Patent ID: 8406186

Claim:
A terminal device comprising: a receptor that receives a signal from a wireless base station; a measurement unit that measures, for each of frequency bands that have been determined in advance, reception quality of the signal received by said receptor; a judgment unit that determines, for each of said frequency bands, whether the reception quality measured by said measurement unit is greater than a first threshold value; a calculation unit that individually calculates, for each frequency band in which said reception quality is equal to or less than said first threshold value, an individual PMI for specifying a precoding matrix for compensating for channel distortion of that frequency band, and further, for frequency bands in which said reception quality is greater than said first threshold value, calculating a common PMI for specifying a precoding matrix for compensating for channel distortion common to those frequency bands; and a report unit that reports to said wireless base station the correspondence between said frequency bands and individual PMI and common PMI that were calculated in said calculation unit.