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Coprime array adaptive beamforming method based on virtual domain spatial power spectrum estimation

An adaptive beam and power spectrum estimation technology, applied in the field of coprime array adaptive beamforming based on virtual domain spatial power spectrum estimation, can solve problems such as limited degrees of freedom

Active Publication Date: 2017-07-21
ZHEJIANG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of limited degrees of freedom in existing adaptive beamforming methods, and propose a coprime array adaptive beamforming method based on virtual domain spatial power spectrum estimation, which makes full use of the characteristics of coprime arrays to improve The degree of freedom performance of the adaptive beamformer, and the design of the beamformer weight vector based on the coprime array physical antenna elements, thereby effectively reducing the hardware and computational complexity of the overall system, and improving the output performance of beamforming

Method used

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  • Coprime array adaptive beamforming method based on virtual domain spatial power spectrum estimation

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example 1

[0087] Simulation example 1: The coprime array virtual domain spatial power spectrum P proposed by the present invention v (θ) is compared with the Capon space spectrum using a uniform array such as Figure 4 As shown, the signal-to-noise ratio is 30dB, and the number of sampling snapshots is L=500. The vertical solid line in the figure represents the desired signal direction, and the vertical dotted line represents the interference direction. Since the number of incident signal sources is greater than the number of physical antenna elements, the degree of freedom performance of the uniform array method is limited by the number of physical antenna elements, and cannot effectively distinguish all incident signal sources at the same time; in contrast, mutual Mass Array Virtual Domain Spatial Power Spectrum P v (θ) enables efficient estimation of all signal sources. It can be seen that the use of coprime array virtual domain equivalent signals can increase the degree of freedo...

example 2

[0088] Simulation Example 2: Comparison of the output SINR performance between the proposed method of the present invention and the uniform array reconstruction method Figure 5 and Image 6 shown. At the same time, the optimal value of the output SINR is also Figure 5 and Image 6 given as a reference. For each set of parameter values, the number of Monte Carlo experiments is 1000. Figure 5 For the relationship curve between the output SINR and the input SNR, the number of sampling snapshots is set to L=500; it can be seen that the output SINR trend of the proposed method of the present invention is consistent with the optimal value And it outperforms the uniform array reconstruction method. Image 6 In order to output the relationship curve between the SINR and the number of sampling snapshots, the input SNR is set to 30dB; due to the limited performance of the degree of freedom, the output SINR of the uniform array reconstruction method no longer varies with the numb...

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Abstract

Disclosed is a coprime array adaptive beamforming method based on a virtual domain spatial power spectrum estimation, mainly solving a problem of limited degree of freedom (DOF) performance in the prior art. The coprime array adaptive beamforming method based on the virtual domain spatial power spectrum estimation comprise: (1) a coprime array is constructed by a base station; (2) the coprime array is used to receive signals and modelling is performed; (3) an equivalent receipt signal of a virtual array is obtained; (4) a virtual domain spatial power spectrum of the coprime array is calculated; (5) a desired signal steering vector is reconstructed; (6) an interference and noise covariance matrix is obtained by integral reconstruction; and (7) a weight vector of a beamformer is calculated. The invention takes full advantage of an ability of the coprime array to increase a DOF so that a spatial power spectrum is calculated in a virtual domain to perform a parameter estimation and a physical antenna array element weight vector of the coprime array is designed by combining an idea of reconstruction, thereby effectively improving the DOF performance of the beamformer. The invention can be used in directed transmission and receipt of signals.

Description

technical field [0001] The present invention belongs to the technical field of signal processing, and in particular relates to beamforming for radar signals, acoustic signals and electromagnetic signals, specifically a coprime array adaptive beamforming method based on virtual domain spatial power spectrum estimation, which can be used for directional transmission and reception of signals . Background technique [0002] Beamforming is an important branch in the field of array signal processing. Taking the receiving end as an example, beamforming uses the combination of antenna technology and various digital signal processing technologies to accumulate the weights of the signals received by multiple antenna elements to enhance the array gain of the desired signal and suppress interference and noise. Adaptive beamforming can adjust the beamforming weight vector according to the external environment to ensure the stability and robustness of the system. It has important applica...

Claims

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Application Information

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IPC IPC(8): H04B7/06
CPCH04B7/0617
Inventor 史治国周成伟陈积明
Owner ZHEJIANG UNIV
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