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In this paper, the characteristics of two different uniformly spaced circular arrays are analyzed, including the beam width, the sidelobe peak level, the resolution and the Cramer-Rao bound(CRB) of the array. Firstly, according to the structure of the dual circular array, the formula of array pattern, the formula of resolution and the formula of CRB are deduced. Secondly, the effects of the elements...
We consider the physical layer security for the downlink system, where the confidential messages can be wiretapped by both the intended users (IUs) and the external eavesdroppers (EEs). Regularized channel inversion (RCI) precoding is adopted for multiuser communication because it can control the mutual information leakage among users. And, to enhance the secrecy performance, artificial noise (AN)...
In this paper, a novel method based on Toeplitz decorrelation is proposed to estimate DOAs (direction of arrivals) of the coherent sources. Using the eigenvector corresponding to the largest eigenvalue obtained from the received data covariance matrix, the presented method constructs a new Toeplitz matrix whose rank is equal to the number of sources. The presented method fully uses the property of...
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