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Algorithm and Experimental Verification of Underwater Acoustic Communication Based on Passive Time-Reversal Mirror

수동형 시역전에 기반한 수중음향통신 알고리즘 및 실험적 검증

Min-Jeong Eom1
,
J. S. Kim2*
,
Jung-Hong Cho3
,
Hoeyong Kim3
,
Il Sung4
엄 민정1
,
김 재수2*
,
조 정홍3
,
김 회용3
,
성 일4
2College of Ocean Science and Technology, Room 313, Department of Ocean Engineering, Korea Maritime and Ocean University
1LIG넥스원(주) Maritime연구소
2한국해양대학교 해양공학과
3(주)한화
4국방과학연구소
*교신저자. *Corresponding Author. 
30 November 2014. pp. 392-399
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Abstract

The underwater acoustic communication is characterized by doubly spread channels, which are the delay spread due to multiple paths and the doppler spread due to environmental fluctuations or a moving platform. An equalizer is used to remove the inter-symbol interferences that the delay spread causes, but an equalizer doesn't use an acoustic environment such as a multipath. However, a passive time-reversal mirror is simpler than an equalizer because a matched filter is implemented numerically at the receiver structure along with one-way propagation. In this paper, a passive time-reversal mirror is applied to remove interferences due to a multipath in sea-going experimental data in East Sea in Oct. 2010 and improved communication performance is confirmed. The performance is verified by comparing the signal-to-interference plus noise ratio before/after passive time-reversal mirror. It is also performed independently of the passive time-reversal mirror and adaptive equalizer and the bit error rate is compared to verify the performance of underwater acoustic communication.

Keywords
Underwater acoustic communication
Passive time-reversal mirror
Inter-symbol interference
Signal- to-interference plus noise ratio
Bit error rate

수중음향통신에서는 다중경로에 의한 지연확산 채널과 조류로 인한 자연적 유동 혹은 인위적인 플랫폼 이동 등으로 도플러 확산 채널이 발생한다. 이로 인하여 발생하는 인접 심볼 간 간섭을 제거하기 위하여 등화기가 사용되고 있으나 다중 경로 등의 음향 환경정보를 사용하고 있지 않다. 반면 수동형 시역전의 경우 한 방향 전파과정으로 산출한 채널응답특성의 수치적 정합필터를 통하여 자기 등화를 수행하게 되므로 등화기보다 비교적 단순한 알고리즘으로 간섭을 제거하는 특성을 갖는다. 본 논문에서는 2010년 동해에서 수행한 통신 실험의 실측 데이터에 수동형 시역전을 적용하여 다중경로로 인한 간섭을 제거하고, 통신성능이 향상됨을 보이고자 한다. 이를 검증하기 위하여 수동형 시역전의 적용 전/후의 신호 대 간섭 잡음비를 비교하고 분석한다. 또한 수동형 시역전과 적응형 등화기의 알고리즘을 각각 독립적으로 수행하여 비트오류율을 산출하고 이를 비교하여 수동형 시역전의 통신성능을 검증한다.

키워드
수중음향통신
수동형 시역전
인접 심볼 간 간섭
신호 대 간섭 잡음비
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 :6
  • Pages :392-399
  • Received Date : 2014-07-08
  • Revised Date : 2014-08-27
  • Accepted Date : 2014-09-18
  • DOI :https://doi.org/10.7776/ASK.2014.33.6.392
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