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Robust beam forming method based on local searching

A local search and robust technology, applied in the field of communication, can solve problems such as output performance degradation, and achieve the effect of improving output performance and overcoming output performance degradation.

Active Publication Date: 2015-06-10
XIDIAN UNIV
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Problems solved by technology

However, the disadvantage of this method is that the output performance decreases when the steering vector mismatch error is large
However, the shortcomings of this method are: this method is equivalent to the diagonal loading method, and the output signal-to-interference-noise ratio will become flat with the increase of the input signal-to-noise ratio

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  • Robust beam forming method based on local searching
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  • Robust beam forming method based on local searching

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Embodiment Construction

[0043] Combine below figure 1 The present invention is further described.

[0044] Step 1, set the position of the elements of the linear antenna array.

[0045] The operator sets the positions of the elements of the linear antenna array at equal intervals in a flat area, selects the first element as the reference element, and records the position coordinates of the set antenna array elements.

[0046] Equal spacing means that the distance between adjacent antenna elements is half of the carrier wavelength of the received signal.

[0047] The array element position of the sparse array in the embodiment of the present invention refers to that the distance between adjacent array elements is half of the wavelength of the signal received by the antenna, and the coordinates of the recorded array element position are x=[x 1 ,x 2 ,...,x m ] T , where x 1 ,x 2 ,...,x m Respectively represent the abscissa values ​​corresponding to antenna receiving array element 1, antenna rece...

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Abstract

The invention discloses a robust beam forming method based on local searching. The method comprises the specific steps: (1) setting the position of an array element of an antenna array; (2) receiving a signal; (3) estimating a data covariance matrix; (4) obtaining an expected steering vector of the received signal; (5) estimating the direction angle of the received signal; (6) receiving the self-adaptive weight vector of the received signal; and (7) calculating the directional diagram of the received signal. According to the robust beam forming method provided by the invention, for linear array receiving systems which are arranged at equal interval, the Poda direction of an expected signal can be estimated by a local searching method, therefore the weight vector corresponding to an estimation direction can be obtained; furthermore, the steering vector is served as a reference steering vector of an optimal performance algorithm in a worst condition, therefore the better interference-to-noise ratio of output signals can be reached; in addition, the influence on the performance of the receiving system caused by larger mismatch error of the larger steering vector can be solved, and the capacity of the system against interference errors can be improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a local search-based robust beamforming method in the technical field of array signal processing. The invention can be used for array antennas in communication systems to receive communication signals, so as to realize that the receiving antenna array offsets the decline of system output performance caused by non-ideal environmental factors. Background technique [0002] In the communication system, the adaptive antenna can automatically adjust the weight vector according to the different signal environment to form a dynamic pattern. The technology used by the adaptive antenna is the adaptive beamforming technology, which has a series of advantages such as adaptive interference nulling, super-resolution orientation, ultra-low sidelobe, antenna self-calibration, etc., and can realize flexible power and time control at the same time. The essence of adaptive beamforming...

Claims

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Application Information

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IPC IPC(8): H04W16/28
CPCH04B7/0617H04W16/28
Inventor 王勇超陈冉程帅
Owner XIDIAN UNIV