| 摘要 |
The present invention is designed to easily adapt the structure of a codebook for precoding, by changing parameters, in downlink MIMO transmission using a plurality of transmitting antennas. A codebook adaptation method to adapt a codebook (13) for precoding applied to downlink MIMO transmission includes the steps of reporting the codebook size of the codebook, defined with a plurality of parameters pertaining to gain information and phase information, from one communication apparatus to another communication apparatus, and, at the other communication apparatus, adapting the structure of the codebook, based on the codebook size reported from the one communication apparatus. |
