Method and device for feeding back channel quantitative information

A channel quantization and channel correlation technology, applied in the field of channel quantization information feedback method and device, can solve the problems of low quantization efficiency and waste

Active Publication Date: 2010-09-08
江苏慧煦电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, unnecessary waste of some codewords in the codebook is caused, resulting in low quantization efficiency

Method used

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  • Method and device for feeding back channel quantitative information
  • Method and device for feeding back channel quantitative information
  • Method and device for feeding back channel quantitative information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] In order to make the codebook C b It can also quantize the channel well when there is no channel correlation matrix R rotation, ensuring better mode compatibility, and when there is a channel correlation matrix R to the codebook C b The rotated codeword can still ensure a good structure for dual-polarization channels during rotation, and the codebook C b Part or all of the codewords in can have the following structure: (when Rank1), where u 1 is a 4-dimensional vector, a and b are constants. Preferably, u 1 The elements in are elements in the 16PSK alphabet set or 0, a, b are elements in the 16PSK alphabet set or 0. Preferably, u 1 is any column vector in the codeword matrix in the Rank4 codebook in the LTE system. Preferably, u 1 is a codeword in the Rank1 codebook in the LTE system. The codebook C that meets the requirements of this preferred embodiment can be constructed by using the codewords in the existing codebook b .

[0060] Preferably, the above cod...

Embodiment 2

[0073] The UE obtains the current channel matrix H and the long-term statistical channel correlation matrix R according to the pilot.

[0074] The UE side and the base station side define a same codebook C b . The codebook C b Can be:

[0075] A codebook consisting of 16 vectors.

[0076] Can also be:

[0077] composed of a codebook.

[0078] Can also be:

[0079] composed of a codebook.

[0080] The UE feeds back the R information in a long period, so that both the transmitting and receiving ends know the R information together, or the base station obtains the long-term statistical R information according to the reciprocity of the uplink and downlink channels.

[0081] The UE and the base station agree to use the adaptive codebook technology and the channel correlation matrix R for the codebook C b Do the processing to get the adaptive codebook C B .

[0082] For the current channel matr...

Embodiment 3

[0084]The UE obtains the current channel matrix H and the long-term statistical channel correlation matrix R according to the pilot.

[0085] UE and base station define the same codebook C b . The codebook C b Can be:

[0086] A codebook composed of 16 vectors;

[0087] Can also be:

[0088] A codebook composed of;

[0089] Can also be:

[0090] A codebook composed of;

[0091] Can also be:

[0092] composed of a codebook.

[0093] The UE feeds back the R information in a long period, so that the transmitting and receiving ends jointly guide the R information, or the base station obtains the long-term statistical R information according to the reciprocity of the uplink and downlink channels.

[0094] The UE and the base station agree to use the existing adaptive codebook technology to use the channel correlation matrix to pair the codebook C b Do the processing to get the adaptive...

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Abstract

The invention discloses a method and a device for feeding back channel quantitative information. The method comprises the following steps that: a receiving end processes a first codebook by using channel-related information to obtain a second codebook and transmits the indication information corresponding to a code word in the second codebook to a transmitting end, wherein the vectors consisting of the former X elements of each code word in the first codebook are different from one another; the element in the code word meets the characteristic of 8PSK or 16PSK; and Nt is the number of transmitting antennas at the transmitting end and an operator which is rounded up. The method and the device reduce the level of similarity of the code word in the codebook (CB), increase the distance between every two code words and improve the quantization efficiency.

Description

technical field [0001] The present invention relates to the communication field, in particular to a feedback method and device for channel quantization information. Background technique [0002] In a wireless communication system, 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 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 transmission performance. The simple way to use it is to directly use the channel feature vector information for precoding, which is mainly used in single-user MIMO (multiple-input multiple-output), and there are other better but more complicated methods, which are mainly used in multi-user MIMO. However, these methods all require more...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04B7/04
Inventor 陈艺戬李儒岳徐俊李书鹏张峻峰
Owner 江苏慧煦电子科技有限公司
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