The invention relates to a method based on interval of signals (DB), which consists of a first part (ET) of interval of signals modulated by a first modulation method (GFSK) and a second part of interval of signals modulated by a second modulation method (DMPSK). Said method consists in determining channel parameters (c (i)) relating to the second part of signal intervals modulated by the second modulation method using the first (ET) signal intervals (DB) with the aid of a received data signal (a(i)); (p(i)).
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