Robust adaptive beamforming method based on data correlation constraint

A robust adaptive, data-related technology, applied in the field of signal processing, can solve problems such as high computational complexity, achieve the effect of improving robustness, reducing complexity, and avoiding signal self-cancellation

CN110727915AActive Publication Date: 2020-01-24UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-01-24

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Abstract

The invention provides a robust adaptive beamforming method based on data correlation constraints. The method comprises the following steps: calculating a sample covariance matrix, and carrying out eigenvalue decomposition on the sample covariance matrix; reconstructing an expected signal covariance matrix by using the Capon spatial spectrum to solve an optimization problem about a steering vectorof the interested signal; and calculating an optimal steering vector, and then obtaining an optimal weight vector. By establishing the optimization problem related to the sensitivity of the beamformer, signal self-cancellation can be avoided, and the weight vector is prevented from converging to an interference component in a sample covariance. And in addition, in the solving process of the optimization problem, the calculation complexity is reduced through ingenious transformation, so that the algorithm not only improves the robustness of the system, but also reduces the calculation complexity.
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Description

technical field

[0001] The invention belongs to the field of signal processing, in particular to a robust adaptive beamforming method based on data correlation constraints. Background technique

[0002] As an important research direction of array signal processing, beamforming technology is widely used in wireless communication, radar, sonar, seismic survey and radio astronomy and other fields. Its essence is to perform weighted spatial filtering on each array element, so that the main lobe of the beam is aligned to enhance the desired signal (Signal of interest, SOI), and the side lobes and nulls are aligned to the interference signal, thereby improving the signal-to-interference-plus-noise ratio (Signal of interest). to Interference plus Noise Ratio, SINR). The common Capon beamformer can get a good output signal-to-noise ratio when the covariance matrix and steering vector are known accurately. There is a certain error in the covariance matrix and the steering vector, s...

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Embodiment Construction

[0040] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0041] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the compo...