Terminal device, feedback information generation method, and base station device

A terminal device that is configured to perform MIMO transmission with a base station device, the terminal device comprising:

• channel estimation circuitry configured to estimate channel state information between the terminal device and the base station device;
• decomposition processing circuitry configured to perform a decomposition process for the channel state information to acquire first decomposition information which includes plural singular values and second decomposition information which includes plural right singular vectors which are respectively associated with the plural singular values;
• decomposition information replacement circuitry configured to mutually replace portions of the plural singular values to acquire first replacement information and further acquires second replacement information based on the first replacement information and the plural right singular vectors;
• radio transmission circuitry configured to notify the base station device of information based on the second replacement information;
• and
• conversion processing circuitry configured to perform a conversion process for the second replacement information to acquire second conversion information;
• wherein the radio transmission circuitry is configured to notify the base station device of the second conversion information as the information based on the second replacement information.