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Method, system and mobile terminal for transmitting channel information

A mobile terminal and transmission channel technology, applied in the direction of preventing/detecting errors through diversity reception, can solve problems such as inability to reflect, codebook size storage problem, codebook selection, etc., to reduce computational complexity and improve the effect of quantization accuracy

Inactive Publication Date: 2010-07-14
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] This method can theoretically improve the feedback performance very well, but since the size of the codeword increases exponentially with the codeword overhead, if N is large and M is large
There will be two serious defects: (1) codebook size storage problem (2) codebook selection problem
[0026] The disadvantage of this method is that there is an orthogonal relationship between the eigenvectors. In the codebook design of prior art 1, each column of the designed matrix codeword is orthogonal, while in prior art 2 , cannot reflect the relationship

Method used

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  • Method, system and mobile terminal for transmitting channel information
  • Method, system and mobile terminal for transmitting channel information
  • Method, system and mobile terminal for transmitting channel information

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0073] The UE can measure and estimate more accurate channel information according to the pilot frequency delivered by the base station.

[0074] The UE can first obtain the quantization of the N eigenvectors according to the obtained channel information.

[0075] Concretely, one can get from an R N Find the codewords that quantize these N feature vectors in the codebook of .

[0076] More specifically, the codebook can be the R of 4Tx or 8Tx in the LTE standard and the LTE-A standard N codebook.

[0077] If N is 1, UE starts from R 1 A codeword is selected from the codebook as the quantization of one of the feature vectors, and the feature vector may be, but not limited to, the feature vector corresponding to the largest feature value. Its quantization index is j. According to the same codebook stored at the transceiver end, the specific vector corresponding to j can be found, so as to find the quantization vector R of the eigenvector corresponding to the largest eigenva...

specific Embodiment 2

[0082] The UE can measure and estimate more accurate channel information according to the pilot frequency delivered by the base station.

[0083] The UE can first obtain the quantization of the N eigenvectors according to the obtained channel information.

[0084] Concretely, one can get from an R N Find the codewords that quantize these N feature vectors in the codebook of .

[0085] More specifically, the codebook can be the codebook of RankN of 4Tx or 8Tx in the LTE standard and the LTE-A standard

[0086] If N is 1, UE starts from R 1 The codebook selects a codeword as the quantization of one of the feature vectors, and the feature vector may be, but not limited to, the feature vector corresponding to the largest feature value. Its quantization index is j. According to the same codebook stored at the transceiver end, the specific vector corresponding to j can be found, so as to find the quantized vector corresponding to the eigenvector of the largest eigenvalue

[0...

specific Embodiment 3

[0091] The UE can measure and estimate more accurate channel information according to the pilot frequency delivered by the base station.

[0092] The UE can first obtain the quantization of the N eigenvectors according to the obtained channel information.

[0093] Specifically, codewords for quantizing the N feature vectors may be found from a Rank N codebook.

[0094] More specifically, the codebook can be the codebook of RankN of 4Tx or 8Tx in the LTE standard and the LTE-A standard

[0095] If N is 1, UE starts from R 1 The codebook selects a codeword as the quantization of one of the feature vectors, and the feature vector may be, but not limited to, the feature vector corresponding to the largest feature value. Its quantization index is j. According to the same codebook stored at the transceiver end, the specific vector corresponding to j can be found, so as to find the quantized vector corresponding to the eigenvector of the largest eigenvalue

[0096] If the UE ne...

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Abstract

The invention discloses a method, a system and a mobile terminal for transmitting channel information. The method comprises the following steps: determining the quantitative information PN of N number of channel eigenvectors by the mobile terminal, wherein N is an integer which is larger than 1; according to a codebook the sequence of which is 1, namely R1, and a function F (PN, R1), calculating to obtain a vector muster which is orthogonal with the quantitative information PN and corresponds to the codon of an R1 codebook; determining a vector and an index I which is in the R1 codebook and corresponds to the vector from the vector muster by the mobile terminal; transmitting the quantitative information PN and the index I to a base station; finding out the quantitative information of the (N+1)th eigenvector by the base station according to a vector RI1 which is in the R1 codebook and corresponds to the index I, the function F (PN, RI1) and the quantitative information PN; and obtaining a matrix muster according to a codebook RM the sequence of which is M and a function F (PN, RM). The invention can effectively reduce the complexity of codon selection and calculation, and improve the quantizing precision.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and system for transmitting channel information and a mobile terminal. Background technique [0002] In a wireless communication system, if both the transmitting end and the receiving end use multiple antennas, spatial multiplexing can be adopted to obtain a higher data transmission 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 to greatly improve the transmission performance. The simple implementation method is to directly use the channel feature vector information for precoding, which is mainly used in single-user multiple input multiple output (Multiple Input Multiple Output, referred to as MIMO) system, there are also some other bette...

Claims

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Application Information

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IPC IPC(8): H04L1/06
Inventor 陈艺戬徐俊张峻峰杨勋
Owner ZTE CORP
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