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Channel state information transmission method, user equipment and base station in MIMO system

A technology of channel state information and transmission method, which is applied in the field of user equipment (User Equipment), can solve the problems of not being able to describe the long-term statistical characteristics of the channel well, the impact of system precoding performance, and inapplicability, so as to improve the precoding performance and effectively Effect of CSI feedback and precoding manipulation

Inactive Publication Date: 2014-11-12
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a channel state information transmission method, user equipment and base station in a MIMO system to solve the problem that most of the dual codebooks in the prior art are not suitable for the planar antenna array layout and cannot well describe the planar antenna array layout. The long-term statistical characteristics of the channel of the antenna array layout, which has a greater impact on the system precoding performance

Method used

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  • Channel state information transmission method, user equipment and base station in MIMO system
  • Channel state information transmission method, user equipment and base station in MIMO system
  • Channel state information transmission method, user equipment and base station in MIMO system

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The CSI transmission method in the MIMO system of Embodiment 1 may be performed by any UE. Such as figure 1 As shown, the method includes the following steps:

[0039] Step S102, according to the obtained CSI of the channel, find the corresponding first precoding matrix and first PMI in the first layer codebook of the planar antenna array, wherein the first PMI is the PMI of the first precoding matrix ;

[0040] In actual implementation, the UE can perform channel estimation according to the received pilot sequence to obtain CSI.

[0041] Since each precoding matrix in the codebook corresponds to a PMI (Precoding Matrix Indicator, precoding matrix indication), the corresponding precoding matrix can be found in the first layer codebook of the planar antenna array according to the obtained CSI. A coding matrix (called a first precoding matrix) and a PMI corresponding to the first precoding matrix (called a first PMI). The first-level codebook of the planar antenna arr...

Embodiment 2

[0065] The CSI transmission method in the MIMO system of Embodiment 2 may be performed by any base station. Such as figure 2 As shown, the method includes the following steps:

[0066] Step S302, receiving the first PMI and the second PMI reported by the UE;

[0067] In actual implementation, the base station acquires the first PMI and the second PMI from the uplink channel.

[0068] Step S304, according to the received first PMI, find the corresponding first precoding matrix in the first layer codebook of the planar antenna array, and according to the received second PMI, find the corresponding first precoding matrix in the second layer of the planar antenna array Finding the corresponding second precoding matrix in the codebook;

[0069] Among them, the first-level codebook of the planar antenna array is obtained by direct product operation on the first-level codebook of the linear array of the planar antenna array in the x-axis direction and the y-axis direction, and th...

Embodiment 3

[0074] The third embodiment is based on the codebook design idea of ​​discrete Fourier (DFT), as image 3 The URA 4×4 layout of 32 dual-polarized antenna elements shown is taken as an example to describe the methods in the first and second embodiments above in detail. exist image 3 In , each line segment represents one antenna element, and the line segments with the same direction indicate that the polarization directions of the corresponding antenna elements are the same.

[0075] The specific construction method of the first-layer codebook and the second-layer codebook for URA includes the following steps:

[0076] Step S401, will be as image 3 The straight lines where the two mutually perpendicular sides of the shown URA are located are taken as the x-axis direction and the y-axis direction;

[0077] Step S402, for the linear array corresponding to the URA in the x-axis direction, construct its first-layer codebook based on the rotation DFT matrix, which is recorded as...

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Abstract

The invention discloses a channel state information transmission method, user equipment and a base station in an MIMO system. The method comprises the steps that according to obtained CSI of a channel, a first precoding matrix and a first PMI which correspond to each other are found in a first codebook layer of a planar antenna array, wherein the first PMI is the PMI of the first precoding matrix; according to the CSI and the first PMI, a second precoding matrix and a second PMI which correspond to each other are found in a second codebook layer of the planar antenna array, wherein the second PMI is the PMI of the second precoding matrix; the first PMI and the second PMI are reported to the base station. The first codebook layer of the planar antenna array is obtained by conducting direct product operation on first codebook layers of linear arrays in the x-axis direction and the y-axis direction of the planar antenna array, and the x-axis and the y-axis are straight lines where two perpendicular sides of the planar antenna array are located. According to the channel state information transmission method, the user equipment and the base station in the MIMO system, the precoding performance of the system is improved, and effective CSI feedback and precoding operation are provided for a large-scale antenna system.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a method for transmitting channel state information in a MIMO system, a user equipment (User Equipment, UE) and a base station. Background technique [0002] In a Multiple-Input Multiple-Output (MIMO) system, in order to improve system transmission performance by precoding at the sender, the sender needs to know Channel State Information (CSI), and CSI is usually It is obtained by the receiving end using the reference sequence to perform channel estimation, which requires the receiving end to feed back CSI to the sending end. However, the limitation of the CSI feedback channel determines that the design of the precoding codebook is necessary. [0003] At present, many precoding codebooks have been proposed, for example, a dual codebook based on discrete Fourier transform (Discrete Fourier Transform, DFT) applied to LTE (Long Term Evolution, long term...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04L1/00H04B7/06
Inventor 粟欣曾捷黎靖宇容丽萍孙程君李迎阳
Owner BEIJING SAMSUNG TELECOM R&D CENT
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