Patent ID: 8630337

Claim:
A method for demodulating a modulated signal, comprising: receiving a signal modulated in n-PSK or n-APSK comprising a succession of symbols organized in frames, each frame comprising a header followed by blocks of data symbols separated by blocks of pilot symbols; pre-equalizing the header, pilot and data symbols; determining a phase of the headers and pilot blocks to predict an evolution of a signal phase; correcting a phase of the data symbols according to the predicted evolution of the signal phase; and equalizing the data symbols corrected in phase using a plurality of estimated equalization coefficients based on estimated or known symbols of the signal, wherein the pre-equalizing uses one of the estimated equalization coefficients used to equalize the data symbols and at least one of: another estimated equalization coefficient used to equalize the data symbols; and an inverse of another estimated equalization coefficient used to equalize the data symbols, wherein equalizing is performed using a first filter of FIR type and a second filter of FIR type coupled to respective inputs of a first adder, pre-equalizing being performed using a third filter of FIR type using equalization coefficients used by the first filter of FIR type, and a one-stage filter of IIR type using a main equalization coefficient of the second filter of FIR type, the third filter of FIR type and the filter of IIR type being coupled to respective inputs of a second adder.