S.M. Jesus and A. Silva sjesus@ualg.pt
, asilva@ualg.pt
SiPLAB-FCT, Universidade do Algarve
Faro, Portugal
Comments: download pdf file .
Ref.: Forum Acusticum, Sevilla, Spain, 2002(invited).
Abstract : Underwater acoustic communications in waveguides is
known
to be prone to severe multipath, which strongly limitates practical
transmission
rates with actual equalization techniques. The virtual Time Reversal
Mirror
(vTRM) principle uses the actual response of the ocean waveguide to
attempt
to reduce the multipath structure which, under ideal conditions, allows
for
environment independent signal extraction. One of the known limiting
factors
is the time stability of the acoustic channel. This paper focuses
essentially
in two aspects: one, is to demonstrate the potential application of the
vTRM
approach to undo the severe intersymbol interference in a real variable
geometry
channel scenario and, the other, is the variability of detection
performance
with symbol rate and source - array distance. The results obtained on
at-sea
recorded data during the INTIFANTE'00 sea trial will be shown to
support
the expectations.
ACKNOWLEDGMENT: this work was partially supported by projects INFANTE from FCT (Portugal) and LOCAPASS from FUP/MDN.