Gram-Schmidt process based adaptive time-reversal processing

Donghyeon Kim; Gihoon Byun; J. S. Kim; Kee-Cheol Shin

doi:10.7776/ASK.2024.43.2.184

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2024 Vol.43, Issue 2 Preview Page Next Page

Research Article

Gram-Schmidt process based adaptive time-reversal processing 그람슈미트 과정 기반의 적응형 시역전 처리

31 March 2024. pp. 184-199

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Abstract

Residual crosstalk has been considered as a major drawback of conventional time-reversal processing in the case of simultaneous multiple focusing. In this paper, the Gram-Schmidt process is applied to time-reversal processing to mitigate crosstalk in ocean waveguides for multiple probe sources. Experimental data-based numerical simulations confirm that nulls can be placed at multiple locations, and it is shown that different signals can be simultaneously focused at different probe source locations, ensuring distortionless responses in terms of active time-reversal processing. This focusing property is also shown to be much less affected by a reduction in the number of receivers than the adaptive time-reversal mirror method. The proposed method is shown to be effective in eliminating crosstalk in passive multi-input multi-output communications using sea-going data.

Keywords

Time-Reversal Processing (TRP)

Gram-Schmidt process

Crosstalk

Simultaneous multiple focusing

Nulling

잔여의 채널 간 간섭은 일반적인 시역전 처리 기반의 동시 다중 집속에서의 주요 문제점으로 고려되어진다. 본 논문에서는, 다수의 음원이 존재하는 수중 도파관환경에서의 채널 간 간섭을 완화하기 위해 그람-슈미트 과정을 시역전 처리에 적용하였다. 해상 실험 데이터 기반 수치 시뮬레이션을 통해 여러 위치로의 널 형성 및 서로 다른 음원의 위치에서의 각기 다른 신호의 왜곡 없는 동시 다중 집속이 가능함을 능동 시역전 처리 관점에서 검증하였다. 또한, 적응 시역전 처리 방법에 비해 수신기 개수의 감소에 상대적으로 적은 영향을 받는 것을 확인하였다. 제안된 알고리즘을 통해 수동 다중 입·출력 수중 통신에서의 채널 간 간섭이 효율적으로 제거됨을 해상 실험 데이터를 통해 보였다.

키워드

시역전 처리 (Time-Reversal Processing, TRP)

그람-슈미트 과정

채널 간 간섭

다중 동시 집속

널링

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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 : 43
No :2
Pages :184-199
Received Date : 2023-12-06
Accepted Date : 2024-01-15
DOI :https://doi.org/10.7776/ASK.2024.43.2.184

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

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