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Abstract
The sea is really a particular environment. Its properties are very
typical and it’s why a lot of scientists work on it in order to
determine its characteristics. The underwater acoustics is one of the
domain which are particularly studied, because of its importance in a
lot of applications, civilians and militaries. This is very useful also
because the ocean is totally opaque to the electro-magnetic waves. So,
the sound results to be the better mean to communicate under the
surface of the sea. But, even if it is at the moment the better way for
underwater communications, a lot of problems have been encountered as
soon as we tried to transmit data. One of the problems encountered is
about the distorsion of our data. Indeed, when you send a data under
the sea surface, a lot of parameters make that the data received is not
the same as the data sent. It is a big problem and we can’t do
differently. So, the only way is to process this data after receiving
it, trying to do the inverse of what has been done during the
communication, and so getting exactly what was sent. When we speak
about this, it seems very simple. But the knowledge it requires, about
the environment, the communications, for example, is so huge that it
rapidly becomes really difficult.