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Electrical and Computer Engineering Faculty Research & Creative Works

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Articles 1381 - 1410 of 3518

Full-Text Articles in Engineering

The Fokker-Planck Equation For Power System Stability Probability Density Function Evolution, Keyou Wang, Mariesa L. Crow Jan 2013

The Fokker-Planck Equation For Power System Stability Probability Density Function Evolution, Keyou Wang, Mariesa L. Crow

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents an analysis of the evolution of the probability density function of the dynamic trajectories of a single machine infinite bus power system. The probability density function can be used to determine the impact of random (stochastic) load perturbations on system stability. The evolution of the state probability density function over time leads to several interesting observations regarding stability regions as a function of damping parameter. The Fokker-Planck equation (FPE) is used to describe the evolution of the probability density of the states. The FPE is solved numerically using PDE solvers (such as finite difference method). Based on …

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Source Reconstruction Method-Based Radiated Emission Characterization For Pcbs, Ping Li, Li Jun Jiang Jan 2013

Source Reconstruction Method-Based Radiated Emission Characterization For Pcbs, Ping Li, Li Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A technique based on a source reconstruction method (SRM) is employed to reproduce the same electromagnetic radiated emissions from printed circuit boards (PCB). This equivalent source is composed of both the electric and magnetic currents that are represented by a set of Rao-Wilton-Glisson basis functions. Planar magnetic near field is served as the input information for the SRM. The equivalent source is inversely acquired through the conjugate gradient algorithm that minimizes the norm of the residue. Magnetic field integral equation is utilized to find out the unknown coefficients of the currents. This method is directly extended to model the emissions …

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Improved Target Impedance For Power Distribution Network Design With Power Traces Based On Rigorous Transient Analysis In A Handheld Device, Jingook Kim, Yuzo Takita, Kenji Araki, Jun Fan Jan 2013

Improved Target Impedance For Power Distribution Network Design With Power Traces Based On Rigorous Transient Analysis In A Handheld Device, Jingook Kim, Yuzo Takita, Kenji Araki, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

The concept of target impedance can be significantly improved, based on the rigorous closed-form expressions for transient supply voltage ripple excited by an integrated circuit (IC) switching current, for the power distribution network (PDN) with power traces that is commonly used in handheld devices. A systematic procedure for developing the target impedance is formulated, which is then applied to the PDN design of a handheld product. From measurements of transient IC switching currents, PDN impedance, and supply voltage ripple, it is shown that the proposed target impedance successfully correlates the PDN impedance in the frequency domain with the transient supply …

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Accurate 3-D Capacitance Of Parallel Plates From 2-D Analytical Superposition, Richard E. Matick, Albert E. Ruehli Jan 2013

Accurate 3-D Capacitance Of Parallel Plates From 2-D Analytical Superposition, Richard E. Matick, Albert E. Ruehli

Electrical and Computer Engineering Faculty Research & Creative Works

The two-conductor strip line is a classic transmission line structure which has been extensively studied and used in endless applications for decades. Unfortunately, the exact determination of the 3-D capacitance of this basic case is analytically intractable. It will be shown that accurate values of the total 3-D capacitance of a parallel plate capacitor with thin plates of any length, width, and separation can be determined from the superposition of the exact 2-D capacitance obtained from an analytic solution using elliptic integrals in a very simple manner. The accuracy is determined for a range of cases through a comparison of …

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Fpga Implementation Of Qr Decomposition For Mimo-Ofdm Using Four Cordic Cores, Bing Han, Zengli Yang, Yahong Rosa Zheng Jan 2013

Fpga Implementation Of Qr Decomposition For Mimo-Ofdm Using Four Cordic Cores, Bing Han, Zengli Yang, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

A low-resource implementation of QR decomposition (QRD) is proposed for MIMO-OFDM systems that employ turbo MMSE-IC (Minimum mean square error interference cancellation) detector. The proposed implementation uses only four CORDIC cores for QR decomposition of complex-valued matrices while existing systolic array architecture requires 15 to 38 CORDIC cores to achieve similar throughput. For 4-by-4 MIMO with 1024 subcarrier OFDM, the turbo MMSE-IC requires 1024 QRD of 4-by-4 complex matrices followed by back substitution. Each matrix QRD is accompanied by rotations of four vectors for the second and subsequent turbo iterations. The proposed architecture implements the multiple vector rotation by multipliers …

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How Many Antennas Does A Cooperative Jammer Need For Achieving The Degrees Of Freedom Of Multiple Antenna Gaussian Channels In The Presence Of An Eavesdropper?, Mohamed Nafea, Aylin Yener Jan 2013

How Many Antennas Does A Cooperative Jammer Need For Achieving The Degrees Of Freedom Of Multiple Antenna Gaussian Channels In The Presence Of An Eavesdropper?, Mohamed Nafea, Aylin Yener

Electrical and Computer Engineering Faculty Research & Creative Works

In this work, multiple antenna Gaussian wiretap channels with a multiantenna cooperative jammer are considered. In particular, the focus is on identifying the spatial resources needed at the cooperative jammer in order to achieve a secure degree of freedom (s.d.o.f.) for the channel in question equal to the degrees of freedom (d.o.f.). In order to accomplish this goal, the cooperative jammer sets out to send correlated jamming signals. Simultaneously, the legitimate transmitter chooses a precoder that perfectly aligns its information signals over the jamming ones at the eavesdropper. Both terminals use structured signaling, i.e., discrete constellations. The proposed approach is …

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Large-Scale Electromagnetic Computation For Modeling And Applications, Qing Huo Liu, Lijun Jiang, Weng Cho Chew Jan 2013

Large-Scale Electromagnetic Computation For Modeling And Applications, Qing Huo Liu, Lijun Jiang, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

The papers in this special issue are devoted to the topic of large-scale electromagnetic computation methods for modeling and applicatoins. © 1963-2012 IEEE.

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Enhanced-Resolution Folded C-Section Phaser, S. Gupta, Lijun Jiang, C. Caloz Jan 2013

Enhanced-Resolution Folded C-Section Phaser, S. Gupta, Lijun Jiang, C. Caloz

Electrical and Computer Engineering Faculty Research & Creative Works

A new C-section phasers based on folded coupled-line couplers has been proposed for high-resolution analog signal processing (ASP). The folded configuration of the coupled-line coupler provides a tight coupling in a planar configuration between the input and the coupled port, using sections of relatively small coupling values. It subsequently provides a larger group delay swing in the corresponding C-section phaser required for enhanced resolution ASP. The proposed phaser is demonstrated using full-wave simulations. © 2013 IEEE.

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Pulsed Line Source Response Of A Thin Sheet With High-Contrast Dielectric And Conductive Properties - A Time-Domain Analysis, Adrianus T. De Hoop, Ling Ling Meng, Li (Lijun) Jun Jiang Jan 2013

Pulsed Line Source Response Of A Thin Sheet With High-Contrast Dielectric And Conductive Properties - A Time-Domain Analysis, Adrianus T. De Hoop, Ling Ling Meng, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A methodology is presented for analytically modeling the reflection and transmission of line-source excited pulsed electromagnetic fields at a thin, planar layer with high-contrast dielectric and conductive properties. Closed-form analytic time-domain expressions are derived for the field components in a 2-D setting via an extension of the Cagniard-DeHoop method. The response to the power exponential source and the power exponential monocycle pulse were studied using the newly proposed method. © 2013 IEEE.

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A New Efie Method Based On Coulomb Gauge For The Low-Frequency Electromagnetic Analysis, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Wei E.I. Sha, Yat Hei Lo Jan 2013

A New Efie Method Based On Coulomb Gauge For The Low-Frequency Electromagnetic Analysis, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Wei E.I. Sha, Yat Hei Lo

Electrical and Computer Engineering Faculty Research & Creative Works

To solve the low-frequency breakdown inherent from the electric field integral equation (EFIE), an alternative new form of the EFIE is proposed by using the Coulomb-gauge Green's function of quasi-static approximation. Di®erent from the commonly adopted Lorentz-gauge EFIE, the Coulomb-gauge EFIE separates the solenoidal and irrotational surface currents explicitly, which captures inductive and capacitive responses through electrodynamic and electrostatic Green's functions, respectively. By applying existing techniques such as the loop-tree decomposition, frequency normalization, and basis rearrangement, the Coulomb-gauge EFIE also can remedy the low-frequency breakdown problem. Through comparative studies between the Lorentz-gauge and Coulomb-gauge EFIE approaches from mathematical, physical and …

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Overview Of Large-Scale Computing: The Past, The Present, And The Future, Weng Cho Chew, Li (Lijun) Jun Jiang Jan 2013

Overview Of Large-Scale Computing: The Past, The Present, And The Future, Weng Cho Chew, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

This is a brief review of the development of computational electromagnetics (CEM) to partially summarize its achievements, issues, and possibilities. © 1963-2012 IEEE.

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Finite-Width Feed And Load Models, Yat Hei Lo, Li (Lijun) Jun Jiang, Weng Cho Chew Jan 2013

Finite-Width Feed And Load Models, Yat Hei Lo, Li (Lijun) Jun Jiang, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

We demonstrate a new method of applying the feed model for the method of moments (MoM) formulation for the electric field integral equation (EFIE). The model is based around a previously reported magnetic ribbon current model which is accurate and allows for a finite width of the feed port. However, with proper approximations, one can reduce the formulation such that the magnetic field operator can be removed in order to simplify computations arising from the curl of the dyadic Green's function and its singularities. We show here that the new feed model can also be used to model a lumped …

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A New Variable Step-Size Zero-Point Attracting Projection Algorithm, Jianming Liu, Steven L. Grant Jan 2013

A New Variable Step-Size Zero-Point Attracting Projection Algorithm, Jianming Liu, Steven L. Grant

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes a new variable step-size (VSS) scheme for the recently introduced zero-point attracting projection (ZAP) algorithm. The proposed variable step-size ZAPs are based on the gradient of the estimated filter coefficients' sparseness that is approximated by the difference between the sparseness measure of current filter coefficients and an averaged sparseness measure. Simulation results demonstrate that the proposed approach provides both faster convergence rate and better tracking ability than previous ones. © 2013 IEEE.

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Low Complexity Soft-Interference Cancellation Turbo Equalization For Mimo Systems With Multilevel Modulations, Jingxian Wu, Longbao Wang, Chengshan Xiao Jan 2013

Low Complexity Soft-Interference Cancellation Turbo Equalization For Mimo Systems With Multilevel Modulations, Jingxian Wu, Longbao Wang, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a low complexity soft-interference cancellation equalizer (SICE) for the turbo detection of multiple-input multiple-output (MIMO) systems operating in time dispersive channels. The SICE contains three time-invariant linear filters: a feedforward filter, a causal feedback filter and an anti-causal feedback filter. The feedforward filter is designed to suppress the InterSymbol interference (ISI) due to time dispersive channels and the multiplexing interference from multiple transmit antennas. The causal (or anti-causal) feedback filter is developed to remove the residual interference caused by the symbols transmitted before (or after) the symbol under detection. The performance of the proposed SICE is verified …

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Energy And Spectral Efficient Transmissions Of Coded Arq Systems, Jingxian Wu, Gang Wang, Yahong Rosa Zheng Jan 2013

Energy And Spectral Efficient Transmissions Of Coded Arq Systems, Jingxian Wu, Gang Wang, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

Energy efficiency (EE) and spectral efficiency (SE) feature one of the most fundamental tradeoffs in communication systems. In this paper, we propose an optimum transmission scheme for coded Type-I automatic repeat request (ARQ) systems to balance the EE-SE tradeoff. The optimization is performed with respect to a new design metric, the normalized EE (NEE), which is defined as the energy per bit normalized by the SE. Minimizing NEE means either reducing the energy per bit or increasing the SE, it thus yields a balanced tradeoff between the two. The system design incorporates a wide range of practical system parameters, such …

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Neural Network-Based Optimal Control Of Mobile Robot Formations With Reduced Information Exchange, Travis Dierks, Bryan Brenner, S. Jagannathan Jan 2013

Neural Network-Based Optimal Control Of Mobile Robot Formations With Reduced Information Exchange, Travis Dierks, Bryan Brenner, S. Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

A novel formation control scheme for mobile robots is introduced in the context of leader-follower framework with reduced communication exchange. The dynamical controller inputs for the robots are approximated from nonlinear optimal control techniques in order to track the designed control velocities generated by the kinematic controller. The proposed nonlinear optimal control technique, referred to as adaptive dynamic programming, uses neural networks (NNs) to solve the optimal formation control problem in discrete time in the presence of unknown internal dynamics and a known control coefficient matrix. A modification to the follower's kinematic controller is used to allow the desired formation …

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Harmonic Distortion Optimization Of Cascaded H-Bridge Inverters Considering Device Voltage Drops And Noninteger Dc Voltage Ratios, Bill Diong, Hossein Sepahvand, Keith Corzine Jan 2013

Harmonic Distortion Optimization Of Cascaded H-Bridge Inverters Considering Device Voltage Drops And Noninteger Dc Voltage Ratios, Bill Diong, Hossein Sepahvand, Keith Corzine

Electrical and Computer Engineering Faculty Research & Creative Works

This paper considers achieving the minimum total harmonic distortion (THD) or frequency-weighted THD (WTHD) of the staircase-modulated output voltage of single-phase multilevel inverters, with or without elimination of the lowest order harmonics. The minimal THD values, together with the corresponding step angles and dc voltage source ratios, have been obtained for the 5-, 7-, 9-, 11-, and 13-level cases; accounting for the device voltage drops when the load is resistive or is moderately inductive is described. Similarly, the minimal WTHD values, together with the corresponding step angles and dc source voltage ratios, have been obtained for the five-, seven-, and …

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Integration Of Arbitrary Lumped Multiport Circuit Networks Into The Discontinuous Galerkin Time-Domain Analysis, Ping Li, Li Jun Jiang Jan 2013

Integration Of Arbitrary Lumped Multiport Circuit Networks Into The Discontinuous Galerkin Time-Domain Analysis, Ping Li, Li Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A hybrid electromagnetic (EM) circuit simulator is proposed for incorporating multiport lumped circuit networks through their admittance matrices into the discontinuous Galerkin time-domain (DGTD) method. The admittance matrix in the Laplace domain can be derived analytically or obtained from network parameters such as -parameters in the frequency domain. To convert frequency-dependent -parameters into the admittance matrix in the Laplace domain, the vector-fitting technique is employed to facilitate the mapping process. The computational domain of interest is split into two subdomains. One is the EM part solved by the DGTD, and another is the circuit part modeled by the basic I-V …

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The Numerical Steepest Descent Path Method For Calculating Physical Optics Integrals On Smooth Conducting Quadratic Surfaces, Yu Mao Wu, Li (Lijun) Jun Jiang, Wei E.I. Sha, Weng Cho Chew Jan 2013

The Numerical Steepest Descent Path Method For Calculating Physical Optics Integrals On Smooth Conducting Quadratic Surfaces, Yu Mao Wu, Li (Lijun) Jun Jiang, Wei E.I. Sha, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, we use the numerical steepest descent path (NSDP) method to analyze the highly oscillatory physical optics (PO) integral on smooth conducting parabolic surfaces, including both monostatic and bistatic cases. Quadratic variations of the amplitude and phase functions are used to approximate the integrand of PO integral. Then the surface PO integral is reduced into several highly oscillatory line integrals. By invoking the NSDP method, these highly oscillatory PO line integrals are defined on the corresponding NSDPs. Furthermore, the critical point contributions for the PO integral are exactly extracted and represented based on the NSDPs. The proposed NSDP …

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Magneto-Electric Dipole Antenna Based On Differentially-Excited Composite Right/Left-Handed (Crlh) Transmission Lines, S. Gupta, Lijun Jiang, C. Caloz Jan 2013

Magneto-Electric Dipole Antenna Based On Differentially-Excited Composite Right/Left-Handed (Crlh) Transmission Lines, S. Gupta, Lijun Jiang, C. Caloz

Electrical and Computer Engineering Faculty Research & Creative Works

A new magneto-electric (ME) dipole antenna array is proposed which provides a combined electric- and magnetic-dipole response in a planar configuration. The proposed structure is based on Composite Right/Left-Handed (CRLH) transmission lines, which is differentially fed and operated in the zeroth-order regime to provide maximal gain for the combined radiators. The basic principle of the proposed ME-dipole antenna is discussed and demonstrated with full-wave simulation results. © 2013 IEEE.

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Skin-Effect Loss Models For Time- And Frequency-Domain Peec Solver, Albert E. Ruehli, Giulio Antonini, Li (Lijun) Jun Jiang Jan 2013

Skin-Effect Loss Models For Time- And Frequency-Domain Peec Solver, Albert E. Ruehli, Giulio Antonini, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A challenging and interesting issue for the solution of large electromagnetic problems is the efficient, sufficiently accurate modeling of the broadband skin-effect loss for conducting planes and 3-D shapes. The inclusion of such models in an electromagnetic (EM) solver can be very costly in compute time and memory requirements. These issues are particularly important for the class of signal, power, and noise integrity (NI) problems. In this paper, we concentrate on partial element equivalent circuit (PEEC)-type methods which are suitable for the solution of this class of problems. Progress has been made recently in the design of skin-effect models. The …

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An Iterative Source Reconstruction Method Exploiting Phaseless Electric Field Data, Ping Li, Lijun Jiang Jan 2013

An Iterative Source Reconstruction Method Exploiting Phaseless Electric Field Data, Ping Li, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Conventional equivalent source reconstruction methods (SRM) require both phase and amplitude information of the acquired field data. However, there are situations where the phase information is not available or impractical to obtain. Hence, the development of SRM using phaseless fields is important. In this paper, a novel iterative SRM based on phaseless electric fields is presented. The reconstructed equivalent current source can be electric, magnetic current, or both. They can fit the physical geometry of the radiator. Electric field integral equation (EFIE) is employed to build the relationship between the reconstructed current source and measured fields. It can precisely reproduce …

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A Systematic Electromagnetic-Circuit Method For Emi Analysis Of Coupled Interconnects On Dispersive Dielectrics, Min Tang, Jiaqing Lu, Junfa Mao, Lijun Jiang Jan 2013

A Systematic Electromagnetic-Circuit Method For Emi Analysis Of Coupled Interconnects On Dispersive Dielectrics, Min Tang, Jiaqing Lu, Junfa Mao, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a systematic electromagnetic-circuit method for efficient simulation of coupled interconnects on dispersive dielectrics in the presence of electromagnetic interference. The dispersive substrate of coupled interconnects is characterized by the multiterm Debye or Lorentz formula. According to the differential equations derived from the equivalent circuit modeling of dispersive media, the full-wave finite-difference time-domain algorithm is utilized to capture accurate field in a dispersive substrate. The effects of incident field, under the quasi-TEM assumption, are then represented by the distributed sources along transmission lines. An efficient algorithm based on the waveform relaxation with transverse partitioning (WR-TP) is employed for …

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Reflection-Based Phase-Shifted Long Period Fiber Grating For Simultaneous Measurement Of Temperature And Refractive Index, Jie Huang, Xinwei Lan, Amardeep Kaur, Haining Wang, Lei Yuan, Hai Xiao Jan 2013

Reflection-Based Phase-Shifted Long Period Fiber Grating For Simultaneous Measurement Of Temperature And Refractive Index, Jie Huang, Xinwei Lan, Amardeep Kaur, Haining Wang, Lei Yuan, Hai Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

We report a reflection-based phase-shifted long period fiber grating (PS-LPFG) and demonstrate its capability for simultaneous measurement of temperature and external reflective index (RI). The sensor device comprises a grating directly written by CO2 laser and silver-coated end face. A π-shifted LPFG is presented with two attenuation bands through its reflection spectrum. These two bands have different sensitivity towards temperature and external RI that can be used for simultaneous measurement of the two variables. The experimental results show that this probe-type PS-LPFG performs well in terms of linearity and sensitivity.

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Tests For Time Domain Em Solvers For Stability And Towards Passivity, G. Antonini, Albert E. Ruehli, D. Romano, L. (Lijun) Jiang Jan 2013

Tests For Time Domain Em Solvers For Stability And Towards Passivity, G. Antonini, Albert E. Ruehli, D. Romano, L. (Lijun) Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Stability issues for time domain integral equation based EM solvers have been a problem for a many years. In this paper, we consider ways to test for stability as well as other criteria towards passivity. The tests are designed to monitor the EM solver while the time domain solution is progressing. Hence, the solution can be terminated and improved with a passivization technique when a violation of the criterion has been detected. Also, the tests help to understand the cause of instabilities and results can be used for passivization. © 2013 IEEE.

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Adaptive Multi-Vehicle Area Coverage Optimization System And Method, Ryan J. Meuth, John Lyle Vian, Emad W. Saad, Donald C. Wunsch Jan 2013

Adaptive Multi-Vehicle Area Coverage Optimization System And Method, Ryan J. Meuth, John Lyle Vian, Emad W. Saad, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

A mission planning system for determining an optimum use of a plurality of vehicles in searching a predefined geographic area (PGA). A discretizer subsystem may be used for sensing the capabilities of each vehicle to produce a point set defining a number of points within the PGA that the vehicles must traverse to completely search the PGA. A task allocator subsystem may determine an optimum division of the PGA into different subregions to be handled by specific ones of the vehicles, thus to minimize an overall time needed to search the PGA. A path optimizer subsystem may determine an optimum …

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No-Boundary Thinking In Bioinformatics Research, Xiuzhen Huang, Barry Bruce, Alison Buchan, Clare Bates Congdon, Carole L. Cramer, Steven F. Jennings, Hongmei Jiang, Zenglu Li, Gail Mcclure, Rick Mcmullen, Jason H. Moore, Bindu Nanduri, Joan Peckham, Andy Perkins, Shawn W. Polson, Bhanu Rekepalli, Saeed Salem, Jennifer Specker, Donald C. Wunsch, Donghai Xiong, Shuzhong Zhang, Zhongming Zhao Jan 2013

No-Boundary Thinking In Bioinformatics Research, Xiuzhen Huang, Barry Bruce, Alison Buchan, Clare Bates Congdon, Carole L. Cramer, Steven F. Jennings, Hongmei Jiang, Zenglu Li, Gail Mcclure, Rick Mcmullen, Jason H. Moore, Bindu Nanduri, Joan Peckham, Andy Perkins, Shawn W. Polson, Bhanu Rekepalli, Saeed Salem, Jennifer Specker, Donald C. Wunsch, Donghai Xiong, Shuzhong Zhang, Zhongming Zhao

Electrical and Computer Engineering Faculty Research & Creative Works

Currently there are definitions from many agencies and research societies defining "bioinformatics" as deriving knowledge from computational analysis of large volumes of biological and biomedical data. Should this be the bioinformatics research focus? We will discuss this issue in this review article. We would like to promote the idea of supporting human-infrastructure (HI) with no-boundary thinking (NT) in bioinformatics (HINT).

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A Wide-Band Equivalent Source Reconstruction Method Exploiting The Stoer-Bulirsch Algorithm With The Adaptive Frequency Sampling, P. Li, Y. Li, Lijun Jiang, J. Hu Jan 2013

A Wide-Band Equivalent Source Reconstruction Method Exploiting The Stoer-Bulirsch Algorithm With The Adaptive Frequency Sampling, P. Li, Y. Li, Lijun Jiang, J. Hu

Electrical and Computer Engineering Faculty Research & Creative Works

Conventional equivalent source reconstruction methods are only operating at a single frequency point each time. However, for wide-band radiators, their computation cost of the source reconstruction increases with the number of frequency points. In this communication, a wide-band equivalent source reconstruction method (WB-SRM) based on the Neville-type Stoer-Bulirsch (SB) algorithm is developed. Since the SB algorithm is a recursive tabular method, it can perform the interpolation over a broadband using a single rational function without any singularity issue. Supported by the adaptive frequency sampling (AFS) scheme, the number of required sampling data is significantly reduced, which leads to much better …

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Resilience Experiments On The Gpeni Testbed, Egemen K. Çetinkaya, Dongsheng Zhang, Mohammed J. F. Alenazi, Yufei Cheng, Parker Riley, James P. G. Sterbenz Jan 2013

Resilience Experiments On The Gpeni Testbed, Egemen K. Çetinkaya, Dongsheng Zhang, Mohammed J. F. Alenazi, Yufei Cheng, Parker Riley, James P. G. Sterbenz

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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An Improved Dipole-Moment Model Based On Near-Field Scanning For Characterizing Near-Field Coupling And Far-Field Radiation From An Ic, Zhenwei Yu, Jason A. Mix, Soji Sajuyigbe, Kevin P. Slattery, Jun Fan Jan 2013

An Improved Dipole-Moment Model Based On Near-Field Scanning For Characterizing Near-Field Coupling And Far-Field Radiation From An Ic, Zhenwei Yu, Jason A. Mix, Soji Sajuyigbe, Kevin P. Slattery, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, an improved dipole-moment model for characterizing near-field coupling and far-field radiation from an IC based on near-field scanning is proposed. An array of electric and magnetic dipole moments is used to reproduce the field distributions in a scanning plane above an IC. These dipole moments can then be used as noise sources for the IC. In order to ensure the accurate prediction of the near-field coupling from the IC, the regularization technique and the truncated singular-value decomposition method are investigated in this paper, together with the conventional least-squares method, to reconstruct the dipole moments from the near-field …

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