METHOD FOR FEEDING BACK PRECODING MATRIX INDICATOR, RECEIVE END AND TRANSMIT END

摘要

The present disclosure provides a method for feeding back a precoding matrix indicator, a receive end and a transmit end, where the method includes: selecting, by a receive end, a precoding matrix W from a codebook based on a reference signal, where;W∈[X1(θ1)X2(θ2,ϕn)],;the θ1 and the θ2 indicate a phase difference of weighted values for signal transmission between two neighboring antennas in a first antenna group of a transmit end and a phase difference of weighted values for signal transmission between two neighboring antennas in a second antenna group of the transmit end, the φn indicates a phase difference of weighted values for signal transmission between the first antenna group and the second antenna group, where the signal transmission between the first antenna group and the second antenna group is for a same transmission layer,;ϕn=j2πnM,;and sending, by the receive end, a precoding matrix indicator PMI to the transmit end.

主权项

1. A method for feeding back a precoding matrix indicator, comprising:
selecting, by a receive end, a precoding matrix W from a codebook based on a reference signal, wherein the precoding matrixW∈[X1(θ1)X2(θ2,ϕn)],a matrix X1 is determined according to θ1, a matrix X2 is determined according to θ2 and φn, the θ1 indicates a phase difference of weighted values for signal transmission between two neighboring antennas in a first antenna group of a transmit end, wherein the signal transmission between the two neighboring antennas in the first antenna group is for a same transmission layer, the θ2 indicates a phase difference of weighted values for signal transmission between two neighboring antennas in a second antenna group of the transmit end, wherein the signal transmission between the two neighboring antennas in the second antenna group is for a same transmission layer, the φn indicates a phase difference of weighted values for signal transmission between the first antenna group and the second antenna group, wherein the signal transmission between the first antenna group and the second antenna group is for a same transmission layer, theϕn=j2πnM,the M is a positive integer, the n is a non-negative integer less than the M, θ1 and θ2 of at least one precoding matrix in the codebook are different, and the first antenna group and the second antenna group belong to a same multi-antenna system; and
sending, by the receive end, a precoding matrix indicator (PMI) to the transmit end, to enable the transmit end to determine the precoding matrix W according to the PMI.