Search query: computationally efficient simulation of high frequency

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abstract: A computationally efficient simulation framework is set forth in which the semiconductor devices are represented by the physical phenomena relevant to the accurate prediction of high frequency circuit level transients and energy losses. Key elements of this framework include an encapsulated diode model and a method of coupling device models with those of external circuit elements given a user specified SPICE like netlist. The framework is applied to a single phase full bridge diode rectifier circuit with a discussion on time step requirements and overall computational performance. Comparisons between simulated and measured waveforms are also provided revealing excellent agreement.
author_names: Anand S Subbiah

Oleg Wasynczuk
title: Computationally Efficient Simulation of High Frequency Transients in Power Electronic Circuits
venue: IEEE Transactions on Power Electronics
year: 2016

abstract: In this letter, a structure of a small ultra wideband (UWB) monopole antenna, its design optimization procedure as well as experimental validation are presented. According to our approach, antenna compactness is achieved by means of a meander line for current path enlargement as well as the two parameterized slits providing additional degrees of freedom that help to ensure good impedance matching. For the sake of reliability, the antenna design process (simultaneous adjustment of multiple geometry parameters) is carried out using high fidelity EM analyses. Surrogate based optimization involving an auxiliary coarse discretization EM model it utilized to accomplish the design in practical timeframe. Penalty function approach allows us to reduce the antenna footprint (to only 15.8 x 22 mm2) while maintaining acceptable reflection in the UWB frequency range. Experimental validation of the design is also provided.
author_names: Adrian Bekasiewicz

Slawomir Koziel
title: Structure and Computationally Efficient Simulation Driven Design of Compact UWB Monopole Antenna
venue: IEEE Antennas and Wireless Propagation Letters
year: 2015

abstract: In this work, a model predictive control (MPC) strategy based on optimal switching sequence (OSS) concepts is proposed for a grid connected three level neutral point clamped converter. The proposed cascaded OSS MPC strategy does not require a weighting factor to balance the dc link capacitor voltages and optimally controls both the grid currents and the capacitor voltages even during disturbances and large step changes in the references. The resulting MPC strategy allows operating the converter with a predefined harmonic spectrum, fixed switching frequency, and fast and robust dynamic response. Besides, an efficient optimization algorithm is also introduced to reduce the computational burden typically observed in this kind of MPC strategies. Experimental and simulation results are provided to demonstrate the effectiveness and high quality performance of the proposed strategy.
author_names: Andres Mora

Roberto Cardenas-Dobson

Ricardo P Aguilera

Alejandro Angulo

Felipe Donoso

Jose R Rodriguez
title: Computationally Efficient Cascaded Optimal Switching Sequence MPC for Grid Connected Three Level NPC Converters
venue: IEEE Transactions on Power Electronics
year: 2019

abstract: This paper proposes a new dynamic model called Stochastic Tail Index (STI) model to analyze time varying tail index for financial asset using high frequency return data. Bayesian tools are developed to estimate the model, make related inferences, and perform model selection. To construct efficient posterior sampler for the STI model by an approximation approach, a new algorithm called ALSO (Auxiliary Least Squares Optimization) is introduced, which can quickly make sufficient approximation to a given random variable using Gaussian mixture variables. The posterior sampler takes advantages of the BFGS optimization method to tailor the proposal densities in Metropolis Hastings chains, and is computationally faster than the existing samplers in literature. Simulation shows that the proposed posterior sampler works well for the STI model. To illustrate the use of the STI model in the real world, we analyze two real high frequency data sets associated with two markets. It is found that the estimated daily tail indexes generally follow a time varying pattern and tend to fall when large negative events occur. Besides, they significantly drop below 2 during some periods, which implies that the variances of the return distributions during those periods may be infinite, and hence any variance based risk management for the two markets may be questionable.
author_names: Guangyu Mao

Zhengjun Zhang
title: Stochastic tail index model for high frequency financial data with Bayesian analysis
year: 2018

abstract: A numerically robust, computationally efficient method for modeling a high order system by means of low order transfer functions using a perfect reconstruction filter bank (PR FB) is proposed. Modeling the transfer functions associated with the characteristic impedance and propagation/weighting function of a frequency dependent transmission line (FDTL) over a wide range of frequencies typically involves rational function approximations (RFAs) of high order. Discretization of the high order RFAs is prone to numerical instability, especially when the ratio of the maximum pole over the minimum pole (condition number) is large. The proposed method improves numerical stability by employing several narrowband (subband) low order RFAs using a logarithmic tree structured perfect reconstruction filter bank. Moreover, the method is computationally efficient, since simulation of each subband is of low complexity and very suitable for parallel (multi core) processing.
author_names: Paraskevas E Argyropoulos

Hanoch Lev-Ari
title: Numerically stable, computationally efficient, filter bank based modeling of transfer functions for power system transient simulation
venue: 2015 IEEE Power and Energy Conference at Illinois (PECI)
year: 2015

abstract: In acoustic echo cancellation (AEC) systems, the partitioned block frequency domain adaptive filter (PBFDAF) algorithm is commonly adopted to improve the computational efficiency and convergence rate. However, the PBFDAF algorithm introduces an inherent delay. Delayless PBFDAF algorithms have been proposed to tackle this issue. However, the complexity of the existing delayless PBFDAF algorithms is high. Some have high average complexity, but others have high peak complexity. A computationally efficient delayless PBFDAF algorithm is proposed in this letter to reduce both the average and peak complexity. Moreover, a delay compensation method is presented to compensate the error path delay and thus speed up the convergence rate. Simulation results demonstrate that the convergence and tracking performance of the new algorithm with delay compensation is comparable with that of the PBFDAF algorithm.
author_names: Feiran Yang

Ming Wu

Jun Yang
title: A Computationally Efficient Delayless Frequency Domain Adaptive Filter Algorithm
venue: IEEE Transactions on Circuits and Systems II: Express Briefs
year: 2013

abstract: This paper describes a physics based methodology for computationally efficient statistical modeling of high frequency bipolar transistors along with its practical implementation into a production process design kit. Applications to statistical modeling, circuit simulation, and yield optimization are demonstrated for an opamp circuit. Experimental results are shown that verify the methodology
author_names: Wolfgang Schneider

M Schroter

W Kraus

Holger Wittkopf
title: Statistical simulation of high frequency bipolar circuits
venue: 2007 Design, Automation Test in Europe Conference Exhibition
year: 2007

abstract: This paper describes a physics based methodology for computationally efficient statistical modeling of high frequency bipolar transistors along with its practical implementation into a production process design kit. Applications to statistical modeling, circuit simulation, and yield optimization are demonstrated for an opamp circuit. Experimental results are shown that verify the methodology.
author_names: Wolfgang Schneider

Michael Schroter

W Kraus

Holger Wittkopf
title: Interactive presentation: Statistical simulation of high frequency bipolar circuits
venue: DATE '07
year: 2007

abstract: In orthogonal frequency division multiplexing (OFDM) system, high value of peak to average power ratio (PAPR) is an operational problem that may cause non linear distortion resulting in high bit error rate. Selected mapping (SLM) is a well known technique that shows good PAPR reduction capability but inflicts added computational overhead. In this paper, using Riemann sequence based SLM method, we applied reverse searching technique to find out low PAPR yielding phase sequences with significant reduction in computational complexity. Additionally, we explored side information free transmission that achieves higher throughput but sacrifices PAPR reduction. Finally, to overcome this loss in PAPR reduction, we proposed application of Square rooting companding technique over the output OFDM transmitted signal. Simulation results show that the proposed method is able to compensate the sacrifice in PAPR and achieved PAPR reduction of 8.9 dB with very low computational overhead.
author_names: Md Moshiur Rahman

Md Nur-Al-Safa Bhuiyan

Muhammad Sajjadur Rahim

Sabbir Ahmed
title: A computationally efficient selected mapping technique for reducing PAPR of OFDM
venue: Telecommun. Syst.
year: 2017

abstract: Sampling frequency offset (SFO) that occurs due to a sampling frequency mismatch between the transmitter and receiver oscillators is one of the main problem in the orthogonal frequency division multiplexing (OFDM) based digital terrestrial television (DTTV) system. The SFO can cause an intersymbol interference and an intercarrier interference that may degrade the performance of an OFDM system and result in high bit error rate. Since the value of SFO is usually very low (part per million scale) the SFO estimation is very susceptible to a noise. In this paper, we propose the estimation method that can minimize the influence of the noise in SFO estimation and also minimize the computational complexity. The performance of the proposed method has been verified with computer simulation. The computer simulation results show that the proposed sampling frequency offset estimation is more efficient in computational complexity compared to the conventional method to achieve the similar performance.
author_names: Nico Surantha

Yuhei Nagao

Masayuki Kurosaki

Hiroshi Ochi
title: A computationally efficient sampling frequency offset estimation for OFDM based digital terrestrial television systems
venue: 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)
year: 2013