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We show that the recently proposed (enhanced) principal-singular-vector utilization for modal analysis (PUMA) estimator for array processing [C. Qian, L. Huang, N. Sidiropoulos, and H. C. So, “Enhanced PUMA for direction-of-arrival estimation and its performance analysis,” IEEE Trans. Signal Process., vol. 64, no. 16, pp. 4127–4137, Aug. 2016], minimizes the same criterion function as the well-established...
The Capon method is a powerful nonparametric approach in array processing based on the sample covariance matrix. For small sample sets, however, its performance is degraded. In this paper we formulate a regularized covariance matching framework based on the nuclear norm for enhancing the Capon method. An approximate iterative solution is developed and tested using simulated data. Appropriate regularization...
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