WIRELESS RECEIVER, WIRELESS TRANSMITTER, AND FEEDBACK METHOD

摘要

Provided are a wireless receiver, a wireless transmitter, and a feedback method, with which the amount of CQI feedback in a MIMO channel is resuced. A channel estimation section (103) estimates a channel matrix of each RB between each transmitting/receiving antenna and performs the eigenvalue-decomposition of the estimated channel matrices to obtain the eigenvalues and eigenvectors by using a received pilot signal. A feedback information generating section (104) averages the eigenvalues for each RB and converts the averaged eigenvalues into a CQI for each stream to obtain the average CQI of the entire transmission band of a k-th stream. Further, the feedback information generating section (104) calculates a relative value (Dk) between the average CQI of a first stream and the average CQI of the k-th stream and determines the number of quantization bits to be allocated to the CQI of each of the streams to generate CQI feedback information.