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Mitigation of Inter-Symbol Interference in Underwater Acoustic Communication Using Spatial Filter

공간 필터를 이용한 수중음향통신의 인접 심볼 간 간섭 완화

Min-Jeong Eom
,
Ji-Sung Park
,
Yoon-Hee Ji
,
J. S.† Kim†
엄 민정
,
박 지성
,
지 윤희
,
김 재수††
Korea Maritime and Ocean University
한국해양대학교 해양공학과
†교신저자. †Corresponding Author. 
31 January 2014. pp. 48-53
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Abstract

The underwater acoustic communication (UAC) is characterized by doubly spread channel. It is included in the time-variant doppler shift and delay-time spreads due to multiple paths. To compensate such distorted signals, various techniques including time-reversal processing, spatial diversity, phase estimator, and equalizer are being applied. In this paper, a spatial filter based on the beamforming is proposed as a method to mitigate such inter-symbol interferences that are generated in time-varying multipath channels. The proposed technique realizes coherent communications by steering the direction of the desired signals and improves the performance of UAC by increasing the signal-to-interference plus noise ratio using the array gain.

Keywords
Underwater acoustic communication
Spatial filter
Beamforming
Coherent communication
ISI mitigation
Bit error rate

수중음향통신은 시변동성으로 인하여 도플러 편이를 발생하고, 다중경로로 인하여 지연 확산의 특성을 갖는다. 이러한 채널 특성은 인접 심볼 간 간섭을 발생시켜 통신 성능을 저하시킨다. 통신 성능을 개선하기 위하여 시역전, 공간 다이버시티, 위상 추정기 및 등화기 등과 같은 다양한 기법이 연구되고 있다. 본 논문에서는 시변동성 다중경로로 인한 인접 심볼 간 간섭을 완화하는 방법으로 빔 형성 기반의 공간 필터 기법을 제안한다. 제안된 기법은 원하는 신호 방향으로 빔을 조향하여 공간상의 신호를 분리하고, 배열 이득으로 신호 대 간섭 잡음비를 향상시키고 통신 성능을 개선한다.

키워드
수중음향통신
공간필터
빔 형성
Coherent 통신
인접 심볼 간 간섭 완화
비트오류율
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 33
  • No :1
  • Pages :48-53
  • Received Date : 2013-10-04
  • Accepted Date : 2013-11-20
  • DOI :https://doi.org/10.7776/ASK.2014.33.1.048
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