Receiving apparatus and receiving method

A receiving apparatus for receiving an orthogonal frequency division multiplexing (OFDM) modulated signal modulated based on an OFDM method, and generating decoded data obtained by decoding the OFDM modulated signal, the apparatus comprising:

• a quadrature demodulation unit configured to receive a signal obtained by converting said OFDM modulated signal into a predetermined frequency band, and perform quadrature demodulation on a time domain of said OFDM modulated signal to output a time domain signal;
• a window control unit configured to control a position of a fast fourier transform (FFT) window in which FFT is performed to said time domain signal outputted from said quadrature demodulation unit, and output FFT data corresponding to the FFT window;
• an FFT unit configured to perform FFT to said FFT data outputted from said window control unit, and output frequency domain data;
• and
• a data decoding unit configured to decode said frequency domain data outputted from said FFT unit, wherein
• said window control unit includes:
• a signal delaying unit configured to generate, from said time domain signal, a plurality of delay signals with different delay amounts;
• and
• a signal switching unit having a switch for outputting by switching between two signals different in delay amount by a single effective symbol in said time domain signal and said plurality of delay signals based on a predetermined switch timing, the signal switching unit being configured to output said FFT data including the output signal of the switch.

A receiving method for receiving an orthogonal frequency division multiplexing (OFDM) modulated signal modulated based on an OFDM method, and generating decoded data obtained by decoding the OFDM modulated signal, the method comprising:

• (a) a step of receiving a signal obtained by converting said OFDM modulated signal into a predetermined frequency band, and performing quadrature demodulation on a time domain of said OFDM modulated signal to output a time domain signal;
• (b) a step of controlling a position of a fast fourier transform (FFT) window in which FFT is performed to said time domain signal outputted in said step (a), and outputting FFT data corresponding to the FFT window;
• (c) a step of performing FFT to said FFT data outputted in said step (b), and outputting frequency domain data;
• and
• (d) a step of decoding said frequency domain data outputted in said step (c), wherein
• said step (b) includes:
• (e) a step of generating, from said time domain signal, a plurality of delay signals with different delay amounts;
• and
• (f) a step of outputting said FFT data including an output signal that has been outputted by switching between two signals different in delay amount by a single effective symbol in said time domain signal and said plurality of delay signals based on a predetermined switch timing.