Patent ID: 8537658
Filing Date: 2013-09-17
Classification: H04B

Abstract:
1. A method for a wireless communication device to send a precoder matrix information to a base station, the method comprising: the wireless communication device sending a first representation of a first matrix chosen from a first codebook, wherein the first matrix is a N-by-N diagonal matrix with the k-th diagonal elements being σ1*exp(jπ(k−1)m/N), for k from 1 to N/2 and being σ2*exp(jπ(k−N/2−1)m/N) for k from N/2+1 to N, N being a number of antennas, m is an integer between 0 and N-1, and σ1, σ2 being complex valued scalars; the wireless communication device sending a second representation of a second N-by-R matrix chosen from a second codebook, with R being a number of spatial layers; wherein the first representation and the second representation together convey a precoder matrix as a matrix product of the first matrix and the second matrix.