HYDROACOUSTICS
ANNUAL JOURNAL |
START | NEW VOL 20 | SEARCH | STATISTICS | PAS - GDANSK DIVISION |
pp. 119-126, vol. 14, 2011 Henryk Lasota Gdańsk University of Technology, Gdansk, Poland Iwona Kochańska Gdańsk University of Technology, Gdansk, Poland Key words: ultrasonic signal; real-time adaptation; Doppler power spectrum; OFDM Abstract: The underwater environment is tough and demanding as a communication channel for ultrasonic signals. The channel transmission characteristics in marine and inland waters
depend much on local bathymetry and changing weather conditions. The architecture and
performance of a reliable underwater acoustic communication (UAC) system should allow
real-time adaptation of its transmission parameters to a large variety of possible channel
characteristics. The paper presents an adaptation procedure based on the WSS-US statistical
model developed for wireless telecommunication systems. The channel is there characterized
by measurements of instantaneous channel impulse response being then a basis for estimation
of the channel statistical characteristics and extraction of related parameters in the phase of
communication handshake, and next used in the adaptive design of digital communication
system transmission settings recorded at the physical and link layers of the communication
protocol.
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