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A Semi-virtual Antenna Array Beamforming Method Based on Covariance Matrix Expansion

A covariance matrix, semi-virtual technology, applied in diversity/multi-antenna systems, radio transmission systems, space transmit diversity and other directions, to achieve the effect of good performance

Active Publication Date: 2018-08-17
HARBIN ENG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The virtual antenna technology obtains better antenna array performance by constructing virtual array elements, because the existence of virtual array elements is equivalent to increasing the number of antenna array elements, and there is additional processing gain

Method used

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  • A Semi-virtual Antenna Array Beamforming Method Based on Covariance Matrix Expansion
  • A Semi-virtual Antenna Array Beamforming Method Based on Covariance Matrix Expansion
  • A Semi-virtual Antenna Array Beamforming Method Based on Covariance Matrix Expansion

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specific Embodiment approach

[0049] Step 1: Use the identity matrix I and the covariance matrix R of the data received by the array to do the Kronecker product to obtain the covariance expansion matrix such as:

[0050]

[0051] Step 2: Expand the steering vector by Kronecker product operation such as:

[0052]

[0053] Where a(θ) represents the steering vector of the antenna array, and b(θ) represents the steering vector of the semi-virtual antenna array.

[0054] Step 3: Calculate the optimal weight of the Capon (CME-Capon) beamformer based on covariance matrix expansion as

[0055]

[0056] in Denotes the optimal weight of the CME-Capon beamformer, b(θ d ) represents the desired signal steering vector of the semi-virtual antenna array.

[0057] Step 4: Perform beamforming to obtain the output data of the array antenna.

[0058] Method of the present invention adopts following simulation to verify:

[0059] Simulation conditions: Considering the far-field narrow-band situation, the adapti...

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Abstract

The invention discloses a para-virtual antenna array beamforming method based on covariance matrix extending. The method comprises the following steps: step 1, extending the covariance matrix of data received by an array to obtain an extended covariance matrix; step 2, extending the steering vector of the antenna array to obtain the steering vector of a para-virtual antenna array; step 3, calculating the optional weight of a Capon beamformer based on covariance matrix extending; and step 4, carrying out beamforming by virtue of the optional weight to obtain the output data of the antenna array. According to the para-virtual antenna array beamforming method based on covariance matrix extending, a higher output SINR (signal to interference plus noise ratio) can be obtained through constructing virtual array elements; and through suppressing interference with known direction by constraint conditions, interference with hyper degrees of freedom can be suppressed.

Description

technical field [0001] The invention belongs to the control field of antenna arrays, in particular to a semi-virtual antenna array beamforming method based on covariance matrix expansion. Background technique [0002] Adaptive antenna beamforming technology can form the maximum gain in the direction of the desired signal and form a null in the interference direction, and is widely used in radar, sonar, mobile communication and other fields. The Minimum Variance Distortionless Response (MVDR, also known as Capon) beamformer can improve the output signal-to-interference-noise ratio of the adaptive antenna. work in the case of antenna array degrees of freedom. [0003] The virtual antenna array is aimed at the problem that the adaptive antenna cannot work when the interference number exceeds the degree of freedom of the antenna array. It is an antenna form developed on the basis of the adaptive antenna. The main research is to add virtual array elements and transform the actua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/0456
CPCH04B7/043H04B7/0456
Inventor 李文兴赵宇李思毛云龙
Owner HARBIN ENG UNIV
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