Long-range multiple-input-multiple-output underwater communication in deep water

Donghyeon Kim; Daehwan Kim; J. S. Kim; Joo Young Hahn

doi:10.7776/ASK.2021.40.5.417

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2021 Vol.40, Issue 5 Preview Page Next Page

Research Article

Long-range multiple-input-multiple-output underwater communication in deep water 심해에서의 장거리 다중입출력 수중통신

30 September 2021. pp. 417-427

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Abstract

Long-range communication in deep waters must overcome the low data rate due to limited bandwidth. This paper presents the performance of Multiple-Input-Multiple-Output (MIMO) system to increase the data rate. In MIMO system, communication performance is degraded by crosstalk between users and an adaptive passive Time Reversal Processing (TRP) is widely used to eliminate this. In October 2018, long-range underwater acoustic communication experiment was conducted in deep water (1,000 m ~) off the east of Pohang, South Korea. During the experiment, a vertical line array was utilized and communication signals modulated by binary phase shift keying and quadrature phase shift keying with a symbol rate of 512 sps were transmitted. To generate MIMO communication signals, received signals from ranges of 26 km and 30 km is synthesized. Compared to the conventional passive TRP, the adaptive passive TRP eliminates the crosstalk between users and achieves error-free performance with an increase of output signal-to-noise ratio. Therefore, two users separated by 4 km in range achieves an aggregate data rate of 1,024 symbols/s.

Keywords

Deep water

Long-range communication

Adaptive passive time reversal processing

Multiple-input- multiple-output

Biomimetic Long-range Acoustic Communication experiment 2018 (BLAC18)

심해 장거리 통신의 경우, 제한된 대역폭으로 인해 데이터 전송률이 낮아지는 한계가 있다. 본 논문에서는 데이터 전송률을 향상시킬 수 있는 방법인 다중입출력 수중통신 연구 결과를 제시한다. 단일 음원 환경과 달리 다중 음원 환경의 경우 다른 음원에 의한 간섭으로 통신 성능이 저하되며, 이를 제거하기 위해 적응형 수동 시역전 처리가 주로 사용되고 있다. 2018년 10월 포항 동방 수심 1,000 m 이상의 심해 해역에서 장거리 수중음향통신 해상실험이 수행되었다. 해상실험 동안 수직 선 배열이 활용되었으며, 512 sps의 binary phase shift keying와 quadrature phase shift keying 변조 신호가 송신되었다. 다중입출력 환경을 모사하기 위해 26 km와 30 km 거리의 데이터를 합성한다. 재래식과 적응형 수동 시역전 처리를 이용한 데이터 분석 및 비교를 통해, 적응형 신호 처리를 적용했을 때 다른 음원에 의한 간섭이 제거되어 0 %의 비트 오류율과 출력 신호 대 잡음비 증가의 효과를 확인하였다. 따라서 두 개의 음원을 가진 다중입출력 통신 성능 분석을 통해 두 배의 데이터 전송률 (1,024 sps)을 획득하였다.

키워드

심해

장거리 통신

적응형 수동 시역전 처리

다중입출력

Biomimetic Long-range Acoustic Communication experiment 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 : 40
No :5
Pages :417-427
Received Date : 2021-07-05
Accepted Date : 2021-08-04
DOI :https://doi.org/10.7776/ASK.2021.40.5.417

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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