Patent ID: 8135080

Claim:
An OFDM receiver apparatus having a plurality of receiver circuits, wherein each of the receiver circuits comprising: a Fourier transform circuit configured to receive an OFDM signal transmitted by OFDM (Orthogonal Frequency Division Multiplexing), to perform Fourier transform on the OFDM signal after being orthogonally demodulated, and to output the frequency-domain OFDM signal; a delay amount detection circuit configured to detect a first delay amount of a transmission path from a scattered pilot information in the frequency-domain OFDM signal; and a window control circuit configured to determine whether an undesired wave is a preceding wave or a delay wave based on peak position information obtained from the frequency-domain OFDM signal converted by the Fourier transform circuit and OFDM signals in the previous and subsequent symbols, to determine whether the first delay amount detected by the delay amount detection circuit is proper or not, to invert a determination result of whether the undesired wave is the preceding wave or the delay wave and calculate a second delay amount from the first delay amount when the first delay amount is determined to be improper, and to set a position of a time window indicating a range of the OFDM signal to be converted with Fourier transform by the Fourier transform circuit using either the first delay amount or the second delay amount.