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arXiv 2017年

作者： Fang, Ming Huang, Zhixiang Sha, Wei E.I. Wu, Xianliang Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei230039 China College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Department of Electrical and Electronic Engineering University of Hong Kong

The interaction between electromagnetic field and plasmonic nanostructures leads to both strong linear and nonlinear behaviors. In this paper, a time-domain hydrodynamic model for describing the motion of electrons in plasmonic nanostructures is presented, in which both surface and bulk nonlinearity are considered. A coupled Maxwell-hydrodynamic system capturing full-wave physics and free electron dynamics is numerically solved with the parallel finite-difference time-domain (FDTD) method. The validation of the proposed method is presented by simulating a plasmonic metasurface. The linear response is compared with the Drude dispersion model and the nonlinear terahertz emission from a difference-frequency generation process is theoretically analyzed. The work is fundamentally important to design nonlinear plasmonic nanodevices, especially for efficient and broadband THz emitters. Copyright © 2017, The Authors. All rights reserved.

关键词： Plasmonics

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Construction of One-Gray Weight Codes and Two-Gray Weight Codes over Z4+uZ4

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Journal of Systems Science & Complexity 2016年第5期29卷 1472-1484页

作者： SHI Minjia WANG Dandan GAO Jian WU Bo Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei 230039 China National Mobile Communications Research Laboratory Southeast University Nanjing 210096China School of Mathematical Sciences Anhui University Hefei 230601 China. School of Science Shandong University of Technology Zibo 255091 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Bcijing 100093 China

This paper firstly gives some necessary conditions on one-Gray weight linear codes. And then we use these results to construct several classes of one-Gray weight linear codes over Z_4 +uZ_4(u^2=u) with type 16^(k_1)8^(k_2)8^(k_3)4^(k_4)4^(k_5)4^(k_6)2^(k_7)2^(k_8) based on a distance-preserving Gray map from(Z4 + u Z4)n to Z2n4. Secondly, the authors use the similar approach to do works on two-Gray(projective) weight linear codes. Finally, some examples are given to illustrate the construction methods.

关键词： Generator matrix Gray map linear code one-Gray weight code two-Gray weight code

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Downlink scheduling and coordinated transmission for CRE ues with ABS in ultra-dense networks

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International Journal of Simulation: Systems, Science and Technology 2016年第4期17卷 16.1-16.6页

作者： Wang, Yi Hu, Yanjun Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China

Ultra-dense network (UDN) is a promising way to address the high throughput demand in future radio access networks. However, the downlink inter-cell interference to user equipments (UEs) in dense small cell environment is a key problem restricting the wide application. Although cell range expansion (CRE) and almost blank subframe (ABS) cancel the interference from macro cells, they cannot deal with the interference from small cells in a dense deployed network. To reduce the interference caused by high small cells density, we propose a downlink scheduling and coordinated transmission algorithm for CRE UEs. CRE UEs can be transferred to different protected subframes dynamically in time domain to avoid the main interference sources. And coordinated transmission between macro and pico eNB could help guarantee CRE UEs’ performance which are far from serving cells. Simulation results show that our proposed algorithm provides stable and substantial spectrum efficiency gains compared to traditional methods. © 2016, UK Simulation Society. All rights reserved.

关键词： Heterogeneous networks

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Design the non-fragile H controller of a category of positive systems 31

Design the non-fragile H controller of a category of positiv...

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31st Youth Academic Annual Conference of Chinese Association of Automation, YAC 2016

作者： Ren, Chengcheng Wu, Shanshan He, Shuping School of Electrical Engineering and Automation Anhui University Hefei China Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education School of Electrical Engineering and Automation Anhui University Hefei China

ISBN: (纸本)9781509044238

A non-fragile H controller design approach is studied in this paper for a class of system. The purpose is design a suitable non-fragile controller satisfied that the induced L∞ gain from disturbance signal to output signal is bounded and minimized. In order to ensure the existence of H∞ controller, the article given the sufficient conditions and proved that the condition is feasible. Simulation results are proposed to describe the validity of the designed approaches. © 2016 IEEE.

关键词： Controllers

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Fast numerical method based on compressive sensing for electromagnetic back scattering from one-dimensional rough surface with wide incidence

Fast numerical method based on compressive sensing for elect...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Y. Y. Pang A. Q. Wang T. Q. Liao Key Laboratory of Intelligent Computing & Signal Processing Anhui University Hefei China

ISBN: (纸本)9781509060948

The fast numerical method based on compressive sensing (CS) technology is introduced to calculate the electromagnetic (EM) scattering from a perfectly electrical conducting (PEC) rough surface. A new incident source with lower dimension is firstly obtained by employing the product of the measurement matrix and the voltage vector of the traditional method of moment (MOM). And then the measurements of the induced current vector are computed by solving the integral equation under the new incident source. Finally, the original induced currents on the rough surface are recovered by the Stagewise orthogonal matching Pursuit (StOMP) algorithm. Hence, the new method can greatly reduce the number of unknowns of the full MOM analysis. Good agreements between the CS and the exact results obtained by the MOM are exhibited. And the CS technology costs less time than the MOM.

关键词： Rough surfaces Surface roughness Method of moments Surface impedance Surface waves Electromagnetic scattering

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A theoretical analysis of second and third harmonic generation in metal nanospheres

A theoretical analysis of second and third harmonic generati...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Yaguang Zhang Zhixiang Huang Key Laboratory of intelligent Computing & Signal Processing Anhui University Hefei China

ISBN: (纸本)9781509060948

Using classical electrodynamics, a theoretical analysis of second and third harmonic generation (SHG and THG) by spherical metal clusters is presented. Based on the anharmonic oscillator model for the displacement of the surface charge, the sources of the radiation generated in second and third harmonic are determined by using the approximation of the second and third power of the linear surface charge. Then the higher harmonic electric fields are determined by matching the electric fields inside and outside the sphere. Angular dependence of the intensities and the degree of polarization are studied. Detailed results of the SHG and THG are presented. The particle size sensitivity of Mie-scattering is increased by nonlinearity.

关键词： Harmonic analysis Optical surface waves Power system harmonics Iron Electromagnetics Frequency conversion

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A Routing Scheme Based on Spray-and-Wait and Connecting-Capability of Node

A Routing Scheme Based on Spray-and-Wait and Connecting-Capa...

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2016 IEEE International Conference on Progress in Informatics and computing

作者： Guizhu Wang Hui Zhang Dong Pan Jian Tao Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Anhui University

DTNs overcome the problems associated with intermittent connectivity, long or variable delay, asymmetric data rates, and high error rates by using store-carry-forward message switching. In DTNs, a node is an entity with a bundle layer. A node may be a host, router, or gateway(or some combination)acting as a source, destination, or forwarder of bundles. In addition, the performance of node shows great differences. However,the previous DTN routings show blindly and randomly, which do not measure the performance of node when they forward messages. To deal with this issue, we present the concept of Node Connection Intensity(NCI) and Node Connection Stability(NCS), then propose a routing scheme based on Spray-and-Wait and Connecting-Capability of Node(SW-CCN), which evaluate relay node's forward capability synthetically according to the NCI and the NCS. The SW-CCN routing can allocate message replications dynamically and solve the problem of selecting the relay node blindly. Compared with the classical routing protocols, the simulation results show that the proposed algorithm can significantly enhance delivery rate and improve network performance.

关键词： DTNs Node Connection Intensity Node Connection Stability

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Fast numerical simulations of electromagnetic scattering from one-dimensional rough surface over a frequency band

Fast numerical simulations of electromagnetic scattering fro...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： R. Bao A. Q. Wang Z. X. Huang Key Laboratory of Intelligent Computing & Signal Processing Anhui University Hefei China

ISBN: (纸本)9781509060948

To fast calculate the backscattering coefficient from a one-dimensional rough surface over a frequency band, the asymptotic waveform evaluation (AWE) technique is introduced in this paper. The tapered plane wave is chosen as the incident wave to avoid the artificial edge diffraction due to the finite length of the simulated rough surface. The Pierson-Moskowitz (PM) spectrum ocean rough surface is applied to simulate the realistic rough surface. Good agreements between the AWE and the exact results obtained by the method of moment (MoM) are exhibited. And the AWE is more effective in computing time over a frequency band.

关键词： Rough surfaces Surface roughness Sea surface Method of moments Surface waves Backscatter Surface impedance

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A Theoretical Analysis of Quantum-corrected Model in Metal Nanowire Dimer

A Theoretical Analysis of Quantum-corrected Model in Metal N...

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Progress in Electromagnetic Research Symposium

作者： Kaikun Niu Bo Wu Zhixiang Huang Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University

ISBN: (纸本)9781509060948

Using a quantum-corrected model, the optical cross section of a strongly coupled metallic nanowire dimer for variable separation widths of the junction between the nanowires is analysed by finite-different time-domain method. Numerical results show the classical electrodynamics fails to describe the coupling across sub-nanometer gaps, owing to non-local screening and the spill-out of electrons, where quantum effects become important. The quantum-corrected model approach models the junction between adjacent nanoparticles by means of a local dielectric response that includes electron tunnelling and tunnelling resistivity at the gap. The quantum-corrected model predicts optical properties in excellent agreement with fully quantum mechanical calculations for small interacting systems, opening a new venue for addressing quantum effects in realistic plasmonic systems.

关键词： Tunneling Electromagnetics Plasmons Electromagnetic scattering Nanoparticles Conductivity

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Compact 30:1 Bandwidth ratio balun for printed balanced antennas

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Progress In Electromagnetics Research C 2016年 64卷 125-132页

作者： Meng, Xueqing Wu, Bo Huang, Zhi-Xiang Wu, Xian-Liang The Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Anhui University Hefei230039 China

A new compact 30 : 1 bandwidth ratio balun and its application to balanced antennas are presented in this paper. To realize the balun-type function, two different types of wideband transition structures are adopted for unbalanced and balanced outputs of the balun. Further, a Vivaldi antenna integrated with the proposed balun is designed and fabricated to validate the feasibility of the new approach. Results indicated that the proposed balun can operate from 0.2GHz to 6GHz (a bandwidth ratio of 30 : 1). And it exhibits a good balanced performance within 0.5 dB magnitude imbalance and less than 6 degree phase imbalance between the two balanced outputs. In addition, the antenna can operate from 0.9GHz to 6GHz with good unidirectional radiation patterns. © 2016, Electromagnetics Academy. All rights reserved.

关键词： Bandwidth

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