Patent ID: 6944122
Filing Date: 2005-09-13
Classification: H04L

Abstract:
1. An OFDM demodulator for receiving an OFDM signal which has a plurality of OFDM symbols for transmitting data, each of the OFDM symbols being generated from a plurality of subcarriers including data carriers and pilot carriers which are assigned at constant frequency intervals, said OFDM demodulator comprising: a Fast Fourier Transformer (FFT) operable to convert each of the OFDM symbols of the OFDM signal into the plurality of subcarriers; a pilot carrier detector operable to detect the pilot carriers from the plurality of subcarriers of the OFDM symbol; a phase difference calculator operable to calculate phase differences between each of the detected pilot carriers of the OFDM symbol and known pilot carriers; a phase change amount calculator operable to calculate, based on the calculated phase differences, amounts of change of phase rotation between pairs of adjacent pilot carriers of the OFDM symbol with respect to a carrier frequency and a sampling frequency; and a phase corrector operable to correct a phase of each of the data carriers of the OFDM symbol, based on the calculated phase differences and the amounts of change.