Transmitting apparatus, receiving apparatus, communication system, and communication method

A receiving apparatus that receives a transmission signal transmitted by a transmitting apparatus comprised of first circuitry including:

• a data dividing circuitry portion configured to divide data of one block into M divided data, M being equal to or larger than 2;
• M Fourier transform circuitry portions configured to perform Fourier transform processing for each of the M divided data and generate M data subjected to Fourier transform;
• M control processing circuitry portions configured to apply predetermined control processing to each of the M data subjected to the Fourier transform and generate the M data subjected to control processing;
• a combination processing circuitry portion configured to apply inverse Fourier transform processing to the M data subjected to the control processing and combine the M data subjected to the control processing into one signal;
• a transmission processing circuitry portion configured to apply predetermined transmission processing to the combined signal to convert the signal into the transmission signal;
• a candidate selecting circuitry portion configured to retain a predetermined number of control value candidates, one set of which includes M control values used in the control processing carried out by the M control processing circuitry portions, and select, as a selected candidate, one of the control value candidates based on power information of the transmission signal;
• and a control-signal generating circuitry portion configured to generate M control signals for setting the M control values included in the selected candidate respectively in the control processing circuitry portions corresponding thereto and input the control signals respectively to the control processing circuitry portions corresponding thereto, the receiving apparatus comprising:
• second circuitry including:
• a dividing circuitry portion configured to divide the transmission signal into the divided data;
• a control-processing removing circuitry portion configured to carry out release processing, which is processing in an inverse manner compared to processing performed by the transmitting apparatus, for each of the divided data;
• a demodulation processing circuitry portion configured to perform demodulation processing based on the data subjected to the release processing to generate demodulated signals and calculate demodulation errors of the demodulated signals;
• and
• a control-signal generating circuitry portion configured to retain removal control value candidates, which are control values used for the release processing, corresponding to the respective predetermined number of the control value candidates, generate, concerning all the retained removal control value candidates, control signals corresponding to the removal control value candidates, input the control signals to the control-processing removing circuitry portion, and acquire the demodulation errors corresponding to the removal control value candidates, select one removal control value candidate based on the demodulation error for each of the removal control value candidates, and instruct the demodulation processing circuitry portion to select the demodulated signal corresponding to the selected removal control value candidate and output the demodulated signal as a demodulation result.

A communication method comprising:

• dividing data of one block into M divided data, M being equal to or larger than 2;
• performing Fourier transform processing for each of the M divided data and generate M data subjected to Fourier transform;
• carrying out predetermined control processing for each of the M data subjected to Fourier transform;
• applying inverse Fourier transform processing to the M data subjected to the control processing and combining the M data subjected to the control processing into one signal;
• applying predetermined transmission processing to the combined signal to convert the signal into a transmission signal;
• retaining a predetermined number of control value candidates, one set of which includes M control values used in the control processing and selecting, as a selected candidate, one of the control value candidates based on power information of the transmission signal;
• and
• generating M control signals to set the M control values included in the selected candidate respectively corresponding thereto and outputting the generated M control signals respectively for said carrying out predetermined control processing for each of the divided data subjected to Fourier transform.