Method for feeding back codebook-based precoding matrix information in wireless communication system and device therefor

摘要

A method for feeding back codebook-based precoding matrix information by a receiving side includes estimating a channel through a receiving signal received from a transmitting side; selecting first and second precoding matrix indexes for indicating precoding matrices selected in a predefined codebook based upon said estimated channel; and transmitting said selected first and second precoding matrix indexes to said transmitting side, wherein said predefined codebook supports antenna patterns at the receiving side, precoder (W) in the predefined codebook is expressed as a multiplication of two precoding matrices (W1 and W2), W1 is constituted as an oversampled discrete Fourier transform (DFT) matrix by a diagonal matrix, an element which reflects a factor in accordance with an antenna pattern configuration of said receiving side is included, and said first precoding matrix index indicates a precoding matrix selected from W1 and said second precoding matrix index indicates a precoding matrix selected from W2.

主权项

1. A method for feeding back, by a receiving side, codebook based precoding matrix information in a wireless communication system, the method comprising:
estimating a channel through a signal received from a transmitting side; selecting a first precoding matrix index and a second precoding matrix index indicating precoding matrices selected from a predefined codebook based upon the estimated channel; and transmitting the selected first and second precoding matrix indices to the transmitting side, wherein the predefined codebook supports a plurality of antenna patterns at the receiving side and a precoder W in the codebook is represented by the product of two precoding matrices W1 and W2, wherein W1 is an oversampled discrete Fourier transform (DFT) matrix, is composed of a diagonal matrix and includes an element reflecting a factor according to an antenna pattern configuration of the receiving side, wherein W1 is configured asW1=[W~1⁡(n1)00φ⁡(n1)⁢W~1⁡(n2)], wherein {tilde over (W)}1(n) is an oversampled DFT matrix and φ(n) is the factor according to the antenna pattern configuration of the receiving side, and wherein the first precoding matrix index indicates a precoding matrix selected from W1 and the second precoding matrix index indicates a precoding matrix selected from W2.