수동 페이저 컨쥬게이션 수중음향통신 기법의 비트오류 영향 인자

Bit Error Parameters on Passive Phase Conjugation Underwater Acoustic Communication

  • 발행 : 2005.11.01

초록

수중음향채널의 다중경로에 의한 수신신호의 지연확산은 ISI (Inter-Symbol Interference)를 유발하여 수중음향 통신시스템의 성능을 저하시킨다. 본 연구에서 적용하는 수동 페이저 컨쥬게이션 기법은 신호대 다중경로 간섭 신호비를 크게 하여 다중경로에 의한 주파수 선택성을 경감시켜 ISI를 줄이는 다이버시티 통신기법이다. 신호 대 다중경로 간섭신호비의 개선과 이에 따른 주파수 선택성은 수동 페이저 컨쥬게이션에 적용하는 수신기 배열의 배열 센서 개수, 송수신기의 상대운동에 의해 좌우되며, 따라서 비트 오류특성이 결정된다. 본 연구에서는 이들의 특성을 수치모의 실험으로 해석하였다.

Time spread due to the multipath in underwater acoustic channel, induces ISI (Inter-Symbol Interference) which degrades the performance of the underwater acoustic communication system. The passive phase conjugation (PPC) which improves the signal to multipath interference ratio (SMR) and therefore reduces the frequency selectivity. is a diversity communication technique giving a less ISI under multipath fading channel. Its frequency selectivity depends on the number of receiver array sensors and time varying source to receiver range. In this study, frequency selectivity of the PPC and its effects on bit error of underwater acoustic communication is analyzed by numerical simulation.

키워드

참고문헌

  1. Milica Stojanovic, 'Recent Advance in High Speed Underwater Acoustic Communications,' IEEE Journal of Oceanic engineering, 21 (2), 125-136, 1996 https://doi.org/10.1109/48.486787
  2. Arthur B. Baggeroer, 'AcousticTelemetrv -Overview.' IEEE Journal of Oceanic Engineering, OE-9 (4), October 1984
  3. D. Billon and B. Quellec, 'Performance of High Data Rate Acoustic Underwater Communication Systems Using Adaptive Beamforming and Equalizing,' Proc. IEEE OCEANS 94, 507-512, 1994
  4. 김병철, I-Tai Lu,'OFDM 수중음향통신 신호처리 설계와 성능평가' 한국음향학회 학술대회 발표논문집, 23 (2(s)),487- 490,2004
  5. Aatares Parvulescu, 'Matched-signaI('MESS') Processing by the Ocean,' J. Acoust. Soc. Am., 98 (2), 943-960, 1995 https://doi.org/10.1121/1.413520
  6. David R. Dowling, 'Acoustic pulse compression using passive phase-conjugate processing,' J. Acoust. Soc. Am., 95 (3), 1450-1458, 1994 https://doi.org/10.1121/1.408482
  7. Daniel Rouseff, et al., 'Underwater Acoustic Communication by Passive-Phase Conjugation: Theory and Experimental Results,' IEEE I. Oceanic Engr. m 26 (4), 821-831, 2001 https://doi.org/10.1109/48.972122
  8. T. C. Yang, 'Differences Between Passive-Phase Conjugation and Decision-Feedback Equalizer for Underwater Acoustic Communications,' IEEE Journal of Oceanic Engineering, 29 (2), April 2004
  9. John A. Flynn, James A. Ritcey, Daniel Rouseff, and Warren L.J. Fox, 'Multichannel Equalization by Decision-Directed Passive Phase Conjugation: Experimental Results,' IEEE Journal of Oceanic Engineering, 29 (3), July 2004
  10. Hongbin Li, Duixian Liu, Jian Li. Petre Stoica, 'Channel order and RMS delay spread estimation with application to AC power line communications,' Digital Signal Processing 13, 284-300, 2003 https://doi.org/10.1016/S1051-2004(02)00030-1
  11. W. A. Kuperman, W. S. Hodgkiss, H. C. Song, T. Akal, C. Feria, and D. R. Jackson, 'Phase conjugation in the ocean : Experimental demonstration of an acoustic time-reversal mirror,' J. Acoust. Soc. Am., 103 (1), 25-40, 1998 https://doi.org/10.1121/1.423233