uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
On estimation of covariance matrices with Kronecker product structure.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
2008 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, Vol. 56, no 2, 478-491 p.Article in journal (Refereed) Published
Abstract [en]

The estimation of signal covariance matrices is a crucial part of many signal processing algorithms. In some applications, the structure of the problem suggests that the underlying, true covariance matrix is the Kronecker product of two valid covariance matrices. Examples of such problems are channel modeling for multiple-input multiple-output (MIMO) communications and signal modeling of EEG data. In applications, it may also be that the Kronecker factors in turn can be assumed to possess additional, linear structure. The maximum-likelihood (ML) method for the associated estimation problem has been proposed previously. It is asymptotically efficient but has the drawback of requiring an iterative search for the maximum of the likelihood function. Two methods that are fast and noniterative are proposed in this paper. Both methods are shown to be asymptotically efficient. The first method is a noniterative variant of a well-known alternating maximization technique for the likelihood function. It performs on par with ML in simulations but has the drawback of not allowing for extra structure in addition to the Kronecker structure. The second method is based on covariance matching principles and does not suffer from this drawback. However, while the large sample performance is the same, it performs somewhat worse than the first estimator in small samples. In addition, the Cramer-Rao lower bound for the problem is derived in a compact form. The problem of estimating the Kronecker factors and the problem of detecting if the Kronecker structure is a good model for the covariance matrix of a set of samples are related. Therefore, the problem of detecting the dimensions of the Kronecker factors based on the minimum values of the criterion functions corresponding to the two proposed estimation methods is also treated in this work.

Place, publisher, year, edition, pages
2008. Vol. 56, no 2, 478-491 p.
Keyword [en]
covariance matching, Cramer-Rao bound, Kronecker model, multiple-input multiple-output (MIMO) channel modeling, structured covariance matrix estimation
National Category
Computer and Information Science
URN: urn:nbn:se:uu:diva-104185DOI: 10.1109/TSP.2007.907834ISI: 000252575200004OAI: oai:DiVA.org:uu-104185DiVA: diva2:219502
Available from: 2009-05-27 Created: 2009-05-27 Last updated: 2010-01-15Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Stoica, Peter
By organisation
Division of Systems and ControlAutomatic control
In the same journal
IEEE Transactions on Signal Processing
Computer and Information Science

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 193 hits
ReferencesLink to record
Permanent link

Direct link