Phase conjugation for underwater acoustic communications

• Autorzy: Jastrzębski S.
• Języki publikacji: EN

Abstrakty

EN

In this paper a multipath problem in shallow water acoustic channel and phase conjugation technology will be presented. Acoustic communications in shallow water had been a difficult problem due to the characteristics of the underwater acoustic channel. The shallow water channel is the environment which is of particular interest to many research workers and presents a number of challenges to the designers of communications systems. Underwater acoustic channels are characterized by multipath phenomenon whose characteristics are time varying. This is the major factor that limits underwater acoustic communications performance. Communication systems can be categorized as using either incoherent or coherent modulation strategies. This paper presents the phase conjugation technique, also called “time-reversal”, which is the subject of active research in many areas of acoustics. This is a new method for coherent underwater acoustic communication. Preliminary results confirm the potential utility of the phase conjugation in underwater acoustics with applications in underwater communications. This method effectively mitigates the multipath propagation and can be used to solve this problem.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2006
• Tom: Vol. 9
• Strony: 71--76
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Jastrzębski S.

• University of Technology and Agriculture in Bydgoszcz Kordeckiego 20, 85-225 Bydgoszcz, Poland,

Bibliografia

• [1] T.C. Yang, Differences Between Passive-Phase Conjugation and Decision-Feedback Equalizer for Underwater Acoustic Communications, IEEE Journal of Oceanic Engineering, vol. 29, no. 2, pp. 472-487, April 2004
• [2] T. Folegot, P. Billand, S. Tauvry, S. Hibral, L. Berniere, J. Rosny, D. Clorennec, J.G. Minonzio, C. Prada, M. Fink, B. Celestin, Design of a Time Reversal Mirror for Medium Scale Experiments, Oceans-Europe 2005, pp. 1210-1213, 2005
• [3] G.F. Edelmann, W.S. Hodgkiss., S Kim, W.A. Kuperman, H.C Song, T. Akal, Underwater acoustic communication using time reversal, Oceans 2001, Hawaii, pp. 2231-2235, 2001
• [4] H.C Song., P. Roux, T. Akal, G.F Edelmann, W. Higley, W.S. Hodgkiss, W.A. Kuperman, K. Raghukumar, M. Stevenson, Time reversal ocean acoustic experiments at 3.5 kHz: Applications to active sonar and undersea communications, High Frequency Ocean Acoustics, La Jolla, CA, 2004
• [5] S. Kim, W.A. Kuperman, W.S. Hodgkiss, H.C. Song, G. Edelmann, T. Akal, Echo-to-Reverberation enhancement using a time reversal mirror, JASA 115, pp. 1525-1531, 2004
• [6] H.C. Song, S. Kim, W.S. Hodgkiss, W.A. Kuperman, Environmentally adaptive reverberation nulling using a time reversal mirror, JASA 116, pp. 762-768, 2004
• [7] G.F. Edelmann, T. Akal, W.S. Hodgkiss, S. Kim, W.A. Kuperman, H.C. Song, An initial demonstration underwater acoustic communication using time reversal, IEEE Journal of Oceanic Engineering, vol. 27, pp. 602-609, 2002
• [8] W. A. Kuperman,W. S. Hodgkiss, H. C. Song, T. Akal, C. Ferla, D. R. Jackson, Phase conjugation in the ocean: Experimental demonstration of an acoustic time-reversal mirror,” J. Acoust. Soc. Amer., vol. 103, no. 1, pp. 25–40, 1998