FIRST COMMUNICATION DEVICE AND METHODS PERFORMED THEREBY FOR TRANSMITTING RADIO SIGNALS USING BEAMFORMING TO A SECOND COMMUNICATION DEVICE

摘要

Method performed by a first communication device (201) for adapting a pre-coder used by a second communication device (202) to transmit radio signals using beamforming to a third communication device (203). The first communication device (201), the second communication device (202), and the third communication device (203) operate in a wireless communications network (200). The first communication device (201) adapts (301), over a single time period of transmission of the radio signals, the pre-coder used by the second communication device (202) to transmit the radio signals to the third communication device (203) using beamforming. The adapting (301) is based on a change, over the single time period, in a state of a channel used to transmit the radio signals. The state is measured by the second communication device (202).