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2 Hydroacoustics

2 2003

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Detection on broadband signals in the field of aperture and array systems

Mazurek R., Lasota H., Budzińska I.

Hydroacoustics

2003

Vol. 6

275--284

Antennas and antenna arrays in low band underwater systems introduce significant linear distortions that affect the detection of broadband signals. The article gives an analysis of the distortions using the space-time impulse response method. The signal received at different directions is subjected to two types of filtration, one matched to the transmitted signal and another one matched to the distorted signal. For the purpose of the simulation the Matlab software was used. Detection performance can be greatly enhanced, if receiver design takes account of the distortions.

Adaptive telecommunications modems techniques for use in underwater communication systems

Budzińska I., Lasota H., Mazurek R.

Hydroacoustics

2003

Vol. 6

285--292

Underwater channel data transmission is one of telecommunications most difficult problems. One way to optimise the transmission may be by adapting transmission techniques used in telecommunications modems. The articles presents two ITU-T standards: V.34 and G.992.1, known as ADSL. The possibilities and limitations of these techniques for underwater communication systems are discussed. The ADSI standard using the DMT modulation seems to be the best.