OFDM modulation and adaptive equalization for underwater communications

• Autorzy: Kochańska I. , Lasota H. , Salamon R.
• Języki publikacji: EN

Abstrakty

EN

Transmission performances of a shallow underwater channel are limited due to multiple reflections of sound waves off the bottom and water surface, and to the non-stationarity caused mainly by water surface movement. In traditional narrowband telecommunication modems complex Decision Feedback Equalizers are used for minimizing the influence of intersymbol interferences caused by multipath propagation of sound waves. The article proposes adapting OFDM modulation and adaptive equalization based on Kalman filtration techniques for use in underwater communications system. The OFDM modulation is used in wideband ADSL telecommunication modems. The Kalman filtration algorithm is used for time-varying processes identification. The techniques were tested in simulation environment with promising results.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2005
• Tom: Vol. 8
• Strony: 77--82
• Opis fizyczny: Bibliogr. 5 poz., rys., tab.

Twórcy

autor

Kochańska I.

• Gdańsk University of Technology Faculty of Electronic Engineering, Telecommunications and Computer Science Department of Marine Electronic Systems G. Narutowicza 11/12, 80-952 Gdańsk

autor

Lasota H.

• Gdańsk University of Technology Faculty of Electronic Engineering, Telecommunications and Computer Science Department of Marine Electronic Systems G. Narutowicza 11/12, 80-952 Gdańsk

autor

Salamon R.

• Gdańsk University of Technology Faculty of Electronic Engineering, Telecommunications and Computer Science Department of Marine Electronic Systems G. Narutowicza 11/12, 80-952 Gdańsk

Bibliografia

• [1] J. G. Proakis, “Digital Communications”, McGraw-Hill Book Company, 1989.
• [2] R.E.Kalman, “A New Approach to Linear Filtering and Prediction Problems”, Transactions of the ASME, Vol. 82, 35-45, 1960.
• [3] M.K.Tsatsanic, G.B.Giannakis, “Modeling and Equalization of Rapidly Fading Channels”, International Journal of Adaptive Control and Signal Processing, Vol. 10, 159-176, 1996.
• [4] M. Niedźwiecki, “Identification of Time-varying Processes”, John Wiley & Sons, Ltd, 2000.
• [5] I.Budzińska, H. Lasota, R. Mazurek, „Adapting Telecommunications modems techniques for use in underwater communication systems”, Hydroacoustics, Vol 5/6, 285-292, 2003.