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Channel information feedback method and device

A channel state information and feedback module technology, applied in the field of communication, can solve the problems of transmitting channel state information, no codebook quantization, and low system robustness, and achieve the effect of improving robustness

Inactive Publication Date: 2013-01-02
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, for the above-mentioned planar antenna array, there is no codebook quantization scheme proposed in the related art, so the channel state information cannot be transmitted by effectively quantizing the channel coefficients, which leads to the problem of relatively low system robustness

Method used

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Experimental program
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Effect test

Embodiment approach

[0040] Mode 1: Perform Kronecker product of the first codebook and the first and second codebooks or perform Kronecker product of the second codebook and the first codebook to obtain the third codebook; quantize the channel state information Afterwards, the index corresponding to the third codebook is fed back.

[0041]Manner 2: Feedback the first index corresponding to the first codebook after quantization of the channel state information and the second index corresponding to the second codebook after quantization are respectively fed back.

[0042] It should be noted that the first method needs to feed back the index of one codebook, and the process is relatively simple. The second method is to feed back the indexes of two codebooks. During implementation, the first codebook can be defaulted and only the second codebook can be fed back. It is also possible to feed back the first codebook for the first time and feed back the second codebook for the second time. This implement...

Embodiment 1

[0061] This embodiment provides a codebook construction method and a feedback method, thereby improving the capacity and efficiency of a communication system configured with a planar antenna array. In this embodiment, it is assumed that the system equipment has N t transmit antennas, and can be decomposed into N t =N x ×N y , where N x and N y are natural numbers, the terminal has N r a receiving antenna.

[0062] In this embodiment, two schemes are used to construct the codebook:

[0063] Option One:

[0064] The steps included in this scenario are as follows:

[0065] Step S702: Define a codebook or a set of codewords in advance in the terminal and system equipment of the communication system, where the codebook consists of the first codebook C 1 and the second codebook C 2 constitute.

[0066] Specifically, the first codebook C 1 Contains K 1 N x ×r(1≤r≤N x ) complex matrix, and each column of the matrix is ​​orthogonal to each other;

[0067] where C 2 Con...

Embodiment 2

[0080] In this embodiment, it is assumed that the base station side of the system equipment is configured with 12 antennas, which are divided into two groups (such as Figure 7 shown), each group has 6 antennas, so there are N x =6,N y =2, the structure of the codebook is described with the case of r=2.

[0081] First construct a A 6×2 codeword (matrix) set C 1 , where each matrix k=0,...K 1 -1 all satisfy the property that the two columns are mutually orthogonal. and then construct a A set C of codewords (column vectors) 2 , where each column vector l=0,...K 2 -1 can be represented as:

[0082] l=0,,...K 2 -1

[0083] Then the final codeword set C is constructed as:

[0084]

[0085] where C i Indicates the i-th codeword in the set C. Indicates to take the largest integer less than or equal to the input parameter, means i divided by K 1 the remainder of represents the Kronecker product, e.g., but can be written as:

[0086]

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Abstract

The invention discloses a channel state information feedback method and a device. The method includes that a first codebook is generated by using the number of antennas in each row of a planar antenna array, a second codebook is generated by the number of columns of the planar antenna array, and channel state information is back fed by using the first codebook and the second codebook. By means of the channel information feedback method and the device, the system robustness is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a channel information feedback method and device. Background technique [0002] With the development of wireless communication technology, the application of array antennas is becoming more and more extensive, in which linear array antennas ( figure 1 and figure 2 ), so that the use of beamforming technology to increase the coverage area of ​​the cell and improve the spectral efficiency has already had considerable applications. This technology mainly uses the electromagnetic wave propagation with strong directionality between the terminal and the system equipment. At the sending end Perform preprocessing to form beams pointing in the direction of the terminal to achieve coherent superposition of signals, thereby increasing the received power. However, this traditional beamforming technology mainly considers the beamforming technology in the horizontal direction, that is, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
CPCH04B7/0482H04L43/065H04L25/0391H04B7/0626H04B7/0456H04B7/06
Inventor 朱登魁鲁照华
Owner ZTE CORP
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