Analysis of the Loading Factor Behavior in a LSMI Beamformer

Filipe de C. B. da Silveira, Ricardo Zelenovsky, Mylène C. Q. de Farias

DOI: 10.14209/sbrt.2018.28

Evento: XXXVI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2018)

Keywords: Adaptive beamforming uniform linear array (ULA) sample-matrix inversion (SMI) loaded SMI (LSMI) minimum variance distortionless response (MVDR) beamformer and loading factor

Abstract

Diagonal loading imparts robustness to adaptive beamformers. With it, the algorithm improves both its capacity of sidelobes attenuation and the signal-to-interference-plus-noise- ratio (SINR). However, setting the appropriate loading factor γ value is not a straightforward task as it is dependent on various parameters. Therefore, this paper aims to establish its behavior related to changes in certain parameters - i.e., number of antennas, number of interferers, noise power and direction-of- arrival (DOA) uncertainty. This way, the value that gives suitable SINR results can be established.

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