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Spectrum sensing is a key technique in the cognitive radio. It enables secondary users to detect spectrum holes and monitor primary users' activity. However, many factors make spectrum sensing much difficult, such as very low signal-to-noise ratio, and noise uncertainty, and quite short sensing time, etc. In this paper, a uniform linear array is configured for each secondary user's receiver. The sample...
In this paper, a novel two-dimensional direction of arrival (2D DOA) estimation method is proposed when coherently distributed source exists. The second-order statistics is formed to estimate the azimuth DOA with integral steering vector expressed as Schur-Hadamard product. And then the elevation DOA is estimated using advantage of the array configuration based on the eigenstructure between the steering...
High-resolution parameter estimation techniques have recently been applied to jointly estimate multiple signal parameters. In this paper, we consider the joint frequency and 2-D DOA estimation problem. We define a novel space-time matrix which includes the information of incident frequencies and 2-D DOAs. The joint frequency and 2-D DOA estimation method used the defined space-time matrix is named...
In this paper, an effective joint direction-of-arrival (DOA) and propagation delay estimation method is proposed for multipath signals impinging the uniform linear antenna array. In this presented method, the real and imaginary parts of the ith eigenvalue of a matrix are one-to-one related to the DOA and propagation delay of the ith path's signal. Thus, the paring of the estimated DOAs and delays...
ESPRIT is a high-resolution parameter estimation techniques based on the translational invariance structure of a sensor array, which has recently been applied to the problem of determining the directions and center frequencies of a number of narrowband sources in a band of interest. Here, we present a simple and efficient method for the joint angle-frequency estimation (JAFE), named as unitary-JAFE...
High-resolution parameter estimation techniques have recently been applied to jointly estimate multiple signal parameters. In this paper, we consider the joint angle and frequency estimation (JAFE) problem. We define a novel space-time matrix which includes the information of incident angles and frequencies. The joint angle and frequency estimation method used the defined space-time matrix is named...
A computationally efficient method for 2D direction-of-arrival (DOA) estimation of coherently distributed source is presented. The key idea is to construct second-order statistics calculated analytically based on the Schur-Hadamard product steering vector. So a closed form solution to 2D DOA estimation can be derived, which does not involve any eigendecomposition or singular value decomposition as...
By exploiting the real-valued eigen decomposition (EVD) of the centro-Hermitian matrix, a novel cyclic MUSIC algorithm with signal selective property is presented by introducing a new forward backward smoothed covariance matrix. Compared with cyclic MUSIC algorithm, the proposed approach has a better performance in the presence of multipath propagation. In addition, this approach not only reduces...
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