Patent ID: 7865144

Claim:
A method for determining, in a signal, a value of the frequency of a carrier and a value of the frequency of symbols carried by said carrier comprising the steps of: a) determining a characteristic of the signal at or around a first, a second, and a third point of a band of the signal spectrum, the first point corresponding to a first frequency, the second point corresponding to a second frequency lower than the first frequency, and the third point corresponding to a third frequency greater than the first frequency; b) displacing the first, second, and third points separately so that said characteristic of the signal at the second point is equal to said characteristic of the signal at the third point and that the quotient of the sum of said characteristics of the signal at the second and third points and of said characteristic of the signal at the first point is equal to a determined ratio, wherein the first point is displaced by a different frequency from the second and third points according to a result of determining said characteristics of the signal; and c) selecting as a value of the carrier, the first frequency and, as a value of the symbol frequency, the difference between the third and the second frequency.