| 摘要 |
A method and device for acquiring precoding matrix indicator are provided by the present invention, which belongs to the communication technology field. Said method includes: according to the first channel information, acquiring a first rotation matrix (101); according to the first rotation matrix and an instant beamforming matrix/precoding matrix acquired currently, acquiring a first differential matrix (102); according to a first differential codebook and a pre-acquired first rank indicator, and in terms of a predefined quantizing rule, quantizing the differential matrix, and acquiring the differential precoding matrix indicator (103). Said device includes: a first rotation matrix acquiring module, a first differential matrix acquiring module and a differential precoding matrix indicator acquiring module. The present invention acquires the differential PMI according to the channel information, and uses the differential PMI to perform feedback, not only reduces the overhead, but also enhances the feedback accuracy. |
