Patent ID: 7693035

Claim:
An OFDM receiving method for receiving a signal that has undergone Orthogonal Frequency Division Multiplexing (OFDM) and applying Fast Fourier Transform (FFT) processing to the receive signal to demodulate transmit data, comprising: extracting, at an OFDM symbol extraction unit, an OFDM symbol comprising a fixed number of sample data from the receive signal; obtaining a path of maximum power among multipath and a shift quantity S that corresponds to a delay time from a direct path to the path of maximum power; shifting, at an FFT processing position shifter, by S number of samples, a position at which the FFT processing of the OFDM symbol starts; applying the FFT processing to the OFDM symbol from the position to which the shift has been made; storing an OFDM symbol, which comprises a fixed number of items of sample data, in a buffer memory; and reading sample data out of the buffer memory in order from an address that conforms to the FFT-processing starting position to which the shift has been made, inputting the data to an FFT processing unit and, when the data has been read out to the end of the buffer, subsequently reading sample data out of the buffer from the beginning thereof and inputting the data to the FFT processing unit, thereby shifting the FFT-processing starting position.