• Title/Summary/Keyword: 적응 수동형 시역전

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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)

  • Eom, Min-Jeong;Kim, J.S.;Cho, Jung-Hong;Kim, Hoeyong;Sung, Il
    • The Journal of the Acoustical Society of Korea
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    • v.33 no.6
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    • pp.392-399
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    • 2014
  • 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.

Performance analysis and verification of underwater acoustic communication simulator in medium long-range multiuser environment (중장거리 다중송신채널 환경에서 수중음향통신 시뮬레이터 성능 분석 및 검증)

  • Park, Heejin;Kim, Donghyeon;Kim, J.S.;Song, Hee-Chun;Hahn, Joo Young
    • The Journal of the Acoustical Society of Korea
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    • v.37 no.6
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    • pp.451-456
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    • 2018
  • UAComm (Underwater Acoustic Communication) is an active research area, and many experiment has been performed to develop UAComm system. In this paper, we investigate the possibility of modifying and applying VirTEX (Virtual Time series EXperiment) to medium long range MIMO (Multiple-Input Multiple-Output) UAComm of about 20 km range for the analysis and performance prediction of UAComm system. Since VirTEX is a time-domain simulator, the generated time series can be used in HILS (Hardware In the Loop Simulation) to develop UAComm system. The developed package is verified through comparing with the sea-going FAF05 (Focused Acoustic Field 2005) experimental data. The developed simulator can be used to predict the performance of UAComm system, and even replace the expensive sea-going experiment.