SDP-Based Adaptive Beamforming with a Direction Range 


Vol. 39,  No. 9, pp. 519-527, Sep.  2014


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  Abstract

Adaptive arrays can minimize contributions from interferences incident onto an sensor array while preserving a signal the direction vector of which corresponds to the array steering vector to within a scalar factor. If there exist errors in the steering vector, severe performance degradation can be caused since the desired signal is misunderstood as an interference by the array. This paper presents an adaptive beamforming method which is robust against steering vector errors, exploiting a range of the desired signal direction. In the presented method, an correlation matrix of array response vectors is obtained through integration over the direction range and a minimization problem is formulated using some eigenvectors of the correlation matrix such that a more accurate steering vector than initially given one can be found. The minimization problem is transformed into a relaxed SDP (semidefinite program) problem, which can be effectively solved since it is a sort of convex optimization. Simulation results show that the proposed method outperforms existing ones such as ORM (outside-range-based method) and USM (uncertainty-based method).

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  Cite this article

[IEEE Style]

Y. Choi, "SDP-Based Adaptive Beamforming with a Direction Range," The Journal of Korean Institute of Communications and Information Sciences, vol. 39, no. 9, pp. 519-527, 2014. DOI: .

[ACM Style]

Yang-Ho Choi. 2014. SDP-Based Adaptive Beamforming with a Direction Range. The Journal of Korean Institute of Communications and Information Sciences, 39, 9, (2014), 519-527. DOI: .

[KICS Style]

Yang-Ho Choi, "SDP-Based Adaptive Beamforming with a Direction Range," The Journal of Korean Institute of Communications and Information Sciences, vol. 39, no. 9, pp. 519-527, 9. 2014.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880