Patent ID: 7453956

Claim:
A method of searching for a target modulation in a signal, the method comprising performing the following for each of a plurality of hypothetical carrier timings: shifting signal values corresponding to the signal according to a relationship between the hypothetical carrier timing and a reference carrier timing by augmenting or reducing a set of signal values according to the relationship between the hypothetical carrier timing and a reference carrier timing; demodulating the shifted signal values according to the reference carrier timing to produce demodulated signal values; shifting the demodulated signal values according to the relationship of the hypothetical carrier timing and the reference carrier timing by augmenting or reducing a set of demodulated signal values according to the relationship of the hypothetical carrier timing and the reference carrier timing; and determining a correlation of the shifted demodulated signal values with the target modulation, wherein the method further comprises detecting the target modulation responsive to the determined correlations for the hypothetical carrier timings.