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International Conference on Information science and technology (ICIST)

作者： Jianting Cao Qibin Zhao Lihua Gui Graduate School of Engineering Saitama Institute of Technology Saitama Japan Laboratory for Advanced Brain Signal Processing RIKEN Brain Science Institute Wakoshi Saitama Japan

In this paper, we propose a tensor-based non-local filtering technique for image and MRI denoising using Bayesian CP factorization (BCPF). This approach simply groups together similar sub-tensors (e.g., 3D tensors) selected from a noisy tensor and forms a 4D stack, then decomposes this stack into latent factors by employing BCPF, resulting in a filtered group of 3D sub-tensors. This procedure is repeated across the entire tensor in sliding window fashion to obtain the denoised result of original tensor. Our Bayesian CP factorization can learn CP-rank as well as noise variance solely from the observed noisy tensor data, which can also avoid overfitting problem by employing a fully Bayesian treatment for latent factor inference. The main advantage of our method is that the standard deviation of Gaussion noise can be automatically inferred and not necessary to be fixed. The experimental results on image and MRI denoising demonstrate the superiorities of our method in terms of flexibility and performance, as compared to other tensor-based denoising methods.

关键词： Tensile stress Noise reduction Bayes methods Magnetic resonance imaging Three-dimensional displays Noise measurement Image denoising

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Research on target model and echeos spatial correlation of distributed radar

Research on target model and echeos spatial correlation of d...

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IET International radar Conference 2015

作者： Song, K.K. Sun, T. Peng, H.F. Li, K. National Key Laboratory of Science and Technology On Blind Signal Processing ChengDu China

ISBN: (纸本)9781785610387

The spatial correlation of target echoes is important to jointly process signals received at each radar substation in distributed radar system. On the background of space surveillance with two independent monostatic radars, a three-dimensional cylinder target scattering model and echo signal model are built combined the orbital motion. The echoes spatial correlation is analysed and correlation coefficient which varies with the included angle between two radars and target is derived. The reasonableness of target scattering model and validity of theoretical analysis are proved via simulation examples.

关键词： Space-based radar

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Reconstruct LDPC codes in an error-free environment 4

Reconstruct LDPC codes in an error-free environment

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4th International Conference on Computer science and Network technology, ICCSNT 2015

作者： Bao, Xin Huang, Yuanling Gan, Wenya You, Ling National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

ISBN: (纸本)9781467381727

This paper presents two algorithms to recover LDPC codes in an error-free environment. Both algorithms reconstruct the sparse parity-check matrices of LDPC codes based on elementary row transformation, and are equivalent to recognize LDPC codes. The first one is appropriate to the LDPC codes whose parity-check matrices have the double-diagonal structure;the second one is a general algorithm that ensures the second-best solution for every type of LDPC codes. Simulation results show that, these algorithms work well with most of LDPC standards and protocols, including 802.16e, 802.11n, DVB-S2 GJB7296 and GB20600. © 2015 IEEE.

关键词： Errors

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Delaunay triangulation and mesh grid combining algorithm for multiple targets localization using compressive sensing

Delaunay triangulation and mesh grid combining algorithm for...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Xiaofei Lin Kangyong You Wenbin Guo Wireless Signal Processing and Network Lab Beijing University of Posts & Telecommunications Beijing China Science and Technology on Information Transmission Dissemination in Communication Networks Laboratory Shijiazhuang China

ISBN: (纸本)9781509053773

Introducing compressive sensing theory to solve multiple targets localization problem is a promising method by only considering received signal's power. In previous researches, the targets are assumed to be positioned into an regular mesh grid and restoration model according to compressive underdetermined equation is built to recover the positions of unknown targets. However, it is inconvenient to arrange sensors on grids in practice and the recovered locations were bound to grid points that may deviate the target positions comparing to the real ones. In this paper, we propose a Delaunay triangulation grid generation algorithm through randomly deployed sensors' positions. Moreover, a sparse position vector diversity combining algorithm, based on OMP, is also been proposed. It lowers the possibility of the emergence of the false locations and greatly improves the accuracy of targets' positions.

关键词： Sensors Diversity reception Topology Wireless sensor networks Position measurement Compressed sensing Wireless communication

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Tunable substrate integrated waveguide bandpass filter using liquid crystal material

Tunable substrate integrated waveguide bandpass filter using...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Zhiyong Guo Yupeng Liu Tao Yang Lei Xia Ruimin Xu Di Jiang Baichuan Gan Weiping Cao School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu China Fundamental Science on EHF Laboratory University of Electronic Science and Technology of China Chengdu China Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin University of Electronic Technology Guilin China

ISBN: (纸本)9781509047444

A microwave tunable substrate integrated waveguide bandpass filter using nematic liquid crystals is researched in this paper combined with the complementary split-ring resonators. The nematic liquid crystal is used to control the corresponding working frequency, with its permittivity changing caused by deflection angle of the liquid crystal molecules. And its deflection angle changing is controlled by the bias voltage. The simulation results show that the permittivity of liquid crystal changes from 2.79 to 3.56 to make the passband frequency achieve 490 MHz frequency offset.

关键词： Microwave filters Band-pass filters Liquid crystals Resonator filters Tuning Resonant frequency Permittivity

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Coherent oscillations of driven rf SQUID metamaterials

arXiv

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arXiv 2017年

作者： Trepanier, Melissa Zhang, Daimeng Mukhanov, Oleg Koshelets, V.P. Jung, Philipp Butz, Susanne Ott, Edward Antonsen, Thomas M. Ustinov, Alexey V. Anlage, Steven M. Department of Physics CNAM University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States Hypres Inc. 175 Clearbrook Road ElmsfordNY10523 United States Laboratory of Superconducting Devices for Signal Detection and Processing Kotelnikov Institute of Radio Engineering and Electronics Moscow125009 Russia Physikalisches Institut Karlsruhe Institute of Technology Germany Russian Quantum Center National University of Science and Technology MISIS Moscow119049 Russia

Through experiments and numerical simulations we explore the behavior of rf SQUID (radio frequency superconducting quantum interference device) metamaterials, which show extreme tunability and nonlinearity. The emergent electromagnetic properties of this metamaterial are sensitive to the degree of coherent response of the driven interacting SQUIDs. Coherence suffers in the presence of disorder, which is experimentally found to be mainly due to a dc flux gradient. We demonstrate methods to recover the coherence, specifically by varying the coupling between the SQUID meta-atoms and increasing the temperature or the amplitude of the applied rf flux. Copyright © 2017, The Authors. All rights reserved.

关键词： Metamaterials

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A combined feature representation of deep feature and hand-crafted features for person re-identification

A combined feature representation of deep feature and hand-c...

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IEEE International Conference on Progress in Informatics and Computing (PIC)

作者： Youjiao Li Li Zhuo Xiaochen Hu Jing Zhang Signal & Information Processing Laboratory Beijing University of Technology Beijing China Department of Computer Science and Technology Shandong University of Technology Zibo China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing China

ISBN: (纸本)9781509034857

Person re-identification is one of the hot topics in computer vision. How to design a robust feature representation to identify pedestrians is a key problem for person re-identification. In this paper, a feature representation based on Multi-Statistics Cascade on Pyramid (MSCP) is proposed for person re-identification. The MSCP feature is composed of deep PCA network feature and hand-crafted features of Local Maximal Occurrence (LOMO) feature and color correlogram. MSCP can characterize the pedestrian images precisely from both global and local views. The Cross-view Quadratic Discriminant Analysis (XQDA) is employed to learn the distance metric of MSCP features. And then a novel re-identification method based on MSCP and XQDA is achieved. Experimental results on VIPeR Dataset demonstrate that our proposed method can achieve superior identification performance compared with six state-of-art methods.

关键词： Feature extraction Image color analysis Measurement Histograms Principal component analysis Robustness Lighting

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Receiver disposition optimization in distributed passive radar imaging

Receiver disposition optimization in distributed passive rad...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Xianyang Hu Shunsheng Zhang Zhongguo Lu Wen-Qin Wang Jinyu Xiong Research Institute of Electronic Science and Technology University of Electronic Science and Technology of China Chengdu China Department of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu China National Defense Key Laboratory on Blind Signal Processing Chengdu China

Distributed passive radar imaging has been an emerging topic in radar imaging society because of its low-cost, increased-survivability and robustness. In the inverse problem of distributed passive imaging, location of receivers affects imaging quality a lot, while illuminators of opportunity remain to be uncontrollable. Therefore, we investigate the problem of receiver disposition optimization and propose the optimal scheme to locate those receivers by combining genetic algorithm(GA) with compressive sensing(CS) based imaging technique. Simulation results validate the effectiveness of the proposed algorithm.

关键词： Imaging radar imaging Receivers Passive radar Optimization Image reconstruction Transmitters

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Ka band small dual reflector antenna fed by dielectric rod antenna

Ka band small dual reflector antenna fed by dielectric rod a...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Xinhua Yu Gengfei Wu Weiping Cao Simin Li Gan Huang Xinjian Niu Key Laboratory of Cognitive Radio and Information Processing Ministry of Education Guilin China Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin University of Electronic Technology Guilin China School of Information and Communication Guilin University of Electronic Technology Guilin China University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781509047444

A high efficient electrically small dual reflector antenna is designed and measured. A dielectric rod antenna(DRA) is used as the feed of the dual reflector antenna, due to its advantages of narrow beam, high gain and radiates a rotationally symmetric radiation pattern. Simulations and measurements show that the maximum efficiency of 62.5% is achieved for a main reflector with only 12 wavelengths.

关键词： dielectric rod antenna high efficient electrically small dual reflector antenna

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Coupling reduction of closely packed antennas by stringing EBG structure

Coupling reduction of closely packed antennas by stringing E...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： L. Peng K. Sun J. Y. Xie Y. J. Qiu X. Jiang Guangxi Experiment Center of Information Science Guilin Guangxi China Guangxi Wireless Broadband Communication and Signal Processing Key Laboratory Guilin University of Electronic Technology Guilin Guangxi China

ISBN: (纸本)9781509047444

A stringing Electromagnetic ban-gap (S-EBG) structure is proposed in this paper for coupling reduction of microstrip antenna array. The The S-EBG is constructed by interlinking three mushroom-type EBG in a line with a strip. While in the antenna element assembling direction, it is only one period and maintains a compact array. The structure is easy fabrication, assembling and no etching in the ground plane. A reference microstrip antenna array (RMAA), one conventional mushroom-type (CMT-EBG) element loaded microstrip antenna array (O-CMT-EBG-LMAA), and three CMT-EBG elements loaded microstrip antenna array (T-CMT-EBG-LMAA) were also studied. Research found over 20 dB coupling reduction is achieved by the S-EBG. Thus, the proposed S-EBG is good candidate for array coupling reduction.

关键词： microstrip antenna array Coupling reduction Electromagnetic ban-gap (EBG) closely packed

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