Patent Document ID: 20070237249
Application ID: 11710869
Patent Flag: 0

Claim One:
1. A method of COFDM demodulation of successive symbols of a signal received from a transmission channel, each symbol comprising first carriers modulated in phase and/or in amplitude conveying data which depend on the symbol and second reference carriers called pilots having their frequency positions varying at least partly from one symbol to the next symbol, at least one given carrier from among the second carriers corresponding, for each symbol, to the same pilot, the method comprising, for each symbol, a step of determining a first estimate of the transfer function of the channel for each carrier in a first set of carriers from among the first carriers of said symbol such that, for the frequency positions of the considered carriers, symbols different from said symbol comprise pilots, corresponding to a linear combination of second estimates of the transfer function of the channel determined for pilots at the frequency of said carrier, wherein the coefficients of the linear combination are determined in iterative fashion, a new value of at least one of the coefficients being equal to the sum of the last determined value of said coefficient and of a term comprising the product between an iteration step and an error term equal to the different between the second estimate determined for said given carrier of a symbol, which depends on the coefficient, and the first estimate determined for said given carrier of said symbol, the iteration step being determined in iterative fashion.