메스타) ;
  • 유해선 ((주)코메스타) ;
  • 김원용 ((주)코메스타) ;
  • 김부영 (선박해양플랜트연구소 해상디지털통합활용연계연구단) ;
  • 심우성 (선박해양플랜트연구소 해상디지털통합활용연계연구단)
  • Received : 2021.11.24
  • Accepted : 2021.12.20
  • Published : 2021.12.31
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Abstract

This paper presents the definition and importance of ship-centric direct communication concerning ship safety of maritime autonomous and unmanned ships. It also proposes the concept of MX-S2X communication based on high frequency for wide-bandwidth technology and describes the design and simulation result for the physical layer of MX-S2X. It considered high-speed communication as well as overcoming maritime multi-path fading required to be resolved in the marine environment. The physical layer of MX-S2X communication was designed to overcome the occurrence of error-floor caused by multi-path fading even with receiving sufficient signal strength. To this purpose, a performance analysis was conducted on the physical layer by applying the channel model of the actual maritime communication environment. As a result of the performance analysis of the MX-S2X physical layer, it was confirmed that the BER error-floor observed in the VDE physical layer test was overcome, and it operated within the SNR 2dB degradation range compared to the AWGN channel. It is expected that this will show enough performance suitable for short-distance ship-centered direct communication and can be used for direct communication of maritime autonomous ships, unmanned ships, and group navigation of themshortly.

본 논문은 자율운항 및 무인 기능이 요구되는 새로운 선박 안전 패러다임에 대응하여 선박중심 직접통신이라는 용어 정의 및 중요성을 제시하고, 고 주파수 기반의 광대역 통신기술을 활용하는 MX-S2X 통신 개념을 정의한다. 초고속 통신 기술의 해상 적용 시 극복해야 하는 해상 다중경로 페이딩을 고려한 MX-S2X 물리계층에 대한 설계 내용과 모의시험을 통한 검증 결과를 제시한다. 설계한 MX-S2X 통신의 물리계층은 충분한 세기의 신호가 수신됨에도 다중경로 페이딩의 영향에 따른 Error-floor 발생 극복을 목표로 설계하였다. 이를 입증하기 위하여 실제 해상 통신환경에 대한 채널 모델을 적용하여 물리계층에 대한 성능분석을 수행하였다. MX-S2X 물리계층의 성능 분석 결과 VDE 물리계층에서 관측되었던 BER Error-floor가 극복되고 AWGN 채널 대비 SNR 2dB 열화 범위 내에서 동작하는 것으로 확인되었다. 이는 근거리 해상통신 환경인 근거리 선박중심 직접통신에 적합한 성능을 보이며 추후 자율운항선박, 무인선 및 군집 선박 등의 직접통신에 활용 가능할 것으로 기대한다.

Keywords

Acknowledgement

본 논문은 해양수산부 해양수산과학기술진흥원의 지원을 받아 수행하는 "초고속해상무선통신망 무선설비다각화 및 통신연계기술개발 연구"(No.20210644, PMS4880)의 일부 내용임을 밝힙니다.

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