Regularized Tapered Sample Covariance Matrix - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue IEEE Transactions on Signal Processing Année : 2022

Regularized Tapered Sample Covariance Matrix

Esa Ollila

Résumé

Covariance matrix tapers have a long history in signal processing and related fields. Examples of applications include autoregressive models (promoting a banded structure) or beamforming (widening the spectral null width associated with an interferer). In this paper, the focus is on high-dimensional setting where the dimension p is high, while the data aspect ratio n/p is low. We propose an estimator called TABASCO (TApered or BAnded Shrinkage COvariance matrix) that shrinks the tapered sample covariance matrix towards a scaled identity matrix. We derive optimal and estimated (data adaptive) regularization parameters that are designed to minimize the mean squared error (MSE) between the proposed shrinkage estimator and the true covariance matrix. These parameters are derived under the general assumption that the data is sampled from an unspecified elliptically symmetric distribution with finite 4th order moments (both real-and complex-valued cases are addressed). Simulation studies show that the proposed TABASCO outperforms all competing tapering covariance matrix estimators in diverse setups. An application to space-time adaptive processing (STAP) also illustrates the benefit of the proposed estimator in a practical signal processing setup.
Fichier principal
Vignette du fichier
J20_TSP22.pdf (1.48 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04313499 , version 1 (29-11-2023)

Identifiants

Citer

Esa Ollila, Arnaud Breloy. Regularized Tapered Sample Covariance Matrix. IEEE Transactions on Signal Processing, 2022, 70, pp.2306-2320. ⟨10.1109/TSP.2022.3169269⟩. ⟨hal-04313499⟩
2 Consultations
2 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More