Method and device for selecting precoding matrices based on representations of speed of related devices

摘要

Communication may be provided from a first communication device over a multiple-input-multiple-output (MIMO) wireless channel to a second communication device. More particularly, feedback may be received at the first communication device from the second communication device, with the feedback including a precoding matrix selection from the second communication device. A representation of a speed of the second communication device relative to the first communication device may be generated. Responsive to the representation of the speed of the second communication device indicating a speed that is greater than a selection threshold, a generalized precoding matrix may be selected that is different than a precoding matrix indicated by the precoding matrix selection from the second communication device. Related devices are also discussed.

主权项

1. A method providing communication from a first communication device over a muitiple-input- muitiple-output, MIMO, wireless channel to a second communication device in a closed loop MIMO communications system, the method comprising:
receiving feedback at the first communication device from the second communication device, wherein the feedback includes a precoding matrix selection from the second communication device; generating a representation of a speed of the second communication device relative to the first communication device; responsive to the representation of the speed of the second communication device indicating a speed that is greater than a selection threshold, selecting a generalized precoding matrix that is different than a precoding matrix indicated by the precoding matrix selection from the second communication device, and responsive to selecting the generalized precoding matrix, transmitting a data block from the first communication device over the MIMO wireless channel to the second communication device using the generalized precoding matrix, wherein a transmission mode of the MIMO wireless channel is closed loop when the feedback is received at the first communication device, and wherein a transmission mode of the MIMO wireless channel remains closed loop when the generalized precoding matrix is selected.