Performance Analysis of an Improved MUSIC DoA Estimator
Por:
Vallet, P, Mestre, X, Loubaton, P
Publicada:
1 ene 2015
Resumen:
This paper addresses the statistical performance of subspace DoA estimation using a sensor array, in the asymptotic regime where the number of samples and sensors both converge to infinity at the same rate. Improved subspace DoA estimators were derived (termed as G-MUSIC) in previous works, and were shown to be consistent and asymptotically Gaussian distributed in the case where the number of sources and their DoA remain fixed. In this case, which models widely spaced DoA scenarios, it is proved in the present paper that the traditional MUSIC method also provides DoA consistent estimates having the same asymptotic variances as the G-MUSIC estimates. The case of DoA that are spaced of the order of a beamwidth, which models closely spaced sources, is also considered. It is shown that G-MUSIC estimates are still able to consistently separate the sources, while this is no longer the case for the MUSIC ones. The asymptotic variances of G-MUSIC estimates are also evaluated. © 2015 IEEE.
Filiaciones:
Vallet, P:
Univ Bordeaux, CNRS, Bordeaux INP, Lab Integrat Mat Syst, F-33405 Talence, France
Mestre, X:
CTTC, Barcelona 08860, Spain
Loubaton, P:
Univ Paris Est MLV, CNRS, Lab Informat Gaspard Monge, F-77454 Marne La Vallee, France
Green Submitted, All Open Access; Green Open Access
|