Patent ID: 7720182
Filing Date: 2010-05-18
Classification: H04B,H04L

Abstract:
1. An apparatus for correcting a frequency offset in a satellite digital video broadcasting system using a satellite digital video broadcasting signal, comprising: a frequency response transform means for receiving the satellite digital video broadcasting signal and acquiring a plurality of frequency responses divided into a positive frequency part and a negative frequency part; a rotation/difference value calculation means for selecting one of the plurality of frequency responses inputted from the frequency response transform means and calculating a first area difference value indicating a difference in area between the positive frequency part and the negative frequency part without rotation for the selected frequency response, and calculating a second area difference value indicating a difference in area between the positive frequency component and the negative frequency component with rotation for the remaining frequency responses; a zero intersection point calculation means for dividing an average slope of a straight line formed by the first area difference value and the second area difference value by the first area difference value, and calculating a zero intersection point of an area difference value on the straight line; and a frequency offset estimation means for correcting the zero intersection point provided from the zero intersection point calculation means to thereby estimate the frequency offset.