Method and device for determining pre-coding matrix

Abstract

The embodiment of the invention discloses a method and device for determining a pre-coding matrix, which can determine a first-stage pre-coding matrix on the basis of instruction information of a space related matrix, which is fed back by a terminal, so as to implement three-dimensional pre-coding according to a channel state and improve channel capacity. The method comprises the steps of: by a base station, sending multiple groups of first reference signals, wherein the multiple groups of first reference signals correspond to multiple dimensions of an antenna array, and each group of first reference signals in the multiple groups of first reference signals is used for the terminal to estimate space related matrix information in the corresponding dimension; receiving the space related matrix information fed back by the terminal on the basis of the multiple groups of first reference signals; and according to the space related matrix information, determining the first-stage pre-coding matrix.

Description

technical field [0001] Embodiments of the present invention relate to the field of wireless communication, and more specifically, to a method and device for determining a precoding matrix. Background technique [0002] Massive Multiple-Input Multiple-Output (Massive MIMO for short) is an industry-recognized key technology for 5G (the 5th Generation mobile communication, fifth-generation mobile communication). In a Massive MIMO system, a significant increase in spectral efficiency is achieved by using a large-scale antenna array. With the increase of the number of antennas, the number of ports required for channel state information (Channel State Information, “CSI” for short) measurement is large, and the pilot overhead is very large. [0003] In Release 13 of Long Term Evolution ("LTE" for short) (Realease 13, "R13" for short), a two-stage precoding structure may be supported. The two-level precoding realizes spatial dimensionality reduction through the first-level precodi...

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Problems solved by technology

[0004] However, in the existing two-level precoding structure, the first-level precoding is a fixed vertical precoding, and the downtilt angle of the antenna is adjusted through analog beamforming so that the beam only changes in the vertical direction

This method cannot accurately match the channel state according to the user's channel space characteristics, so the channel capacity is not optimal.

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