Patent ID: 8050341

Claim:
A method for acquiring a target frequency of a multi-path signal, the multi-path signal comprising a first path signal and a second path signal, the method comprising the steps of: (a) an apparatus receiving the first path signal through a first path and receiving the second path signal through a second path; (b) the apparatus determining a target region, the target region being a portion of a second cyclic prefix in the second path signal and overlapping with a first cyclic prefix in the first path signal; and (c) the apparatus determining the target frequency according to the target region; wherein the step (b) is performed by the steps of: (b1) the apparatus selecting a first region and a second region from the second path signal, the first region comprises the target region, and the second region comprises an original region corresponding to the target region; (b2) the apparatus calculating the difference between the first region and the second region to generate a differential signal; and (b3) the apparatus determining the target region according to the differential signal, wherein a signal energy of the target region is small than a predetermined value.