CODE BOOK CONTROL METHOD, BASE STATION APPARATUS AND MOBILE STATION APPARATUS

摘要

This invention is directed to facilitation of selection of an optimum PMI according to a channel variation amount in a channel propagation path. In a method for controlling a code book, which comprises a plurality of DFT code books defining a precoding matrix that is to be selected when a base station apparatus (eNodeB) has a high correlation between antennas and which further comprises a plurality of random code books defining a precoding matrix that is to be selected when the base station apparatus (eNodeB) has a low correlation between the antennas, a channel variation amount in a channel propagation path is estimated and a constituent ratio between the DFT code books and the random code books included in the code book is adaptively changed based on the estimated channel variation amount.