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A channel rank reduction method and device for a large-scale antenna system

A large-scale antenna and channel technology, applied in the field of communication, can solve the problems of affecting the performance of downlink beamforming, the deterioration of downlink space separation performance, and the destruction of downlink spatial channel matrix, etc.

Active Publication Date: 2020-05-29
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If some antennas are faulty or damaged in the Massive MIMO antenna system, the spatial matrix of multiple antennas will be destroyed, the channel matrix between multiple users may no longer be orthogonal, and the mutual interference between multiple users will become particularly Prominent, system performance deteriorates
This is mainly manifested in that for ordinary users, that is, users who do not perform beamforming, their uplink and downlink channels are independent, and if there is channel damage, it may increase interference to the uplink and downlink channels; for space division users, that is, beamforming For shaped users, the damage of the radio frequency channel will not only affect the performance of the downlink beamforming, but also destroy the matrix of the downlink spatial channel. Multiple users are no longer orthogonal, and may even interfere with each other, and the downlink space division performance will deteriorate

Method used

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  • A channel rank reduction method and device for a large-scale antenna system
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  • A channel rank reduction method and device for a large-scale antenna system

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Embodiment 1

[0103] The large-scale antenna system in this embodiment takes a TDD Massive MIMO system as an example. Such as figure 1 As shown, the channel rank reduction method of the large-scale antenna system in this embodiment includes:

[0104] Step 110, performing calibration detection on the channel of the antenna, and judging whether there is a fault in the channel according to the detection result;

[0105] Step 120, perform channel rank reduction processing according to the judgment result of whether there is a fault in the channel.

[0106] In order to keep the amplitude and phase consistent between the antenna channels in a large-scale antenna system, antenna correction is required. If there is no antenna correction, the performance of beamforming will be affected, and the ideal beamforming effect will not be achieved. During the calibration process, calibration testing is required, and channel calibration is performed based on the testing results. If the detection result i...

Embodiment 2

[0161] The large-scale antenna system in this embodiment takes an FDD Massive MIMO system as an example. This embodiment is basically the same as the channel rank reduction method in Embodiment 1. The difference is that channel reciprocity does not need to be considered in the FDD system. Therefore, when performing rank reduction processing on the reference channel, the uplink reference channel and downlink reference Channels are processed separately, specifically:

[0162] In this embodiment, the rank reduction processing of the channel is performed according to the judgment result of whether there is a fault in the channel, including:

[0163] If there is no fault in the reference channel in both directions, the rank reduction of the reference channel is not performed;

[0164] If there is a fault in the reference channel in at least one direction, and all the alternative reference channels in this direction have faults, then perform the rank reduction of the reference chan...

Embodiment 3

[0174] The large-scale antenna system in this embodiment may be an FDD Massive MIMO system, or a TDD Massive MIMO system. On the basis of the channel rank reduction method in Embodiment 1 or Embodiment 2, the channel rank reduction method of this embodiment adds the processing of counting the number of faulty channels. When there are too many faulty channels, a rank reduction processing method is adopted. When there are not many channels, the rank reduction processing method in Embodiment 1 or Embodiment 2 is adopted.

[0175] Specifically, in this embodiment, after judging whether there is a fault in the channel, the number of faulty channels is counted; and according to the judgment result of whether the channel is faulty, the rank reduction processing of the channel includes: first judging whether the number is greater than or equal to corresponding number threshold;

[0176] If so, then turn off the beamforming function of the large-scale antenna system, and turn off the ...

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Abstract

A channel rank reduction method and apparatus for a large-scale antenna system. The method comprises: performing correction detection on a channel of an antenna, and determining whether a fault exists on the channel according to the detection result; and performing channel rank reduction processing according to the determining result indicating whether the fault occurs on the channel. The apparatus comprises: a detection determining module, configured to perform correction detection on a channel of an antenna, and determine whether a fault exists on the channel according to the detection result; and a rank reduction processing module, configured to perform channel rank reduction processing according to the determining result indicating whether the fault occurs on the channel. By using the channel rank reduction method and apparatus in the present application, when part of antennas are damaged, a fault channel can be accurately located, and rank reduction processing can be performed on the fault channel, so that negative effects due to damage of the antennas are remedied, thereby improving the reliability and stability of a large-scale antenna system.

Description

technical field [0001] The present invention relates to communication technology, and more specifically, to a channel rank reduction method and device for a large-scale antenna system. Background technique [0002] In a massive (Massive) multiple-input multiple-output (MIMO: Multiple-Input Multiple-Output)) antenna system, due to the large number of channels designed, some products have 64 channels, some have 128 channels, and some products have 256 channels. . In the work of the field system after commercial use, it is inevitable that some channels will fail. This requires avoiding the adverse effects of one or several channel failures on the overall function and performance of the system, and proposing a method to ensure the normal operation of the system. [0003] In the Massive MIMO multi-antenna system, the beamforming (BF: Beamforming) technology is mainly used to make the air interface channels tend to be orthogonal by performing beamforming on the multi-antenna arr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/06
CPCH04B7/0663H04L1/0612H04L1/0681H04L1/06
Inventor 张孝中刘燕武李荣泽
Owner ZTE CORP
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