Patent ID: 9270359
Filing Date: 2016-02-23
CPC Classification: H04B,H04L

Claim Text:
1. A method of controlling the polarization state of signals to be transmitted from a MIMO capable radio base station node of a cell to a plurality of user equipment, said radio base station node comprising a precoder unit connecting a first and a second virtual antenna port to a respective first and second transmit antenna port, the method comprising: controlling a relative phase between transmitted signals from said first transmit antenna port and said second transmit antenna port to provide a predetermined pair of orthogonal polarization states for signals transmitted on said first and said second virtual antenna ports; and interchanging the polarization states of said first and second virtual antenna ports by adapting said relative phase between said transmitted signals continuously in time, to provide transmitted polarized signals with cyclically alternating polarization states, wherein each of the interchanged polarization states is used for transmissions to at least one user equipment in the cell having a corresponding polarization state preference.