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Steering vector uncertainties and diagonal loading

Vincent, François and Besson, Olivier Steering vector uncertainties and diagonal loading. (2004) In: Security Analysis and Modelling - SAM 2004, 18-21 Jul 2004, Sitges, Spain .

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Official URL: http://dx.doi.org/10.1109/SAM.2004.1502963

Abstract

In this paper, we study the performance of diagonally loaded beamformers in the presence of steering vector errors i.e. when there exists a mismatch between the actual steering vector of interest and the presumed one. We consider the problem of optimally selecting the loading level with a view to maximise the signal to interference plus noise ratio. Ignoring finite-sample effects we show that, in the presence of strong low-rank interference and broadband noise, the optimal loading level is negative. Numerical simulations attest to the validity of the analysis and show that diagonal loading with the optimal loading factor derived herein provides a performance close to optimum. It is also shown that negative diagonal loading is effective in finite-sample as long as the steering vector errors dominate over the finite-sample errors.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to the Institute of Electrical and Electronics Engineers (IEEE). The original PDF can be found on the IEEE website: http://dx.doi.org/10.1109/SAM.2004.1502963
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Laboratory name:
Département d'Electronique, Optronique et Signal - DEOS (Toulouse, France) - Signal, Communication, Antenne et Navigation - SCAN
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Deposited By: Francois VINCENT

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