Unlock instant, AI-driven research and patent intelligence for your innovation.

A feedback method and device for channel state information

A channel state information and feedback device technology, applied in the field of communication, can solve the problems of inaccurate channel quantization, differences between array channels without considering antennas, performance loss, etc.

Active Publication Date: 2021-01-22
DATANG MOBILE COMM EQUIP CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the above codebook structure designs the antenna array as a whole, without considering the channel differences between different parts of the antenna array
When the channel state information is fed back based on this codebook, due to the inaccurate quantization of the channel, a certain performance loss will be introduced.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A feedback method and device for channel state information
  • A feedback method and device for channel state information
  • A feedback method and device for channel state information

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0071]Seeimage 3 , The figure shows the channel state information feedback method, the execution subject of the method may be a terminal, the specific steps are as follows:

[0072]Step S301: Determine a first precoding matrix W in the first precoding matrix set1, And determine the first precoding matrix W1The corresponding index value of the first precoding matrix (i1,1,i1,2), where the first precoding matrix W1It is composed of beam groups used by multiple antenna groups of the antenna array;

[0073]Step S302: Determine a second precoding matrix W in the second precoding matrix set2, And determine the second precoding matrix W2Corresponding second precoding matrix index value (i2), where the second precoding matrix W2Including a beam selection part for beam selection of beam groups in each antenna group and a phase adjustment part for adjusting phases between multiple antenna groups;

[0074]Optionally, the first precoding matrix W1And the second precoding matrix W2Different feedback peri...

specific Embodiment approach 1

[0114]For a dual-polarized antenna array, a typical implementation is r1=1, the number of antenna elements in all antenna groups is the same, that is, N0=N1=...=NM-1.

[0115]In an optional manner, the relationship between the number of groups of the antenna array and the rank r of the precoding matrix satisfiesWhere r is the rank of the precoding matrix, M is the number of groups of the antenna array,Indicates rounding down.

[0116]In another optional manner, the relationship between the number of groups of the antenna array and the rank r of the precoding matrix is ​​as defined in Table 1.

[0117]Table 1: The relationship between the number of groups of the antenna array and the rank of the precoding matrix

[0118] Rank r of the precoding matrix Number of groups of antenna array M 12 22 34 44 58 68 78 88

[0119]In addition, it is better to assume that the beams used in each antenna group are taken from the same set of beam vectors, and each beam group XiNumber of beams included LiAll the ...

specific Embodiment approach 2

[0175]For dual-polarized antenna arrays, another better implementation is r1=2, the number of antenna elements in all antenna groups is the same, that is, N0=N1=...=NM-1.

[0176]As an example, the relationship between the grouping number of an antenna array and the rank of the precoding matrix is ​​defined in Table 3

[0177]Table 3: The relationship between the number of groups of the antenna array and the rank of the precoding matrix

[0178] Rank r of the precoding matrix Number of groups of antenna array M 12 22 32 42 54 64 74 84

[0179]In addition, it is better to assume that the beams used in each antenna group are taken from the same set of beam vectors, and each beam group XiNumber of beams included LiAll the same.

[0180]W1The structure is as follows:

[0181]W1A method similar to the first embodiment can be used. According to the foregoing discussion, preferably, each beam group contains mutually orthogonal beams, so beam group XiIt is different from the first embodiment. Assuming eve...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a channel state information feedback method and device, the feedback method includes: determining the first precoding matrix in the first precoding matrix set, and determining the first precoding matrix index corresponding to the first precoding matrix value; determine the second precoding matrix in the second precoding matrix set, and determine the second precoding matrix index value corresponding to the second precoding matrix, wherein the second precoding matrix includes The beam selection part in the beam selection and the phase adjustment part used for phase adjustment between multiple antenna groups; the first precoding matrix index value and the second precoding matrix index value are fed back to the access device, and the access device Using the first precoding matrix index value and the second precoding matrix index value, a corresponding precoding matrix is ​​selected from the first precoding matrix set and the second precoding matrix set and is used as a precoding matrix for data transmission after operation.

Description

Technical field[0001]The present invention relates to the field of communication technology, and in particular to a method and device for feedback of channel state information.Background technique[0002]In the Rel-10 version of the LTE (Long Term Evolution, Long Term Evolution) system, a two-level codebook is introduced for the 8 antennas at the base station. In the Rel-12 version, the 4 antennas at the base station are also enhanced to a two-level codebook. In the Rel-13 version, the base station uses FD MIMO (Full Dimension Multi-Input-Multi-Output, full-dimensional multiple-input multiple-output technology) antenna array (seefigure 1 withfigure 2 ), the antenna port is increased to 16, and it can be arranged in one or two dimensions.[0003]Based on the configuration of this antenna array, the codebook design is extended to a two-dimensional two-level codebook based on the original two-level codebook with 4 antennas and 8 antenna ports. This codebook structure can be directly extend...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/06
CPCH04B7/0413H04B7/0456H04B7/0626H04L1/00H04L1/06H04B7/0434H04B7/0478H04B7/0617H04B7/0639H04B7/0486H04B7/0634
Inventor 李辉高秋彬陈润华陈文洪塔玛拉卡·拉盖施
Owner DATANG MOBILE COMM EQUIP CO LTD