Patent ID: 7706479

Claim:
An OFDM receiver for demodulating an OFDM signal including a pilot signal inserted in a frequency domain, comprising: a Fourier transformation circuit for performing Fourier transformation of the OFDM signal; a delay profile circuit for generating a delay profile of the pilot signal extracted from an output signal of said Fourier transformation circuit; an interpolation circuit for performing interpolation processing of the pilot signal extracted from the output signal of said Fourier transformation circuit in the frequency domain; a filter control circuit for controlling a filter characteristic of said interpolation circuit based on the delay profile; and a correction circuit for correcting a data signal extracted from the output signal of said Fourier transformation circuit using an output of said interpolation circuit, wherein the filter control circuit compares a guard interval of OFDM with a time lag between a main wave and an interference wave, determines whether the time lag is larger than the guard interval, calculates a power ratio of the main wave and the interference wave when the time lag is larger than the guard interval, and controls the filter characteristic of said interpolation circuit in accordance with the calculated power ratio of the main wave and the interference wave.