Channel measurement method and precoding method and apparatus

Patent metadata

Field	Value
Publication number	US-12476674-B2
Application number	US-202318303067-A
Country	US
Kind code	B2
Filing date	Apr 19, 2023
Priority date	Oct 22, 2020
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A channel measurement method includes: receiving a plurality of reference signals in a plurality of first frequency domain units in a same time domain unit, where the plurality of reference signals may be respectively precoded by using precoding matrices corresponding to the first frequency domain units in which the plurality of reference signals are located, and precoding matrices corresponding to at least two different first frequency domain units in the plurality of first frequency domain units are different; generating a precoding matrix indicator (PMI) based on the plurality of reference signals, where the PMI indicates a plurality of codewords corresponding to a plurality of second frequency domain units, the plurality of second frequency domain units and the plurality of first frequency domain units belong to a same frequency domain resource, and the plurality of codewords may be used for determining a downlink channel; and sending the PMI.

First claim

What is claimed is:

1 . A channel measurement method, comprising:
receiving a plurality of reference signals in a plurality of first frequency domain units in a same time domain unit; precoding the plurality of reference signals respectively using precoding matrices corresponding to the plurality of first frequency domain units, wherein precoding matrices corresponding to at least two different first frequency domain units in the plurality of first frequency domain units are different; generating a precoding matrix indicator (PMI) based on the plurality of reference signals, wherein the PMI indicates a plurality of codewords corresponding to a plurality of second frequency domain units, and the plurality of second frequency domain units and the plurality of first frequency domain units belong to a same frequency domain resource; determining a downlink channel, based on the plurality of codewords; and sending the PMI.

2 . The method according to claim 1 , wherein the precoding matrix is a random semi-unitary matrix.

3 . The method according to claim 1 , wherein the precoding matrix is a product of a fixed beam matrix and a mutually unbiased bases (MUB) matrix, and the fixed beam matrix is a semi-unitary matrix whose different columns have a same beam directivity pattern.

4 . The method according to claim 1 , wherein the time domain unit is a sub-frame, the first frequency domain unit is a resource block (RB) or a subband, and the second frequency domain unit is an RB or a subband.

5 . An apparatus, comprising:
at least one processor, and a memory storing instructions for execution by the at least one processor; wherein, when executed, the instructions cause the apparatus to perform operations comprising: receiving a plurality of reference signals in a plurality of first frequency domain units in a same time domain unit, wherein the plurality of reference signals are respectively precoded by using precoding matrices corresponding to the first frequency domain units in which the plurality of reference signals are located, and precoding matrices corresponding to at least two different first frequency domain units in the plurality of first frequency domain units are different; generating a precoding matrix indicator (PMI) based on the plurality of reference signals, wherein the PMI indicates a plurality of codewords corresponding to a plurality of second frequency domain units, the plurality of second frequency domain units and the plurality of first frequency domain units belong to a same frequency domain resource, and the plurality of codewords are used for determining a downlink channel; and sending the PMI.

6 . The apparatus according to claim 5 , wherein the precoding matrix is a random semi-unitary matrix.

7 . The apparatus according to claim 5 , wherein the precoding matrix is a product of a fixed beam matrix and a mutually unbiased bases (MUB) matrix, and the fixed beam matrix is a semi-unitary matrix whose different columns have a same beam directivity pattern.

8 . The apparatus according to claim 5 , wherein the time domain unit is a sub-frame, the first frequency domain unit is a resource block (RB) or a subband, and the second frequency domain unit is an RB or a subband.

Assignees

• Huawei Tech Co Ltd

Inventors

• Meng Xin
• Yang Ye

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L25/03955

  in combination with downlink estimations, e.g. downlink path losses · CPC title

• H04L25/0226

  sounding signals per se · CPC title

• H04L25/0204

  of multiple channels · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title