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In this paper, we propose a secrecy communication scheme for half-duplex amplify-forward relay networks in the presence of multiple eavesdroppers. Unlike conventional relay network, we consider that the relay is “green”, i.e., it is powered by the energy harvested from the relay observations. The transmission can be divided into two time slots. In the first time slot, the source and destination transmit...
In this paper, an adaptive fuzzy controller with supervisory compensator is proposed for a MEMS gyroscope. The parameters of the membership functions are determined on-line by a Lyapunov based adaptive controller. A fuzzy controller is employed to approximate and compensate the unknown system nonlinearities. A supervisory compensator is adopted to guarantee the stability of the closed-loop system...
For high resolution spaceborne SAR system, the errors caused by straight trajectory assumption and stop-go approximation cannot be ignored. In this paper, an algorithm is proposed to compensate the above errors. First, a novel modified hyperbolic range equation (MHRE) is introduced to describe the satellite's orbit which is more precise than the traditional hyperbolic range equation (THRE). Then,...
Reconstruction from only a limited number of projections is an important problem in medical imaging. In this paper, a novel kernel-based limited-view CT reconstruction method is proposed. First based on the classical FDK algorithm, we derive the reconstruction kernel. Then the FDK kernel is truncated to reduce the noises aroused by the oscillations of the kernel. And a novel anisotropic diffusion...
It is well known that Tuy's inversion formula is not generally implemented in practice. Recently, based on approximate inverse where reconstruction kernels are precomputed independently, a fast inversion algorithm has been derived from the 3D inverse Radon transform with the classical single-circular trajectory. In this paper, based on the relationship between Tuy's formula and the 3D inverse Radon...
Sparse signal representation from overcomplete dictionaries have been extensively investigated in recent research, leading to state-of-the-art results in signal, image and video restoration. One of the most important issues is involved in selecting the proper size of dictionary. However, the related guidelines are still not established. In this paper, we tackle this problem by proposing a so-called...
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