Method and device for sending feedback of channel state information
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A state information, feedback channel technology, applied in the field of communication network, can solve the problem of inapplicability
Active Publication Date: 2013-06-26
HUAWEI TECH CO LTD
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[0004] However, when using the existing technology to feed back channel state information, the DFT codeword of ULA only involves one dimension in the horizontal direction, and
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Embodiment 1
[0027] An embodiment of the present invention provides a method for feeding back channel state information, such as figure 1 As shown, the method includes:
[0028] Step 101: Determine the second group of orthogonal basis vectors and the group number of the second group of orthogonal basis vectors according to the predefined first group of basis vectors, each basis vector of the first group of basis vectors is horizontal, The Kronecker product of the basis vectors corresponding to at least two directions in the vertical direction and the polarization direction;
[0029] Step 102, according to the second orthogonal basis vector group, determine the third basis vector group corresponding to each data layer, in the third basis vector group corresponding to each data layer, there is at least one set of the third basis vector group The number of vectors is greater than 1;
[0030] Specifically, determine the basis vector quantity K(i) of the third basis vector group corresponding...
Embodiment 2
[0050] An embodiment of the present invention provides a method for feeding back channel state information, such as image 3 As shown, the method includes:
[0051] Step 301: Determine the second group of orthogonal basis vectors and the group number of the second group of orthogonal basis vectors according to the predefined first group of basis vectors, each basis vector of the first group of basis vectors is horizontal, The Kronecker product of the basis vectors corresponding to at least two directions in the vertical direction and the polarization direction;
[0052] The predefined set of first basis vectors is C 1 ={f 1 , f 2 ,..., f B}, where B is the total amount of beams, B=B a ×B p ×B e , B≥N T , N T is the number of antennas in the antenna array. The basis vectors of the first basis vector group are constructed by the Kronecker product from the azimuth component (azimuth), the polarization direction component (polar) and the vertical direction component (ele...
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Abstract
The invention discloses a method and a device for sending feedback of channel state information and relates to the technical field of communication networks. The method and the device for sending feedback of the channel state information can send feedback of the channel state information in a multi-dimensional antenna array on the basis of multi-layer data transmission of a generated codebook and reduce the amount of feedback bits. The technical scheme of the method and the device for sending feedback of the channel state information includes: determining a second orthogonal basis vector set and the set number of the second orthogonal basis vector set according to a predefined first basis vector set, determining a third orthogonal basis vector set corresponding to every data layer according to the second orthogonal basis vector set, respectively calculating second level code words for every data layer, and sending the set number of the second orthogonal basis vector set, the third orthogonal basis vector set corresponding to every data layer and the second level code words corresponding to every data layer to a base station, so that the multi-layer code words can be combined by the base station. The method and the device for sending feedback of the channel state information can be used for sending feedback of the channel state information.
Description
technical field [0001] The invention relates to the technical field of communication networks, in particular to a method and device for feeding back channel state information. Background technique [0002] MIMO (Multiple Input Multiple Output) technology is one of the most important technologies to improve the spectral efficiency of wireless systems. In MIMO systems, usually the transmitting end can only obtain better transmission results when the channel is known. In FDD (Frequency Division Duplexing , frequency division duplex) system, the channel state information is usually fed back from the receiving end to the transmitting end, therefore, which method to use to feed back the channel state information is a hot spot in standard design. [0003] When feeding back channel state information in the prior art, the channel eigenvector is first quantized by weighted combination of multiple DFT (Discrete Fourier Transform, discrete Fourier transform) codebooks, and then the firs...
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