Receiver, method of reception, reception program, integrated circuit, and digital television

A reception method for receiving an OFDM (Orthogonal Frequency Division Multiplexing) signal, comprising the steps of:

• performing Fourier transform on the received OFDM signal on a symbol-by-symbol basis in a designated FFT (Fast Fourier Transform) window position, so as to obtain a transformed signal;
• estimating channel characteristics based on the transformed signal;
• and
• estimating, based on the channel characteristics, a plurality of ISI (Inter Symbol Interference) amounts that are each an amount of ISI occurring if the Fourier transform is performed in a corresponding one of FFT window position candidates, and designating, as the FFT window position, one of the plurality of FFT window position candidates that corresponds to a smallest estimated ISI amount.

A reception program causing a computer to receive and demodulate an OFDM (Orthogonal Frequency Division Multiplexing) signal, the process comprising the steps of:

• performing Fourier transform on the received OFDM signal on a symbol-by-symbol basis in a designated FFT (Fast Fourier Transform) window position, so as to obtain a transformed signal;
• estimating channel characteristics based on the transformed signal;
• and
• estimating, based on the channel characteristics, a plurality of ISI (Inter Symbol Interference) amounts that are each an amount of ISI occurring if the Fourier transform is performed in corresponding one of FFT window position candidates, and designating, as the FFT window position, one of the plurality of FFT window position candidates that corresponds to the smallest estimated ISI amount.

An integrated circuit for receiving an OFDM (Orthogonal Frequency Division Multiplexing) signal, comprising:

• a Fourier transform unit operable to perform Fourier transform on the received OFDM signal on a symbol-by-symbol basis in a designated FFT (Fast Fourier Transform) window position, so as to obtain a transformed signal;
• a channel characteristic estimation unit operable to estimate channel characteristics based on the transformed signal;
• and
• a window position control unit operable to estimate, based on the channel characteristics, a plurality of ISI (Inter Symbol Interference) amounts that are each an amount of ISI occurring if the Fourier transform is performed in a corresponding one of FFT window position candidates, and designate, as the FFT window position, one of the plurality of FFT window position candidates that corresponds to a smallest estimated ISI amount.

A digital television for displaying an image according to a signal obtained by receiving and demodulating an OFDM (Orthogonal Frequency Division Multiplexing) signal, comprising:

• a Fourier transform unit operable to perform Fourier transform on the received OFDM signal on a symbol-by-symbol basis in a designated FFT (Fast Fourier Transform) window position, so as to obtain a transformed signal;
• a channel characteristic estimation unit operable to estimate channel characteristics based on the transformed signal;
• and
• a window position control unit operable to estimate, based on the channel characteristics, a plurality of ISI (Inter Symbol Interference) amounts that are each an amount of ISI occurring if the Fourier transform is performed in a corresponding one of FFT window position candidates, and to designate, as the FFT window position, one of the plurality of FFT window position candidates that corresponds to a smallest estimated ISI amount.