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Feedback and determination methods and devices for channel state information

A technology of channel state information and channel information, applied in the field of communication, can solve problems such as inability to guarantee inter-layer orthogonality, inability to provide multi-panel antenna correlation feedback, etc.

Active Publication Date: 2018-07-17
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Embodiments of the present invention provide a method and device for feedbacking and determining channel state information, so as to at least solve problems in the related art that the antenna correlation of multiple panels cannot be well fed back, and that multi-layer linear combination codebooks cannot The problem of guaranteeing orthogonality between layers

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  • Feedback and determination methods and devices for channel state information
  • Feedback and determination methods and devices for channel state information

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specific Embodiment 1

[0177] This specific embodiment provides a specific implementation manner of channel information quantization feedback under multiple panels. In 5G technology, Figure 4 is a schematic diagram of the multi-panel large-scale antenna array in this specific embodiment, as Figure 4 As shown, the way to configure a multi-panel large-scale antenna array at the base station has been extensively studied. exist Figure 4 , the entire planar antenna array contains M g N g panels, and each panel contains MN ports. In each panel, the antenna port spacing is uniformly distributed, and the distance between adjacent antenna panels is also uniformly distributed, while the distance between adjacent ports of adjacent antenna panels is not necessarily equal to the antenna spacing in the panel. Therefore, the correlation of antennas between panels is not necessarily equivalent to the correlation of antennas within a panel. Traditionally, one-dimensional or two-dimensional discrete Fourier T...

specific Embodiment 2

[0188] This specific embodiment provides a way of quantizing channel state information under multiple panels. In the specific embodiment 1, the beams of different panels are obtained by angularly rotating the beams. In addition to the angular rotation, the beams can also be changed by phase transformation and amplitude expansion. For example, the precoding of the kth panel in polarization direction i can be expressed as:

[0189]

[0190] Among them, the matrix P k,i is a diagonal matrix, which means to perform phase transformation and amplitude expansion on the beam on panel k, and its form is as follows:

[0191]

[0192] Indicates the amplitude expansion of the beam, Indicates the phase transformation of the beam. In this way, the final precoding satisfies the following structure:

[0193]

[0194] Using the above precoding matrix, the spatial correlation in CSI reported by different panels can also be optimized. On the other hand, through W 1 , W 2 and W...

specific Embodiment 3

[0195] This specific embodiment provides a specific implementation manner of channel information quantization under multiple panels. In LTE Rel-13, two feedback methods are introduced, Class A feedback based on NP CSI-RS and Class B feedback based on BF CSI-RS. Class A uses port-combining precoding, while Class B uses port-selective precoding. Embodiment 1 and Embodiment 2 can be regarded as using Class A feedback to obtain precoding information. This embodiment provides a method for obtaining CSI using Class B port selection precoding under multiple panels. For each panel, the base station converts the antenna port into B virtualized CSI-RS ports through BFCSI-RS, and each port corresponds to a beam. When the terminal feeds back, the beam selection information in the panel and the inter-panel correlation information are fed back. Feedback to CSI. For LTE, the new Class B codebook of Rel-13 can realize this function to a certain extent. However, the port group division of t...

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Abstract

The invention provides feedback and determination methods and devices for channel state information. The feedback method comprises a step of feeding back the channel state information according to thedetermined structure of the channel state information, wherein the structure of the channel state information comprises M channel state information subsets; the mth channel state information subset of the M channel state information subsets comprises km channel information components; the M channel state information subsets comprise N channel state information subsets, wherein the nth channel state information subset of the N channel state information subsets comprises Ln channel information components, and the Ln channel information components are determined by transforming a group of basisvectors. According to the methods and the devices, an inter-layer orthogonal effect of multi-layer linear combination codebooks can be guaranteed.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method and device for feedback and determination of channel state information. Background technique [0002] In a wireless communication system, the transmitting end and the receiving end generally use multiple antennas to transmit and receive to obtain a higher transmission rate. One principle of multiple-input-multiple-output (MIMO) technology is to use some characteristics of the channel to form multi-layer transmission that matches the characteristics of the channel, so as to effectively improve system performance without increasing bandwidth and It is a very promising technology to obtain significant performance improvement on the basis of power, which is widely used in current systems. For example, in the Long Term Evolution (referred to as LTE) and its enhanced version (Long Term Evolution-Advanced, referred to as LTE-A) systems, there are multiple modes of multi-a...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/06H04L1/00
CPCH04B7/0456H04B7/0626H04L1/0027H04B7/0469H04B7/0478H04B7/0479H04B7/0417H04W24/10H04W72/046H04W80/08
Inventor 吴昊李儒岳陈艺戬鲁照华张楠
Owner ZTE CORP
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