期刊
IEEE TRANSACTIONS ON SIGNAL PROCESSING
卷 61, 期 19, 页码 4806-4821出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSP.2013.2273198
关键词
Linear shrinkage; minimum description length; sample covariance matrix; source enumeration
资金
- NSFC/RGC
- Research Grants Council of Hong Kong
- National Natural Science Foundation of China [N_CityU 104/11, 61110229/61161160564]
- National Natural Science [61222106, 61171187]
- Shenzhen Kongqie talent program [KQC201109020061A]
Numerous methodologies have been investigated for source enumeration in sample-starving environments. For those having their root in the framework of random matrix theory, the involved distribution of the sample eigenvalues is required. Instead of relying on the eigenvalue distribution, this work devises a linear shrinkage based minimum description length (LS-MDL) criterion by utilizing the identity covariance matrix structure of noise subspace components. With linear shrinkage and Gaussian assumption of the observations, an accurate estimator for the covariance matrix of the noise subspace components is derived. The eigenvalues obtained from the estimator turn out to be a linear function of the corresponding sample eigenvalues, enabling the LS-MDL criterion to accurately detect the source number without incurring significantly additional computational load. Furthermore, the strong consistency of the LS-MDL criterion for m, n -> infinity and m/n -> c is an element of (0, infinity) is proved, where m and n are the antenna number and snapshot number, respectively. Simulation results are included for illustrating the effectiveness of the proposed criterion.
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