Patent ID: 8331489

Claim:
A terminal comprising: a codebook storage unit configured to store a codebook including matrices: 1 2 ⁡ [ 1 1 1 1 1 1 - 1 - 1 1 - 1 1 - 1 1 - 1 - 1 1 ] , 1 2 ⁡ [ 1 1 - 1 - 1 1 1 1 1 - 1 1 1 - 1 - 1 1 - 1 1 ] , and ⁢ 1 2 ⁡ [ 1 - j 1 - j j 1 - j - 1 1 j 1 j j - 1 - j 1 ] ; a selector configured to select a target matrix from the stored matrices; and an information feedback unit configured to feed back information associated with the target matrix to a base station.