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Interference Coherent Robust Beamforming Method with Unknown Mutual Coupling Information Under Mutual Coupling Conditions

A condition and beam technology, applied in the field of adaptive array signal processing, can solve the problem of coherence or correlation of single solution signal source

Active Publication Date: 2020-10-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0018] The purpose of the invention is to: aiming at the situation that the existing beamforming method can only solve the coherence or correlation of signal sources, the present invention discloses a method that can effectively solve the problems of array mutual coupling and signal source coherence or correlation at the same time

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  • Interference Coherent Robust Beamforming Method with Unknown Mutual Coupling Information Under Mutual Coupling Conditions
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  • Interference Coherent Robust Beamforming Method with Unknown Mutual Coupling Information Under Mutual Coupling Conditions

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[0062] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the implementation methods and accompanying drawings.

[0063] In order to show the beamforming performance of the present invention when there is mutual coupling in the array elements and the specific information of mutual coupling is unknown, and the desired signal is coherent with the interference signal, the existing robust beamforming methods (including SMI algorithm, ESB algorithm, DL algorithm and IAA algorithm) and the beamforming method proposed by the present invention are simulated and compared, and the performance indicators of the compared beamforming method are: beamforming diagram and output signal-to-interference-noise ratio (SINR).

[0064] Simulation parameters: 12-element uniform linear array. The direction of arrival of the expected signal is -1°. Due to the inaccurate e...

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Abstract

The invention discloses an interference coherent robust beamforming method with unknown mutual coupling information under mutual coupling conditions. The invention relates to a beamforming technique belonging to the field of adaptive array signal processing. Based on the particularity of the array mutual coupling structure, the present invention respectively reconstructs the interference-plus-noise covariance matrix and the desired signal covariance matrix when the specific information of the array mutual coupling is unknown, and finally obtains the final weight vector. The present invention does not need to know the mutual coupling information in advance, and neither needs to estimate the steering vector of the desired signal, nor needs to perform any spatial smoothing decoherence processing. It maintains very good performance when the expected signal power is strong and weak, and can converge quickly.

Description

technical field [0001] The invention relates to a beamforming technology in the field of adaptive array signal processing, in particular to a robust beamforming method when mutual coupling exists in a uniform line array under the condition of unknown mutual coupling information and interference coherence. Background technique [0002] Most of the existing robust beamforming methods basically assume that the beamforming is performed under the ideal condition that the interference and the desired signal are irrelevant or mutually uncorrelated. In the actual complex communication environment, due to the existence of factors such as multipath reflection and electromagnetic interference, signal sources are often coherent or correlated. At this time, the covariance matrix of the source signal received by the array will lack rank, so that the direction vectors of some coherent sources are no longer orthogonal to the noise subspace, and nulls cannot be formed in the interference dir...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08
CPCH04B7/0857H04B7/086
Inventor 谢菊兰杨雪罗紫惠干鹏何子述
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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