Feedback method and device of downlink channel information based on multicode book

A technology for channel information feedback and channel information, applied in the field of technical channel information feedback and precoding, can solve the problem that the effective inheritance of the 4-antenna codebook cannot be reflected.

Inactive Publication Date: 2010-09-08
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] The advantage of the first solution is that it can effectively improve the accuracy of codewords reflecting downlink channel information by using existing adaptive and differential technologies, but it cannot reflect the effective inheritance of the existing 4-antenna codebook of Rel.8
The advantage of the second scheme is that it can effectively inherit the 4-antenna codebook of Rel. Accurate downlink channel information

Method used

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  • Feedback method and device of downlink channel information based on multicode book
  • Feedback method and device of downlink channel information based on multicode book
  • Feedback method and device of downlink channel information based on multicode book

Examples

Experimental program
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Embodiment 1

[0062] figure 1 It is a flow chart of Embodiment 1 of the multi-codebook-based downlink channel information feedback method of the present invention, as shown in figure 1 As shown, this example multi-codebook-based downlink channel information feedback method includes the following steps:

[0063] Step 101: Configure 4 sets of codebooks CB on UE and base station at the same time 1 、CB 2 、CB 3 and CB 4 . Among them, CB 1 is the 4-antenna codebook of LTE Rel.8, that is, CB 1 It is a codebook fully compatible with the 4-antenna technology in the existing LTE system. CB 2 is an extended codebook, which is used to extend the 4-antenna codewords to 8-antenna codewords. CB 3 and CB 4 is an optimized codebook, which is used to represent the eigenvector of the downlink channel correlation matrix R, and can restore the corresponding R, and R can be used to adaptively improve the accuracy of the selected 4-antenna basic codewords to represent downlink channel information. abo...

Embodiment 2

[0075] figure 2 It is a flow chart of Embodiment 2 of the multi-codebook-based downlink channel information feedback method of the present invention, as shown in figure 2 As shown, this example multi-codebook-based downlink channel information feedback method includes the following steps:

[0076] Step 201: Configure 3 sets of codebooks CB on UE and base station at the same time 1 、CB 2 、CB 3 . Among them, CB 1 is the 4-antenna codebook of LTERel.8, that is, CB 1 It is a codebook fully compatible with the 4-antenna technology in the existing LTE system. CB 2 is an extended codebook, which is used to extend the 4-antenna codewords to 8-antenna codewords. CB 3 It is a differential codebook, and its function is to improve the accuracy of the selected 4-antenna basic codewords to represent the downlink channel information by making up for the deviation between the downlink channel information represented by the basic codebook and the real downlink channel information. ...

Embodiment 3

[0085] image 3 It is a flow chart of Embodiment 3 of the multi-codebook-based downlink channel information feedback method of the present invention, as shown in image 3 As shown, this example multi-codebook-based downlink channel information feedback method includes the following steps:

[0086] Step 301: Configure 3 sets of codebooks CB on UE and base station at the same time 1 、CB 2 、CB 3 . Among them, CB 1 is the 4-antenna codebook of LTERel.8, that is, CB 1 It is a codebook fully compatible with the 4-antenna technology in the existing LTE system. CB 2 is an extended codebook, which is used to extend the 4-antenna codewords to 8-antenna codewords. CB 3 It is a two-level codebook, and its function is to improve the accuracy of the selected 4-antenna basic codewords to represent the downlink channel information by making up for the deviation between the downlink channel information represented by the basic codebook and the real downlink channel information. above...

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Abstract

The invention discloses a feedback method of downlink channel information based on a multi-codebook, wherein a four-antenna basic codebook, an extended codebook and at least an optimized codebook capable of improving the accuracy degree for a code to reflect the downlink channel information are arranged. In the method, UE (User Equipment) selects corresponding code words from the four-antenna codebook which is a basic codebook, the extended codebook and the optimized codebook according to current downlink channel information and feeds back the serial numbers of the selected code words in the codebook per se to a base station; and the base station searches for corresponding code words from the more than two code work serial numbers sent by the UE and works out corresponding code words according to the code words, wherein the code words represent the current downlink channel information. The invention simultaneously discloses a device for realizing the method. The invention can ensure that the base station acquires the downlink channel information with high precision at low cost, thereby effectively optimizing the transmission quality of downlink signals and improving the transmission efficiency of the downlink channel.

Description

technical field [0001] The present invention relates to technical channel information feedback and precoding technology, in particular to a downlink channel information feedback method and device based on multiple codebooks. Background technique [0002] In wireless communication, if both the transmitting end and the receiving end use multiple antennas, spatial multiplexing can be used to obtain a higher rate. Compared with the general spatial multiplexing method, an enhanced technology is that the receiving end feeds back the channel information to the sending end, and the sending end uses some transmit precoding techniques according to the obtained channel information, which can greatly improve the transmission performance. The simple use method is to directly use the channel feature vector information for precoding, which is mainly used in single-user multiple input multiple output (MIMO, Multiple Input Multiple Output), and there are other better but more complicated met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 杨勋陈艺戬徐俊李儒岳
Owner ZTE CORP
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