Patent ID: 8036291

Claim:
A method of fast fading channel Fast Fourier Transform (FFT) trigger point tracking in an integrated services digital broadcasting (ISDB) receiver, said method comprising: inputting a signal in a fading channel comprising N Orthogonal Frequency Division Multiplexing (OFDM) symbols, wherein said N is a number; determining an average correlation result of a current time-domain sample of said signal and a previous time-domain sample taken previously of said signal; accumulating said average correlation result for at least one of said OFDM symbols; determining a peak of said average correlation result to obtain a peak position; identifying said peak position as a trigger point of said input signal; and comparing said peak position with a first trigger point to generate a trigger point error signal, wherein said first trigger point is set at the middle of a guard of at least one of said OFDM symbols to generate said trigger point error signal.