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A Free Deterministic Equivalent For The Capacity Of Mimo Mac With Distributed Antenna Sets, An An Lu, Xiqi Gao, Chengshan Xiao
A Free Deterministic Equivalent For The Capacity Of Mimo Mac With Distributed Antenna Sets, An An Lu, Xiqi Gao, Chengshan Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we propose a free deterministic equivalent for the capacity analysis of multi-input multi-output (MIMO) multiple access channel (MAC) with distributed antenna sets. In the analysis, we use the operator-valued free probability framework, which is much more straightforward than the widely used methods, i.e., the Bai and Silverstein method and the Gaussian method. By replacing independent random Gaussian variables with freely independent circular entries, we obtain the free deterministic equivalent of our channel model. To evaluate the capacity, we use the Shannon transform of the free deterministic equivalent to approximate that of the channel model. The free deterministic …
An Optimized Nlms Algorithm For Acoustic Echo Cancellation, Silviu Ciochina, Constantin Paleologu, Jacob Benesty, Steven L. Grant
An Optimized Nlms Algorithm For Acoustic Echo Cancellation, Silviu Ciochina, Constantin Paleologu, Jacob Benesty, Steven L. Grant
Electrical and Computer Engineering Faculty Research & Creative Works
In order to improve the overall performance of the normalized least-mean-square (NLMS) algorithm, there is the need to control its main parameters, i.e., the normalized step-size and regularization terms. In this context, the variable step-size and variable regularized versions of the NLMS algorithm are designed to address the conflicting requirement of fast convergence and low mis adjustment. In this paper, we propose an optimized NLMS algorithm for acoustic echo cancellation (AEC). This algorithm is based on a joint-optimization on both the normalized step-size and regularization parameters, in the context of a state variable model (similar to Kalman filtering). The simulation …
4h-Sic Electrostatic Cantilever Actuator Released By Photoelectrochemical Etching And Application For Frequency Mixing, F. Zhao, A. Lim, Q. Tran, C. F. Huang
4h-Sic Electrostatic Cantilever Actuator Released By Photoelectrochemical Etching And Application For Frequency Mixing, F. Zhao, A. Lim, Q. Tran, C. F. Huang
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reports an electrostatically actuated single crystal 4H-SiC cantilever performing frequency mixing. In order to achieve electrostatic actuation and solve the challenge of releasing MEMS structures due to the extreme chemical hardness of 4H-SiC, an n-p-n homoepitaxial structure was chosen, with cantilever actuators released by photoelectrochemical (PEC) etching. The middle p-SiC layer acts as a sacrificial layer in PEC etching to release actuators and also isolates the top n-SiC cantilever from the bottom n-SiC substrate to realize electrostatic actuation. This study shows that electrostatically actuated RF MEMS capable of operating in harsh environments are attainable by single crystal 4H-SiC …
An Improved Variable Step-Size Zero-Point Attracting Projection Algorithm, Jianming Liu, Steven L. Grant
An Improved Variable Step-Size Zero-Point Attracting Projection Algorithm, Jianming Liu, Steven L. Grant
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes an improved variable step-size (VSS) scheme for zero-point attracting projection (ZAP) algorithm. The proposed VSS is proportional to the sparseness difference between filter coefficients and the true impulse response. Meanwhile, it works for both sparse and non-sparse system identification, and simulation results demonstrate that the proposed algorithm could provide both faster convergence rate and better tracking ability than previous ones.
The Fast Contour Deformation Method For Calculating The High Frequency Scattered Field From The Fock Current On The Convex Scatterer, Yu Mao Wu, Weng Cho Chew, Li (Lijun) Jun Jiang
The Fast Contour Deformation Method For Calculating The High Frequency Scattered Field From The Fock Current On The Convex Scatterer, Yu Mao Wu, Weng Cho Chew, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, the Fock current from the 3-D convex cylinder is considered. By using the incremental length diffraction coefficient technique (ILDC), the resultant high frequency scattered fields are expressed in terms of the Fock current from convex scatterer. To efficiently solve the scattered fields, we propose the efficient NSDP method. Numerical examples from the convex cylinder scatterer illustrate that the proposed NSDP method for calculating the high frequency scattered fields could achieve the frequency independent computational workload and error controllable accuracy.
Fast Data Pattern Based Electromagnetic Interference Evaluation For Ic Packaging, Nick K.H. Huang, Li (Lijun) Jun Jiang
Fast Data Pattern Based Electromagnetic Interference Evaluation For Ic Packaging, Nick K.H. Huang, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Electromagnetic interference (EMI) is becoming more serious when the data rate of the digital system continues increasing. However, its modeling and analysis are very challenging. In this paper, a novel electromagnetic superposition method is developed to model the IC packaging electromagnetic emission. It employs the equivalence principle to obtain the electromagnetic field response over a broad spectrum. Then it uses the linear property of the passive parasitic system to superpose the contribution of different signals on the packaging. As a result, with certain pre-calculations, it is convenient to compute the electromagnetic emission efficiently from different signals with various data pattern …
Distributive Radiation And Transfer Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli
Distributive Radiation And Transfer Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
Power radiation and radiated coupling among different structures represent an important area for research study. The partial element equivalent circuit method (PEEC) is a powerful technique which bridges the gap between the electromagnetic and circuit theories. In this paper, we develop a new approach for PEEC to calculate the distributive power radiation and couplings. With this approach, formulations for both the radiated power and the transferred power can be evaluated. Further, the physical meanings of the power results are interpreted according to the conservation of energy law. We use electric dipoles, magnetic dipoles and patch antennas as well as coupled …
Uncertainty Quantification For Electromagnetic Systems Using Asgc And Dgtd Method, Ping Li, Li (Lijun) Jun Jiang
Uncertainty Quantification For Electromagnetic Systems Using Asgc And Dgtd Method, Ping Li, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, an adaptive hierarchical sparse grid collocation (ASGC) method combined with the discontinuous Galerkin time-domain method is leveraged to quantify the impacts of random parameters on the electromagnetics systems. The ASGC method approximates the stochastic observables of interest using interpolation functions over a set of collocation points determined by the Smolyak's algorithm integrated with an adaptive strategy. Instead of resorting to a full-tensor product sense, the Smolyak's algorithm constructs the collocation points in a hierarchical scheme with the interpolation level. Enhanced by an adaptive strategy, the Smolyak's algorithm will sample more points along important dimensions with sharp variations …
Method Of Effective Roughness Dielectric In A Pcb: Measurement And Full-Wave Simulation Verification, Marina Koledintseva, Tracey Vincent, Antonio Ciccomancini Scogna, Scott Hinaga
Method Of Effective Roughness Dielectric In A Pcb: Measurement And Full-Wave Simulation Verification, Marina Koledintseva, Tracey Vincent, Antonio Ciccomancini Scogna, Scott Hinaga
Electrical and Computer Engineering Faculty Research & Creative Works
Surface roughness topography of printed circuit boards (PCBs) needs to be included in signal integrity simulations in order to accurately predict the insertion loss of the structure and its delay time. An effective roughness dielectric (ERD) model can be used to substitute an inhomogeneous interface between copper foil and laminate dielectric in a PCB. Herein, this approach is tested for verification using 3-D full-wave numerical simulations. These ERD layers with the appropriate complex permittivity are included in the modeling of strip line examples. The parameters of an ambient laminate dielectric refined from conductor roughness in the strip line are determined …
Passive Equalizer And High-Speed Digital Signal Transmission System Using The Same, Eak Hwan Song, Young Kun Kwon, Won Seob Kim, Hark Byeong Park, Hyun Sik Yun, Eun Seok Hong, Chulsoon Hwang
Passive Equalizer And High-Speed Digital Signal Transmission System Using The Same, Eak Hwan Song, Young Kun Kwon, Won Seob Kim, Hark Byeong Park, Hyun Sik Yun, Eun Seok Hong, Chulsoon Hwang
Electrical and Computer Engineering Faculty Research & Creative Works
Disclosed herein are a passive equalizer and a high-speed digital signal transmission system, including first and second impedances connected in series to a first transfer line, third and fourth impedances connected in series to a second transfer line, a first inductor connected in parallel between the first impedance and the second impedance, a second inductor connected in parallel between the third impedance and the fourth impedance, and a resistor connected in series between the first inductor and the second inductor.
Transmission-Line Equivalent And Microstrip Structure For Planar Möbius Loop Resonator, Kirti Dhwaj, Hanseuyng Lee, Lijun Jiang, Tatsuo Itoh
Transmission-Line Equivalent And Microstrip Structure For Planar Möbius Loop Resonator, Kirti Dhwaj, Hanseuyng Lee, Lijun Jiang, Tatsuo Itoh
Electrical and Computer Engineering Faculty Research & Creative Works
A transmission line model for planar Möbius loop resonator is presented. Theoretical background for the Möbius loop is developed by treating it as a ring resonator. Even-Odd mode analysis is used to account for the dual mode nature of the resonator. Also, the presence of two transmission zeroes is explained using the proposed model. The transmission line model is then used to implement a simple microstrip version of the Möbius loop resonator. A single resonator is then used to implement a dual-mode bandpass filter. Simulation and test results of the structure are presented.
Impact Assessment Of Net Metering On Smart Home Cyberattack Detection, Yang Liu, Shiyan Hu, Jie Wu, Yiyu Shi, Yier Jin
Impact Assessment Of Net Metering On Smart Home Cyberattack Detection, Yang Liu, Shiyan Hu, Jie Wu, Yiyu Shi, Yier Jin
Electrical and Computer Engineering Faculty Research & Creative Works
Despite the increasing popularity of the smart home concept, such a technology is vulnerable to various security threats such as pricing cyberattacks. There are some technical advances in developing detection and defense frameworks against those pricing cyberattacks. However, none of them considers the impact of net metering, which allows the customers to sell the excessively generated renewable energy back to the grid. At a superficial glance, net metering seems to be irrelevant to the cybersecurity, while this paper demonstrates that its implication is actually profound. In this paper, we propose to analyze the impact of the net metering technology on …
A Resistive Boundary Condition Enhanced Dgtd Scheme For The Transient Analysis Of Graphene, Ping Li, Li (Lijun) Jun Jiang, Hakan Baʇci
A Resistive Boundary Condition Enhanced Dgtd Scheme For The Transient Analysis Of Graphene, Ping Li, Li (Lijun) Jun Jiang, Hakan Baʇci
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, the electromagnetic (EM) features of graphene are characterized by a discontinuous Galerkin time-domain (DGTD) algorithm with a resistive boundary condition (RBC). The atomically thick graphene is equivalently modeled using an RBC by regarding the graphene as an infinitesimally thin conductive sheet. To incorporate RBC into the DGTD analysis, the surface conductivity of the graphene composed of contributions from both intraband and interband terms is first approximated by rational basis functions using the fast-relaxation vector-fitting (FRVF) method in the Laplace domain. Next, through the inverse Laplace transform, the corresponding time-domain matrix equations in integral can be obtained. Finally, …
Efficient Location Identification Of Multiple Line Outages With Limited Pmus In Smart Grids, Jie Wu, Jinjun Xiong, Yiyu Shi
Efficient Location Identification Of Multiple Line Outages With Limited Pmus In Smart Grids, Jie Wu, Jinjun Xiong, Yiyu Shi
Electrical and Computer Engineering Faculty Research & Creative Works
The efficient location identification of multiple line outages is critical to not only cascading failure elimination but also repair cost reduction. Most of existing methods, however, fail to handle location identification well. This failure typically occurs because the methods cannot overcome two challenges: the very limited number of phasor measurement units (PMUs) and the high computational complexity. This paper presents an efficient algorithm inspired by the ambiguity group theory to identify the locations of line outages with limited PMUs. Using 14-, 57-, 118-, 300-, and 2383-bus systems, our experimental study demonstrates that the proposed technique successfully identifies the most likely …
On The Efficacy Of Through-Silicon-Via Inductors, Umamaheswara Rao Tida, Rongbo Yang, Cheng Zhuo, Yiyu Shi
On The Efficacy Of Through-Silicon-Via Inductors, Umamaheswara Rao Tida, Rongbo Yang, Cheng Zhuo, Yiyu Shi
Electrical and Computer Engineering Faculty Research & Creative Works
Through-silicon-vias (TSVs) can potentially be used to implement inductors in 3-D integrated systems for minimal footprint and large inductance. However, different from conventional 2-D spiral inductors, TSV inductors are fully buried in the lossy substrate, thus suffering from low quality factors. In this paper, we systematically examine how various process and design parameters affect their performance. A few interesting phenomena that are unique to TSV inductors are observed. We then propose a novel shield mechanism utilizing the microchannel, a technique conventionally used for heat removal, to reduce the substrate loss. The technique increases the quality factor and inductance of the …
Experimental Study Of Counter-Doped Junction Termination Extension For 4h-Sic Power Devices, Jheng Yi Jiang, Hua Chih Hsu, Kuan Wei Chu, Chih Fang Huang, Feng Zhao
Experimental Study Of Counter-Doped Junction Termination Extension For 4h-Sic Power Devices, Jheng Yi Jiang, Hua Chih Hsu, Kuan Wei Chu, Chih Fang Huang, Feng Zhao
Electrical and Computer Engineering Faculty Research & Creative Works
In this letter, a counter-doped junction termination extension (CD-JTE) structure was experimentally implemented and studied. Two groups of 4H-SiC PiN diodes were fabricated with two n-type drift layer thicknesses of 11 and 30 \mu \text{m}, respectively, and with different termination structures, in order to demonstrate the wide JTE dose tolerance of CD-JTE. Three different doses, 1.7 \times 10^{13}, 2.2\times 10^{13} , and 2.8\times 10^{13} cm ^{-2} , were used for the critical JTE implantation. The measured breakdown voltages (BVs) of the diodes with all termination structures and JTE doses were compared with simulation predictions. Electroluminescence at the BV was recorded …
Real Time Mission Planning, Emad William Saad, Stefan Richard Bieniawski, Paul Edward Riley Pigg, John Lyle Vian, Paul Michael Robinette, Donald C. Wunsch
Real Time Mission Planning, Emad William Saad, Stefan Richard Bieniawski, Paul Edward Riley Pigg, John Lyle Vian, Paul Michael Robinette, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
The different advantageous embodiments provide a system comprising a number of computers, a graphical user interface, first program code stored on the computer, and second program code stored on the computer. The graphical user interface is executed by a computer in the number of computers. The computer is configured to run the first program code to define a mission using a number of mission elements. The computer is configured to run the second program code to generate instructions for a number of assets to execute the mission and monitor the number of assets during execution of the mission.
Optimal Selected Phasor Measurement Units For Identifying Multiple Line Outages In Smart Grid, Jie Wu, Jinjun Xiong, Prasenjit Shil, Yiyu Shi
Optimal Selected Phasor Measurement Units For Identifying Multiple Line Outages In Smart Grid, Jie Wu, Jinjun Xiong, Prasenjit Shil, Yiyu Shi
Electrical and Computer Engineering Faculty Research & Creative Works
Thanks to the advent of clock synchronization via the global positioning system (GPS), phasor measurement units (PMUs) collecting both the magnitude and phase angle with higher precision have implications for monitoring performance across the wide area of smart grids. Owing to high PMUs installation costs, developing optimal strategy of PMUs placement is important to monitor the transmission system status in the wide area. To characterize the performance of line outage identification, this paper firstly proposes the statistical model to describe the average identification capability of multiple line outages. Using this model, we develop a global optimal PMUs placement strategy to …
Preface, Gennady Fridman, Jeremy Levesley, Ivan Tyukin, Donald C. Wunsch
Preface, Gennady Fridman, Jeremy Levesley, Ivan Tyukin, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
In August 2014 a conference on “Model reduction across disciplines” was held in Leicester, UK. As a scientific field, model reduction is an important part of mathematical modelling and data analysis with very wide areas of applications. The main scientific goal of the conference was to facilitate interdisciplinary discussion of model reduction and coarse-graining methodologies in order to reveal their general mathematical nature. This time, however, the conference had an additional personal and more profound mission – it was dedicated to the 60th birthday of Professor Alexander Gorban (albeit with some delay) whose fantastic achievements in applying model reduction techniques …
Work-In-Progress: Statistics Components In A Circuits Laboratory For Ece Sophomores, Steve Eugene Watkins, Theresa M. Swift, Amardeep Kaur
Work-In-Progress: Statistics Components In A Circuits Laboratory For Ece Sophomores, Steve Eugene Watkins, Theresa M. Swift, Amardeep Kaur
Electrical and Computer Engineering Faculty Research & Creative Works
Statistics concepts are required for undergraduate curricula in electrical engineering and computer engineering (ECE). Accreditation guidelines specify that such instruction must include “applications appropriate to the program name” [ABET Criteria for Accrediting Engineering Programs, 2014-2015]. Curricula content in probability and statistics are commonly done in a stand-alone course, but additional exposure within engineering-content courses can provide great value. Many basic concepts can be introduced before the comprehensive stand-alone course. A good ECE context is an electrical circuits laboratory in which students need to understand electrical component tolerances and related design issues. Statistics-related assignments in a required, sophomore-level laboratory course are …
Methods And Systems For Biclustering Algorithm, Donald C. Wunsch, Rui Xu, Sejun Kim
Methods And Systems For Biclustering Algorithm, Donald C. Wunsch, Rui Xu, Sejun Kim
Electrical and Computer Engineering Faculty Research & Creative Works
Methods and systems for improved unsupervised learning are described. The unsupervised learning can consist of biclustering a data set, e.g., by biclustering subsets of the entire data set. In an example, the biclustering does not include feeding know and proven results into the biclustering methodology or system. A hierarchical approach can be used that feeds proven clusters back into the biclustering methodology or system as the input. Data that does not cluster may be discarded. Thus, a very large unknown data set can be acted on to learn about the data. The system is also amenable to parallelization.
Physical Interpretation Of Radiation And Transfer Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli
Physical Interpretation Of Radiation And Transfer Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
The characterization of power radiation and coupling has been an important research subject. The partial element equivalent circuit method (PEEC) is a powerful tool in bridging the electromagnetic modeling together with a circuit solver. Even though PEEC was a convenient tool for many quasi-static applications, in this paper, we propose a new approach for PEEC to calculate the radiated and coupled power from the distributive point of view. Formulations for both radiated and transferred powers are proposed based on a full wave PEEC model. Distributive power can be evaluated with negligible additional computational cost in PEEC implementations. The physical meaning …
Full-Wave Simulation Of An Imbalanced Differential Microstrip Line With Conductor Surface Roughness, Marina Koledintseva, Tracey Vincent, Sergiu Radu
Full-Wave Simulation Of An Imbalanced Differential Microstrip Line With Conductor Surface Roughness, Marina Koledintseva, Tracey Vincent, Sergiu Radu
Electrical and Computer Engineering Faculty Research & Creative Works
This study investigates the full-wave numerical electromagnetic analysis of edge-coupled differential microstrip lines on a printed circuit board (PCB), when conductor surface roughness is taken into account. Mixed mode parameters of such lines are analyzed. The imbalance in the electric lengths of the traces causes the appearance of common-mode currents, as well as mode conversion: differential mode (DM) to common-mode (CM) and CM to DM. The presence of the solder mask on top of the PCB with microstrip traces is also taken into account. The differential lines modeled in this work are of three types: straight, bent, and curved. The …
Facial Structure Analysis Separates Autism Spectrum Disorders Into Meaningful Clinical Subgroups, Tayo Obafemi-Ajayi, Judith H. Miles, T. Nicole Takahashi, Wenchuan Qi, Kristina Aldridge, Minqi Zhang, Shi Qing Xin, Ying He, Ye Duan
Facial Structure Analysis Separates Autism Spectrum Disorders Into Meaningful Clinical Subgroups, Tayo Obafemi-Ajayi, Judith H. Miles, T. Nicole Takahashi, Wenchuan Qi, Kristina Aldridge, Minqi Zhang, Shi Qing Xin, Ying He, Ye Duan
Electrical and Computer Engineering Faculty Research & Creative Works
Varied cluster analysis were applied to facial surface measurements from 62 prepubertal boys with essential autism to determine whether facial morphology constitutes viable biomarker for delineation of discrete Autism Spectrum Disorders (ASD) subgroups. Earlier study indicated utility of facial morphology for autism subgrouping (Aldridge et al. in Mol Autism 2(1):15, 2011). Geodesic distances between standardized facial landmarks were measured from three-dimensional stereo-photogrammetric images. Subjects were evaluated for autism-related symptoms, neurologic, cognitive, familial, and phenotypic variants. The most compact cluster is clinically characterized by severe ASD, significant cognitive impairment and language regression. This verifies utility of facially-based ASD subtypes and validates …
Selective Body Biasing For Post-Silicon Tuning Of Sub-Threshold Designs: An Adaptive Filtering Approach, Hui Geng, Jianming Liu, Pei Wen Luo, Liang Chia Cheng, Steven L. Grant
Selective Body Biasing For Post-Silicon Tuning Of Sub-Threshold Designs: An Adaptive Filtering Approach, Hui Geng, Jianming Liu, Pei Wen Luo, Liang Chia Cheng, Steven L. Grant
Electrical and Computer Engineering Faculty Research & Creative Works
A sub-threshold design could provide a compelling approach to power critical applications. An exponential relationship exists, however, between the delay and the threshold voltage, that makes this design-time timing closure extremely difficult, if not impossible, to achieve. Several previous studies were focused on the technique of body biasing during post-silicon tuning for delay compensation. But they were mostly for super-threshold designs where spatially correlated L eff variation dominates. They cannot be applied directly to sub-threshold designs in which purely random threshold voltage variations dominate. These works also assumed multiple body biasing voltage domains and multiple body biasing voltage levels, which …
The Contour Deformation Method For Calculating The High-Frequency Scattered Field By The Fock Current On The Surface Of The 3-D Convex Cylinder, Yu Mao Wu, Li (Lijun) Jun Jiang, Weng Cho Chew, Ya Qiu Jin
The Contour Deformation Method For Calculating The High-Frequency Scattered Field By The Fock Current On The Surface Of The 3-D Convex Cylinder, Yu Mao Wu, Li (Lijun) Jun Jiang, Weng Cho Chew, Ya Qiu Jin
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, the high-frequency diffracted waves like the creeping waves are comprehensively analyzed by the Fock currents. On invoking the contour deformation method, the highly oscillatory Fock currents are efficiently calculated. Furthermore, the workload for the calculation of Fock currents is frequency-independent. To capture the high-frequency wave physics phenomenon, the Fock current is separated into the classical physical optics (PO) current and the nonuniform (NU)-Fock current along the shadow boundary and in the deep shadow region. To calculate the highly oscillatory scattered wave fields from the Fock current, quadratic approximations of the phase functions in the integrand are adopted. …
Wavelength-Selective Switch With Direct Few Mode Fiber Integration, D. M. Marom, J. Dunayevsky, D. Sinefeld, M. Blau, Roland Ryf, Nicolas K. Fontaine, M. Montoliu, S. Randel, C. Liu, B. Ercan, Mina Esmaeelpour, For Full List Of Authors, See Publisher's Website.
Wavelength-Selective Switch With Direct Few Mode Fiber Integration, D. M. Marom, J. Dunayevsky, D. Sinefeld, M. Blau, Roland Ryf, Nicolas K. Fontaine, M. Montoliu, S. Randel, C. Liu, B. Ercan, Mina Esmaeelpour, For Full List Of Authors, See Publisher's Website.
Electrical and Computer Engineering Faculty Research & Creative Works
The first realization of a wavelength-selective switch (WSS) with direct integration of few mode fibers (FMF) is fully described. The freespace optics FMF-WSS dynamically steers spectral information-bearing beams containing three spatial modes from an input port to one of nine output ports using a phase spatial light modulator. Sources of mode dependent losses (MDL) are identified, analytically analyzed and experimentally confirmed on account of different modal sensitivities to fiber coupling in imperfect imaging and at spectral channel edges due to mode clipping. These performance impacting effects can be reduced by adhering to provided design guidelines, which scale in support of …
A Kalman Filter For Stereophonic Acoustic Echo Cancellation, Constantin Paleologu, Jacob Benesty, Steven L. Grant, Silviu Ciochina
A Kalman Filter For Stereophonic Acoustic Echo Cancellation, Constantin Paleologu, Jacob Benesty, Steven L. Grant, Silviu Ciochina
Electrical and Computer Engineering Faculty Research & Creative Works
The stereophonic acoustic echo cancellation (SAEC) scheme was recently recast by using the widely linear (WL) model, i.e., as a single-input/single-output system with complex random variables. In this paper, we present a Kalman filter with individual control factors in the context of the WL model for SAEC. As a specific feature, this algorithm uses a different level of uncertainty for each coefficient of the filter. Simulation results indicate that the proposed algorithm outperforms the recursive least-squares (RLS) algorithm, which is usually considered as the benchmark for SAEC.
Echo Cancellation For Bone Conduction Transducers, Mohammadhossein Behgam, Steven L. Grant
Echo Cancellation For Bone Conduction Transducers, Mohammadhossein Behgam, Steven L. Grant
Electrical and Computer Engineering Faculty Research & Creative Works
Bone conducting transducers are attractive technologies for voice communication systems. Bone vibrators (BVs), typically located on the condyle bone, allow users to listen while leaving their outer ears open, enhancing situational awareness. Meanwhile, bone conduction microphones (BCMs), often located on the temple, increase the transmitted signal to noise ratio because they are relatively insensitive to ambient air born environmental noise. A communication headset consisting of a BV and a BCM is a natural combination of these promising technologies. The prospect of acoustic coupling between the BVs and BCMs results in acoustic echo if full-duplex communication is used. To our knowledge, …
Analytical Clustering Score With Application To Post-Placement Multi-Bit Flip-Flop Merging, Chang Xu, Peixin Li, Guojie Luo, Yiyu Shi, Iris Hui Ru Jiang
Analytical Clustering Score With Application To Post-Placement Multi-Bit Flip-Flop Merging, Chang Xu, Peixin Li, Guojie Luo, Yiyu Shi, Iris Hui Ru Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Circuit clustering is usually done through discrete optimizations, with the purpose of circuit size reduction or design-specific cluster formation. Specifically, we are interested in the multi-bit flip-flop (MBFF) design technique for clock power reduction, where all previous works rely on discrete clustering optimizations. For example, INTEGRA was the only existing post-placement MBFF clustering optimizer with a sub-quadratic time complexity. However, it degrades the wirelength severely, especially for realistic designs, which may cancel out the benefits of MBFF clustering. In this paper we enable the formulation of an analytical clustering score in nonlinear programming, where the wirelength objective can be seamlessly …