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Moving target DOA (direction of arrival)-based null broadening 3D-MIMO beamforming method

A beamforming method and 3D-MIMO technology, which is applied in the field of zero-notching extended 3D-MIMO beamforming based on moving target DOA, can solve the problems of misalignment, mismatch, and beamforming performance degradation of interference, etc. Achieve high speed requirements and improve spectral efficiency

Active Publication Date: 2017-09-19
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, in practice, due to the change of signal DOA, the direction of interference will be misaligned with the position of the null trap and the desired signal direction will be slightly mismatched, so that the signal output by beamforming contains unsuppressed interference signals
Steering vector mismatch can degrade beamforming performance

Method used

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  • Moving target DOA (direction of arrival)-based null broadening 3D-MIMO beamforming method

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Embodiment Construction

[0066] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0067] The present invention relates to terminal user mobility scenarios in 3D-MIMO (3-Dimensional Multiple-Input Multiple-Output), such as figure 1 As shown, θ 0 Indicates the initial horizontal angle between the mobile terminal and the BS, θ 1 Indicates the horizontal direction angle after moving; Δθ indicates the angle difference; d 0 Indicates the initial distance between the base station and the mobile terminal; d 1 Indicates the distance between the mobile terminal and the base station after moving. t 0 represents the initial time, t 1 represents the time after the movement, and Δt represents the time difference.

[0068] For the communication base station BS and a mobile terminal MES, when the target terminal enters the interference area, the change of the incident signal DOA or the estimation error will lead to the degradation of the bea...

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Abstract

The present invention discloses a moving target DOA (direction of arrival)-based null broadening 3D-MIMO beamforming method and belongs to the interference suppression field. The method includes the following steps that: on the basis of existing 3D-MIMO beamforming, an antenna array of M*N array elements is constructed on an xy plane for a base station and a certain mobile terminal which communicates with each other; the weight of each of array factors is calculated; DOA information between a target mobile terminal and the base station as well as between an interference mobile terminal and the base station is determined; the weight of each array factor is re-adjusted according to the DOA information; and constraint is applied to angle regions around a desired direction and an undesired direction, null broadening is performed in the undesired direction, and distortion does not appear in the desired direction. With the method adopted, the problem of the decrease of interference suppression capability in the case of small null width under a user mobile condition can be solved, the robustness of a system is improved, and therefore, the interference of position change can be effectively suppressed, and desired signals can be nearly distortion-free, spectral efficiency is effectively increased, and a requirement for higher rates can be satisfied.

Description

technical field [0001] The invention belongs to the field of interference suppression, and in particular relates to a zero trap expansion 3D-MIMO beamforming method based on moving target DOA. Background technique [0002] According to the "5G Vision and Requirements White Paper", the wide-area coverage scenario supported by 5G will provide users with an experience density of up to 10Mbit / s, and support data traffic density in hotspot areas up to 10Gbit / s experience rate and 10Tbit / km2 data density. However, traditional MIMO antennas are not only small in number and poor in control ability, but also have low performance and focused applications of functions such as spatial multiplexing, spatial diversity, and beamforming, which are also unacceptable for 5G. [0003] 3D-MIMO technology is one of the key technologies of 5G. On the basis of 2D-MIMO technology, the spatial degree of freedom in the vertical direction is increased, which can improve system capacity, increase spect...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08
CPCH04B7/0617H04B7/086
Inventor 胡欣李博王卫东刘帅军崔高峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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