Channel information quantized feedback method and device and data precoding method and device

A channel information and precoding technology, applied in the field of communication, can solve the problem of lack of consideration of polarization leakage in the feedback model

Active Publication Date: 2014-12-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] The present invention provides a method and device for quantitative feedback of channel information and data precoding to at least solve the problem that the feedback model designed in the related art lacks consideration of polarization leakage

Method used

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  • Channel information quantized feedback method and device and data precoding method and device
  • Channel information quantized feedback method and device and data precoding method and device
  • Channel information quantized feedback method and device and data precoding method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] The base station transmits the channel measurement pilot. Taking Nt transmitting antennas as an example, there are Nt / 2 antennas respectively in two mutually perpendicular polarization directions. The base station sends a set of CSI-RS pilots with a total of Nt ports. The terminal receives the pilot configuration information sent by the base station, and detects at the corresponding resource position, so as to obtain the information of the channel matrix H of dimension Nr×Nt. Here, Nr is the number of receiving antennas.

[0155] The terminal and the base station may agree in advance to use the following function to represent the eigenvector information or precoding information of the channel matrix.

[0156] Feature vector or optimal precoding W = F(CMatrix1, CMatrix2, θ, κ);

[0157] The expression of this function is as follows:

[0158] F(CMatrix1, CMatrix2, θ, κ) = CMatrix1+e jθ *f(κ)*CMatrix2, where f(κ) is a function whose independent variable is κ.

[0159]...

Embodiment 2

[0187] The base station transmits the channel measurement pilot. Taking Nt transmitting antennas as an example, there are Nt / 2 antennas respectively in two mutually perpendicular polarization directions. The base station sends a set of CSI-RS pilots with a total of Nt ports. The terminal obtains the pilot configuration information sent by the base station, and performs detection on the corresponding resource position to obtain the information of the Nr×Nt-dimensional channel matrix H. Here, Nr is the number of receiving antennas.

[0188] The terminal and the base station agree in advance to use the following functions to represent the eigenvector information or precoding information of the channel matrix.

[0189] Feature vector / best precoding W=F(CMatrix1,CMatrix2,θ,κ);

[0190] The expression of this function is as follows:

[0191] F(CMatrix1, CMatrix2, θ, κ) = CMatrix1+e jθ *f(κ)*CMatrix2, where f(κ) is a function whose independent variable is κ.

[0192] In a prefer...

Embodiment 3

[0219] For the above preferred embodiment 1 and preferred embodiment 2, the phase θ can be a preset fixed value, for example: θ can take a value of 0, then e jθ =1; or, the phase θ may be a value pre-configured by the base station to the terminal.

[0220] The function F(CMatrix1,CMatrix2,θ,κ) is actually simplified to F(CMatrix1,CMatrix2,κ);

[0221] For the above-mentioned preferred embodiment 1 and preferred embodiment 2, the ratio κ may be a value pre-configured by a base station to a terminal. The function F(CMatrix1,CMatrix2,θ,κ) actually reduces to F(CMatrix1,CMatrix2,θ).

[0222] For the above situation, the terminal may consider the phase θ and / or the ratio κ as a known variable when selecting other optimal parameters, without calculation and feedback.

[0223] The function F(CMatrix1, CMatrix2, θ, κ) can actually be simplified to:

[0224] F(CMatrix1, CMatrix2, κ), F(CMatrix1, CMatrix2, θ), or F(CMatrix1, CMatrix2).

[0225] When the base station calculates and o...

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Abstract

The invention discloses a channel information quantized feedback method and device and a data precoding method and device. The channel information quantized feedback method comprises the following steps: receiving a channel measuring pilot signal from a base station; performing channel measurement according to the channel measuring pilot signal to obtain channel information; calculating CMatrix1 and CMatrix2 by adopting the channel information, wherein the CMatrix1 and the CMatrix2 are used for quantifying the channel information or instructing a base station to perform precoding; and feeding back first indicating information of the CMatrix1 and / or second indicating information of the CMatrix2 to the base station. According to a technical scheme provided by the invention, the influence of polarization leakage is considered in feedback design, so that a remarkable performance gain exists under the practical situation of polarization leakage.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a method and device for quantization feedback of channel information and data precoding. Background technique [0002] In a wireless communication system, a spatial multiplexing method is usually adopted between the sending end and the receiving end, and multiple antennas are used to obtain a higher transmission rate. Compared with the general spatial multiplexing method, an enhanced technical solution is mentioned in the related art. In this scheme, the receiving end feeds back channel information to the sending end, and the sending end uses some transmit precoding techniques according to the obtained channel information to greatly improve the transmission performance. For single-user MIMO (Multi-input Multi-output, MIMO for short), channel feature vector information is directly used for precoding; for multi-user MIMO (MU-MIMO), more accurate channel information is required. ...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/02H04B7/04
CPCH04B7/0469H04B7/0478H04L25/03343H04B7/04H04L25/03H04B7/0421H04B7/0452H04B7/0456H04B7/0634
Inventor 陈艺戬鲁照华郁光辉赵晶肖华华
Owner ZTE CORP
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