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Research Article

Performance analysis of underwater acoustic communication based on beam diversity in deep water

심해에서의 빔 다이버시티를 이용한 수중음향통신 성능 분석

Donghyeon Kim1
,
Heejin Park1
,
J. S. Kim2∗
,
Joung-Soo Park3
,
Joo Young Hahn3
김 동현1
,
박 희진1
,
김 재수2∗
,
박 정수3
,
한 주영3
1한국해양과학기술원-한국해양대학교 해양과학기술전문대학원
2한국해양대학교 해양공학과
3국방과학연구소
∗Corresponding Author
30 November 2019. pp. 678-686
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Abstract

Underwater communication performance is degraded by the influence of Inter-Symbol Interference (ISI) due to multipath. Passive time reversal processing is the most effective technique for mitigating multipath, and the diversity combining method can be used to improve its performance. This paper analyzed communication performance using the beam diversity combining method, which combines signals obtained through the beam steering to various angles. Directions of arrival were estimated through the beam-time migration, which, in turn, was estimated from probe signals received by a vertical line array. The performance was analyzed based on the number and type of combinations among the estimated angles. In this paper, the data obtained from the Biomimetic Long range Acoustic Communications 2018 (BLAC18) experiment, which was conducted in the East sea, ~50 km east of Pohang, in October 2018, were used for the analysis. The output Signal to Noise Ratio (SNR) was used as communication indicators.

Keywords
Deep water
Passive time reversal processing
Diversity combining method
Biomimetic Long range Acoustic Communications 2018 (BLAC18)

수중에서는 다중 경로로 인한 인접 심볼 간 간섭의 영향으로 통신 성능이 저하되며, 수동형 시역전 처리는 다중 경로를 완화하기 위한 가장 효율적인 기법이다. 수동형 시역전 처리의 성능을 향상시키기 위해 다이버시티 결합 기법이 이용되고 있으며, 본 논문에서는 여러 각도로의 빔 조향을 통해 획득한 신호들을 결합하는 빔 다이버시티 결합 기법을 이용하여 통신 성능을 분석하였다. 수직 선 배열 센서에 수신된 탐침 신호로부터 추정한 빔-시간 그래프를 통해 음파의 전달 각도들을 추정하였으며, 추정된 각도 중 결합 개수 및 방식에 따른 통신 성능을 분석하였다. 분석을 위해 2018년 10월 포항 동방 해역에서 수행된 Biomimetic Long range Acoustic Communications 2018(BLAC18) 실험 데이터를 활용하였으며, 통신 성능 지표로써 출력 신호 대 잡음비를 이용하였다.

키워드
심해
수동형 시역전 처리
다이버시티 결합 기법
Biomimetic Long range Acoustic Communications 2018 (BLAC18)
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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 : 38
  • No :6
  • Pages :678-686
  • Received Date : 2019-09-10
  • Accepted Date : 2019-10-15
  • DOI :https://doi.org/10.7776/ASK.2019.38.6.678
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