Greedy Capon Beamformer

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2024

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Department of Information and Communications Engineering

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Language

en

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IEEE Signal Processing Letters, Volume 31

Abstract

We propose greedy Capon beamformer (GCB) for direction finding of narrow-band sources present in the array's viewing field. After defining the grid covering the location search space, the algorithm greedily builds the interference-plus-noise covariance matrix by identifying a high-power source on the grid using Capon's principle of maximizing the signal to interference plus noise ratio while enforcing unit gain towards the signal of interest. An estimate of the power of the detected source is derived by exploiting the unit power constraint, which subsequently allows to update the noise covariance matrix by simple rank-1 matrix addition composed of outerproduct of the selected steering matrix with itself scaled by the signal power estimate. Our numerical examples demonstrate effectiveness of the proposed GCB in direction finding where it performs favourably compared to the state-of-the-art algorithms under a broad variety of settings. Furthermore, GCB estimates of direction-of-arrivals (DOAs) are very fast to compute.

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Publisher Copyright: © 1994-2012 IEEE.

Keywords

Beamforming, direction finding, greedy pursuit, MVDR beamforming, source localization

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DOI

10.1109/LSP.2024.3475351

Citation

Ollila, E 2024, ' Greedy Capon Beamformer ', IEEE Signal Processing Letters, vol. 31 . https://doi.org/10.1109/LSP.2024.3475351

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https://urn.fi/URN:NBN:fi:aalto-202411137116

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