Receiving apparatus and method and program

A receiving method comprising the steps of:

• receiving, by a hardware preamble analyzer, a frame of Digital Video Broadcasting-Terrestrial 2 made up of an Orthogonal Frequency Division Multiplexing signal and analyzing a preamble contained in the received frame;
• detecting, by an offset detector, a first fine carrier frequency offset and a coarse carrier frequency offset on the basis of the analyzed preamble;
• executing, by a carrier frequency corrector, carrier frequency correction on an Orthogonal Frequency Division Multiplexing time domain signal;
• determining, by a determiner, whether the detection of said coarse carrier frequency offset has been completed;
• when the detection of said coarse carrier frequency offset is determined to be completed, outputting, by a control signal outputter, a control signal for feeding back a second fine carrier frequency offset detected on the basis of an Orthogonal Frequency Division Multiplexing frequency domain signal obtained by applying Fast Fourier Transform computation to an output of said carrier frequency corrector;
• and
• outputting, by said control signal outputter, when the detection of said coarse carrier frequency offset is determined to be completed, a control signal for feeding back a sampling error detected on the basis of said Orthogonal Frequency Division Multiplexing frequency domain signal to a sampler that samples said Orthogonal Frequency Division Multiplexing time domain signal.

A non-transitory computer-readable storage medium having computer readable program codes embodied in the computer readable storage medium that, when executed cause a computer to execute:

• receiving a frame of Digital Video Broadcasting-Terrestrial 2 made up of an Orthogonal Frequency Division Multiplexing signal and analyzing a preamble contained in the received frame;
• detecting a first fine carrier frequency offset and a coarse carrier frequency offset on the basis of the analyzed preamble;
• executing carrier frequency correction on an Orthogonal Frequency Division Multiplexing time domain signal obtained by quadrature demodulation on the basis of the detected first fine carrier frequency offset and the detected coarse carrier frequency offset;
• determining whether the detection of said coarse carrier frequency offset has been completed;
• when the detection of said coarse carrier frequency offset is determined to be completed, outputting a control signal for feeding back a second fine carrier frequency offset detected on the basis of an Orthogonal Frequency Division Multiplexing frequency domain signal obtained by applying Fast Fourier Transform computation to an output of said carrier frequency correction;
• and
• outputting, when the detection of said coarse carrier frequency offset is determined to be completed, a control signal for feeding back a sampling error detected on the basis of said Orthogonal Frequency Division Multiplexing frequency domain signal to a sampler that samples said Orthogonal Frequency Division Multiplexing time domain signal.

A receiving apparatus comprising:

• a hardware preamble analyzer configured to receive a frame of Digital Video Broadcasting-Terrestrial 2 made up of an Orthogonal Frequency Division Multiplexing signal and analyze a preamble contained in the received frame;
• an offset detector configured to detect a first fine carrier frequency offset and a coarse carrier frequency offset on the basis of the analyzed preamble;
• a carrier frequency corrector configured to execute carrier frequency correction on an Orthogonal Frequency Division Multiplexing time domain signal obtained by quadrature demodulation on the basis of the detected first fine carrier frequency offset and the detected coarse carrier frequency offset;
• a determiner configured to determine whether the detection of said coarse carrier frequency offset has been completed;
• and
• a control signal outputter configured, when the detection of said coarse carrier frequency offset is determined to be completed, to output a control signal for feeding back a second fine carrier frequency offset detected on the basis of an Orthogonal Frequency Division Multiplexing frequency domain signal obtained by applying Fast Fourier Transform computation to an output of said carrier frequency corrector,
• wherein, when the detection of said coarse carrier frequency offset is determined to be completed, said control signal outputter further outputs a control signal for feeding back a sampling error detected on the basis of said Orthogonal Frequency Division Multiplexing frequency domain signal to a sampler that samples said Orthogonal Frequency Division Multiplexing time domain signal.