Patent ID: 9667378
Date: 2017-05-30
CPC Classifications: H04B,H04L

Claim:
1. A method in a first device arranged to report feedback information to a second device to affect content of a precoder matrix which is used by the second device in precoding information which is carried over a multiple-input, multiple output (MIMO) channel to the first device, the method comprising: generating a multi-part feedback signal representing a multi-part precoder matrix structure which is related to channel state information for the MIMO channel; transmitting to the second device over an uplink channel at least two different parts of the multi-part feedback signal with two respective different transmission granularities in time and frequency, the two different parts of the multi-part feedback signal each being a matrix or a vector, wherein both different parts of the multi-part feedback signal are transmitted at some times and frequencies but only one part of the multi-part feedback signal is transmitted at other times and frequencies; and wherein a first part of the two different parts of the multi-part feedback signal affects a polarization matrix and a second part of the two different parts of the multi-part feedback signal affects a beamforming vector of the precoder matrix.