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Method and system for acquiring channel information

A technology of channel information and acquisition method, which is applied in the field of channel information acquisition method and system, can solve problems such as ununiform C1 design, not satisfying 8-bit phase-shift keying, not suitable for dual-polarized antenna configuration, etc., and achieve the goal of improving system performance Effect

Active Publication Date: 2015-08-12
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] The disadvantage of this technique is that the 16 DFT codewords are based on the relevant channel conditions of the single-polarized antenna (such as figure 1 As shown), there is always a phase difference between adjacent antennas to establish a model design. Although it is very suitable for single-polarized channels, it is not suitable for dual-polarized antenna configurations.
The elements in the other 16 DFT code words do not satisfy the 8-bit phase shift keying (Phase Shift Keying, referred to as PSK) characteristics
[0025] In addition, the C1 design is not uniform enough. For C2, the enhanced codebook can only be designed for single-polarized antennas, which brings great limitations to practical applications.

Method used

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  • Method and system for acquiring channel information

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Embodiment 1

[0077] For S subbands, the UE feeds back one PMI1 for S subbands, and at least one PMI2 for a certain subband, and may be S PMI2 for S subbands at most. Taking feeding back one PMI2 as an example, the UE determines that the index indicated by the PMI1 to be fed back is 3 according to the first codebook shown in Table 3, and feeds back one PMI2 according to the second codebook. The second codebook is a combined codebook of a 3-bit single-polarization DFT enhanced codebook and dual-polarization phase rotation enhanced codebook, which contains 8 codewords:

[0078] table 5

[0079]

[0080]

[0081] The base station finds the corresponding codeword W1 from the first codebook according to the received PMI1 as [1 -j -1 j 1 -j -1 j] T , find the corresponding codeword W2 from the second codebook according to the received PMI2 as:

[0082] 1 ...

Embodiment 2

[0088] For S subbands, UE1 feeds back one PMI1 for S subbands, and at least one PMI2 for a certain subband, and may be S PMI2 for S subbands at most. Taking the feedback of S PMI2 as an example, the UE determines that the index indicated by PMI1 to be fed back is 4 according to the first codebook shown in Table 4, and feeds back S PMI2s according to the second codebook shown in Table 5, that is, PMI2-1, PMI2 -2...PMI2-S. The base station finds the corresponding codeword W1 from the first codebook according to the received PMI1 as Find the corresponding codeword W2-1, W2-2...W2-S from the second codebook according to the received S PMI2, according to F(W1, W2-i)=W1×W2-I , i=1, 2...S, to obtain channel information of S subbands.

Embodiment 3

[0090] For S subbands, UE feeds back 1 PMI1 for S subbands and 1 PMI2 for S subbands. PMI1 corresponds to codeword W1 in the first code, and PMI2 corresponds to codeword W2 in the second code. The base station according to F (W1, W2)=W1×W2, to obtain channel information of S subbands.

[0091] In addition to the setting of the second codebook shown in Table 5 above, other codebook setting forms suitable for both dual-polarization channels and single-polarization channels may also be used.

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Abstract

A method, system and base station for obtaining channel information is provided in the present invention, wherein, the method includes: a terminal transmits a first Precoding Matrix Indicator (PMI) and a second PMI to a base station; said first PMI is a PMI1 corresponding to the whole S subbands in the total bandwidth and corresponds to the codeword W1 in the first codebook; the second PMI is a PMI2 corresponding to the whole S subbands in the total bandwidth and corresponds to the codeword W2 in the second codebook, or the second PMI are X PMI2is respectively corresponding to a single subband and respectively correspond to the codewords W2is in the second codebook; and the base station obtains the codeword W1 and the codeword W2 or W2i and figures out the channel information of the whole S subbands in the total bandwidth or the channel information of each relevant subband among the S subbands.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and system for acquiring channel information. Background technique [0002] In a wireless communication system, the sending end and the receiving end use multiple antennas to obtain a higher rate by means of spatial multiplexing. 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 the transmit precoding technology according to the obtained channel information, which can greatly improve the transmission performance. In the Single User Multi-input Multi-output (SU-MIMO) technology, the channel feature vector information is directly used for precoding; in the Multi User Multi-input Multi-output (Multi User Multi-input Multi-output , referred to as MU-MIMO), more accurate channel information is required. [0003] In the 3rd Genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/16
CPCH04B7/0658H04B7/0639
Inventor 李儒岳陈艺戬徐俊闫文俊徐前子
Owner ZTE CORP