Zi-Jing Zhang

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In this paper, we consider the problem of detecting a signal in Gaussian noise with unknown covariance matrix, in partially homogeneous environments where the test and training data samples share the same noise covariance matrix up to an unknown scaling factor. One solution to this problem is the adaptive subspace detector (ASD) with a single or multiple(More)
The adaptive subspace detector (ASD), which is developed to handle detection problems in partially homogeneous environments where test and training data samples share the same noise covariance matrix up to an unknown scaling factor, has been evaluated in terms of probabilities of false alarm and detection. However, the probability of false alarm of the ASD(More)
In this paper, we address the performance optimization of adaptive detectors in Gaussian noise with unknown covariance matrix, based on a diversely polarized antenna (DPA). First, a general signal model is presented, where the system response is related to the characteristics of its transmitted pulses. Two adaptive detectors, i.e., generalized likelihood(More)
Based on a diversely polarized antenna, we address the problems of adaptive detection and performance enhancement in partially homogeneous environments where the test and training data samples share the same noise covariance matrix up to an unknown scaling factor. The matched subspace detector and adaptive subspace detector are employed to handle the(More)
An efficient iterative algorithm is first proposed for the design of biorthogonal cosine modulated filter banks (CMFBs) with nearly perfect reconstruction. The design problem is formulated as a quadratic unconstrained least-squares minimization problem, in which the gradient vector of the objective function with respective to unknown parameters can be(More)
Reactive oxygen species (ROS) are closely related to the follicular granulosa cell apoptosis. Grape seed procyanidin B2 (GSPB2) has been reported to possess potent antioxidant activity. However, the GSPB2-mediated protective effects and the underlying molecular mechanisms in granulosa cell apoptosis process remain unknown. In this study, we showed for the(More)