Patent ID: 9020058
Filing Date: 2015-04-28
Classification: H04B

Abstract:
1. A method, comprising: receiving in a mobile communication terminal from a base station a precoded Multiple-Input Multiple-Output (MIMO) signal, which comprises a first signal component transmitted by one or more first antennas of the base station at a first polarization, and further comprises a second signal component transmitted by one or more second antennas of the base station at a second polarization, different from the first polarization; estimating in the terminal a difference between respective signal magnitudes of the first signal component having the first polarization and the second signal component having the second polarization that have been received in the terminal, and calculating feedback information that requests the base station to precode subsequent MIMO signals with a precoding matrix that is specified as a function of the difference between the signal magnitudes; and transmitting the feedback information from the terminal.