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Feedback method and terminal of pre-correction information

An information feedback and pre-correction technology, applied in the field of communication, can solve the problems of difficult to eliminate inter-layer interference, inability to solve inter-layer interference, uncontrollable inter-layer interference in local precoding, and achieve better effect and eliminate inter-layer interference. Effect

Inactive Publication Date: 2017-11-28
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar to this, but the problem in the existing technology is: if only one phase information is added at each layer, such as multiplying the pre-correction matrix at a sending node Although there is a certain in-phase combination gain, it is difficult to eliminate inter-layer interference when the Local Precoding method is combined. The reason can be further as follows: image 3 As shown in the figure, Rank2 is taken as an example in the figure. When there are multiple layers, just adjusting the phase cannot solve the problem of interlayer interference.
[0020] For the problem of uncontrollable inter-layer interference of local precoding in related technologies, no effective solution has been proposed yet

Method used

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  • Feedback method and terminal of pre-correction information
  • Feedback method and terminal of pre-correction information
  • Feedback method and terminal of pre-correction information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In this embodiment, taking two coordinating nodes as an example, it is assumed that the type of pre-correction processing at the base station is expressed as:

[0059] Here, x is the transmitted data, and it is a 2-dimensional column vector during 2-layer data transmission. D is the 2×2 pre-correction matrix that needs to be multiplied when the second node sends. W1 and W2 are the pre-coding matrices used by the two nodes to match the channel when sending. The first node does not have a pre-processing matrix, so it is directly multiplied by W1 , and then pass the signal through the channel to the receiving end. For the second node, after the preprocessing matrix is ​​multiplied by its precoding matrix W2, and then through the channel

[0060] The terminal is based on the maximum signal power criterion, as shown in the following formula: Select the appropriate W1 and W2 from the Local Precoding codebook, and select the most suitable D matrix from the correction ...

Embodiment 2

[0064] In this embodiment, taking two coordinating nodes as an example, it is assumed that the model of the base station and the correction process is expressed as:

[0065] Here, x is the transmitted data, and it is a 2-dimensional column vector during 2-layer data transmission. D1 is the 2×2 pre-correction matrix that needs to be multiplied when the first node sends, D2 is the 2×2 AND correction matrix that needs to be multiplied when the second node sends, W1 and W2 are used to match the channel when two nodes send The precoding matrix of , the first node is multiplied by W1 after the preprocessing matrix, and then passes the signal through the channel to the receiving end. For the second node, after the preprocessing matrix is ​​multiplied by its precoding matrix W2, and then through the channel

[0066] According to the maximum signal power criterion, the terminal selects the appropriate W1 and W2 from the Local Precoding codebook, and selects the most suitable D1 ...

Embodiment 3

[0071] In this embodiment, the correction codebook is 1 bit, which can be one of the following:

[0072]

[0073] Wherein, in this embodiment, the flow of the pre-correction process is the same as that of the previous embodiment, and the only difference is that the codebook is different, so no detailed description is given here.

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Abstract

Provided are a method and terminal for feeding back pre-correction information. The method includes: a terminal selecting a code word from a predefined codebook; and the terminal taking the index of the code word as pre-correction information to be fed back to the base station side. In the present invention, the terminal feeds back pre-correction information to the base station side, which enables better in-phase combination effects of various layers in the local pre-coding, thereby achieving the effect of cancelling out inter-layer interference.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method for feeding back pre-correction information and a terminal. Background technique [0002] With the introduction of LTE-A requirements, people pay more and more attention to the average spectral efficiency of nodes and the spectral efficiency of node edges. In comparison, the spectral efficiency of node edges has attracted the most attention. This is mainly because the upper and lower levels of the LTE-A system Lines are based on Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM), or a frequency division system that uses a certain deformation of OFDM as the basic multiple access multiplexing method, which is different from the traditional Code Division Multiple Access (Code Division Multiple Access) , CDMA) is different from the wireless communication system in which the basic multiple access multiplexing method is used. The LTE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/0417H04B7/0456
CPCH04B7/0639H04L25/03343
Inventor 陈艺戬郝鹏孙云锋郑勇
Owner ZTE CORP