Millimeter-wave MIMO time-domain limited channel state information feedback method and millimeter-wave MIMO time-domain limited channel state information feedback device

The invention discloses a millimeter-wave MIMO time-domain limited channel state information feedback method and a millimeter-wave MIMO time-domain limited channel state information feedback device applicable to millimeter-wave multiple-input multiple-output (MIMO) communication. The method comprises the following steps: after a base station side transmits a training pilot frequency, a receiver side estimates time-domain channel state information; after the receiver side estimates channel state information, an estimated time-domain channel is mapped to a wavelet base to carry out sparse transformation, the channel at the moment is sparse, a dimension reduction matrix feebly correlated with the wavelet base is constructed by taking advantage of the sparse property, and a high-dimensional channel matrix is projected to a low-dimensional space; and finally, the low-dimensional matrix is quantified and then fed back to the base station side. As the number of time-domain taps has nothing to do with the subcarrier