Patent ID: 8942302
Filing Date: 2015-01-27
Classification: H04B,H04L

Abstract:
1. A method comprising: receiving, at a wireless terminal, a set of channel state information reference signals; determining, by the wireless terminal, based on the received set of channel state information reference signals, a precoding matrix that is a product of a first precoding matrix and a second precoding matrix, where the first precoding matrix has at least a representation in terms of a representation matrix, where the representation matrix is based on a matrix selected from a first codebook, and where the second precoding matrix is based on a second codebook; and transmitting, by the wireless terminal, a representation of at least one of the first precoding matrix and the second precoding matrix; wherein the product is a block-Kronecker product; wherein the block-Kronecker product of two matrices is a horizontal concatenation of a sequence of one or more matrix block products where each of the two matrices is composed of a sequence of one or more horizontally concatenated matrix blocks; wherein an i wherein the block-Kronecker product comprises: