The static nonlinear feature of narrow band Radio Frequency Power Amplifier (RF PA) is made as the fingerprint of wireless communication emitter. RF PA with unknown input can be looked as a static nonlinear Hammerstei...
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The static nonlinear feature of narrow band Radio Frequency Power Amplifier (RF PA) is made as the fingerprint of wireless communication emitter. RF PA with unknown input can be looked as a static nonlinear Hammerstein model. The process of feature extraction from this model is split into two steps. The first step is signal samples whitening and the second is the estimation of Taylor series' coefficients. The order statistics of the whitening signal samples is monotone. Then the features are estimated through linear regression using least square method. Comparing feature vectors of 4 RF power amplifiers results in that the proposed algorithm is effectively to identification different type of RF power amplifiers.
Natural image classification is an important task. SIFT descriptors and bag-of-visterms (BOV) method have achieved very good results based on local image representation. Many studies use the support vector machine to ...
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This paper presents the robust of Sliding Mode controller according to parameters change and worst signal noise. Mathematical procedure for calculating the values of the gains of Sliding Mode controller (SMC) and equa...
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Radial basis function (RBF) network is one of the significant neural networks. It has been used successfully in various fields. But in RBF network approximation algorithm, the initial value of the network weights, Gau...
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On the basis of the general technology, high-tech, vast varieties and small-lot of the solar energy photovoltaic system, this paper comes up with the research conception of optical, mechanical and electronic integrati...
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On the basis of the general technology, high-tech, vast varieties and small-lot of the solar energy photovoltaic system, this paper comes up with the research conception of optical, mechanical and electronic integration and builds the optical, mechanical and electronic integration systemIt also brings forward the design methodology and the integrated mechanism of the instant systematic integration based on the flexible interconnection, which leads to the building of the basic experimental and research environment of the automatic integrated designThe application of this new technology is based on the research of the highly-efficient Concentrator Photovoltaic SystemIt noticeably improves the technical level as well as the research efficiency.
In this paper, an advanced PSO has been proposed to solve multi-modal functions optimization. Multiple swarms are used to optimize parallel search and artificial repulsive potential field on local points are set up to...
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In order to conduct in-depth study of flexible R&D platform for solar concentration photovoltaic system, the author proposes the design method for flexible R&D platform for solar concentration photovoltaic ...
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In order to conduct in-depth study of flexible R&D platform for solar concentration photovoltaic system, the author proposes the design method for flexible R&D platform for solar concentration photovoltaic system based on ontology and knowledge fusion. This paper explains the integration concept of flexible R&D platform, explores the way of acquiring and expressing multi-source knowledge for solar concentration photovoltaic system design, and further studies the key technologies and realization way for solar concentration photovoltaic system design based on multi-source knowledge fusion.
In this paper a compact and wideband planar inverted-F antenna (PIFA) with metamaterial loaded on the ground plane is proposed. The metamaterial units, composed of an array of Jerusalem crosses PEC structure, improve ...
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In this paper a compact and wideband planar inverted-F antenna (PIFA) with metamaterial loaded on the ground plane is proposed. The metamaterial units, composed of an array of Jerusalem crosses PEC structure, improve the performance of the antenna and cause a special characteristic of backward radiation. Simulation results show that this novel antenna has a bandwidth of 49.4%, which is from 2.56 GHz to 4.24 GHz. Compared to a conventional PIFA simulated in this paper, the proposed antenna has a reduction of 91% in dimension. And the antenna has a gain over 3 dB within the whole bandwidth.
Automatic speech recognition (ASR) often fails in acoustically noisy environments. Aimed to improve speech recognition scores of an ASR in a real-life like acoustical environment, a speech pre-processing system is pro...
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High-end CNC machine tool is the main production equipment in the modern manufacturing industry, and its stability and reliability on operation state is directly linked to the machining accuracy and efficiency. In ord...
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High-end CNC machine tool is the main production equipment in the modern manufacturing industry, and its stability and reliability on operation state is directly linked to the machining accuracy and efficiency. In order to guarantee effectively the reliable stable and safe operation, the test study is conducted to the data acquisition and database based on high-end CNC machine tool. In this paper, the study of high-end CNC machine tool is focused on building the condition monitoring and test platform with the typical functional components. The method of data acquisition is presented, knowledge base and knowledge model are designed, the test platform of remote network data acquisition is built and real time data will be transferred to different client. A key technology is presented to reveal the dynamic performance of failure development and accuracy degradation mechanism, and the influential factors leading to failures.
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