Computer simulations are carried out to study the feasibility of an adaptive equalizer applied to an hydroacoustic data-transmission channel. The channel is examined with a comprehensive acoustical model to acquire worst-case examples of the ocean acoustic transmission channel. The equalizer performance is investigated by simulations with a computer-generated channel response. Equalizer behavior in a mobile time-variant environment is also studied by use of a simplified, time-discrete multipath channel model. A stochastic gradient lattice equalizer is simulated for a channel which varies due to movement of the transmitter platform. The equalizer was able to track a velocity of up to 0.4 m/s for a favorable transmission geometry, using a transmitter beamwidth of 10 degrees . The results demonstrate the feasibility of coherent modulation schemes for medium-distance ocean acoustic telemetry. It was found that small beamwidths are imperative in maintaining signal coherence and in facilitating adaptive equalization. In particular, narrow-beam transducers will reduce equalizer complexity as well as the frequency spread.
Simulations of an adaptive equalizer applied to high-speed ocean acoustic data transmission'
Simulationen eines Adaptiventzerrers für die Anwendung bei der akustischen Datenübertragung mit hoher Geschwindigkeit im Ozean
IEEE Journal of Oceanic Engineering ; 16 , 1 ; 32-41
1991
10 Seiten, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
SELBSTANPASSUNG , DATENUEBERTRAGUNG , UEBERTRAGUNGSRATE , UEBERTRAGUNGSKANAL , OZEANOGRAPHIE , SIMULATIONSMODELL , ANSPRECHZEIT , DYNAMISCHES VERHALTEN , STOCHASTIK , UNTERWASSERNACHRICHTENTECHNIK , DIGITALSIMULATION , ENTZERRUNG , FERNMESSUNG , UNTERWASSERSCHALL , AKUSTISCHE SIGNALVERARBEITUNG , ZUFALLSPROZESS
Ocean block equalizer watertight welding aboard cable ship
Tema Archiv | 1979
|Adaptive equalizer for digital cellular radio
Kraftfahrwesen | 1991
|A New Adaptive Equalizer Based on Gene SPILL Algorithm
IEEE | 2008
|