Method for acquiring downlink channel information, apparatus for acquiring downlink channel information, and network side device

摘要

The present application provides a method for obtaining downlink channel information, a method apparatus for obtaining downlink channel information, and a network side device. The method includes precoding weighting for each of the M CSI-RSs of the N subcycles, each subcycle carrying a measurement for carrying and transmitting M CSI-RSs. Step corresponding to the number of pilot subframes, transmitting M weighted CSI-RS for each subcycle to the UE, and corresponding to M CSI-RS for each subcycle transmitted by the UE Receiving M PMIs and M CQIs, wherein the M PMIs and M CQIs are based on a set of rank-1 precoding codebooks corresponding to a predetermined number of antennas by the UE. Obtaining M weighted CSI-RS separately, obtaining M signal-to-noise ratios of the UE downlink channel according to the M CQIs of each subcycle; and M PMIs and sub-cycles for each subcycle Obtaining M equivalent codebooks according to the weight of the precoding weight, and obtaining a covariance matrix according to the M signal-to-noise ratios of the downlink channel and the M equivalent codebooks. .