Patent ID: 9252992
Filing Date: 2016-02-02
CPC Classification: H04B,H04L

Claim Text:
1. A method for multi-antenna transmission, comprising: selecting, by a receiving end device, a first precoding matrix indicator which identifies a first precoding matrix having a block diagonal structure in which each block is a Hermitian matrix and a second precoding matrix indicator; and feeding back, by the receiving end device, the first precoding matrix indicator and the second precoding matrix indicator to a sending end device, so that the sending end device determines a third precoding matrix according to the first precoding matrix indicator, the second precoding matrix indicator, and an obtained rank indicator (RI), and precodes data to be transmitted using the third precoding matrix, wherein the third precoding matrix is a function of the first precoding matrix and a second precoding matrix, and the second precoding matrix is identified by the second precoding matrix indicator, and a sub-matrix corresponding to a block of the first precoding matrix is R wherein where θ and φ represent angular values, where θ−2kπ and φ−2kπ are uniformly quantized between where k is an integer and N is a positive non-zero integer.