Patent ID: 8798195
Filing Date: 2014-08-05
Classification: H04B,H04L,H04W

Abstract:
1. A terminal apparatus comprising: a codebook storing section configured to store an extended codebook, which is generated by combining a first basic codebook and a second basic codebook along a column direction, wherein the first basic codebook includes N groups each consisting of four basic pre-coding column vectors that are orthogonal to each other (N is a natural number equal to or greater than 2), and wherein the second basic codebook is generated by applying phase offsets to the N groups, respectively, each of the phase offsets applied to the N groups being different from each other; and a feedback section configured to feed back to a base station an index (a pre-coding matrix indicator (PMI)) that identifies one pre-coding extended column vector from among the 4N pre-coding extended column vectors included in the extended codebook.