11,925 Hits in 10.1 sec

Equiripple minimum phase FIR filter design from linear phase systems using root moments

T. Stathaki, I. Fotinopoulos
2001 IEEE transactions on circuits and systems - 2, Analog and digital signal processing  
A novel approach is taken, that involves the use of a set of parameters called root moments of a polynomial, derivable directly from the polynomial coefficients that immensely facilitate the factorization  ...  of polynomials of very large order.  ...  The MP filter exhibits a very significant saving in group delay for high orders, compared with the LP equivalent.  ... 
doi:10.1109/82.943328 fatcat:jbh3yub2obdw7nrumwd4fbv2jy

Novel Digital Compensation Approaches for Envelope Tracking Amplifiers

Atso Hekkala, Adrian Kotelba, Mika Lasanen, Pertti Järvensivu, Aarne Mämmelä
2010 Wireless personal communications  
In addition, we develop new algorithms for time misalignment compensation between the input signals of the ET amplifier and compare the methods to a previously presented method.  ...  In addition, the time misalignment compensation methods give very accurate timing estimates.  ...  Often, only odd order terms of K are used in polynomial predistorters [17] . Instead of that, here we use also even order terms due to high nonlinearity of the ET amplifier.  ... 
doi:10.1007/s11277-010-0038-0 fatcat:ik7z3xfc5fd7jepzy56o4rvoym

Noise will be noise: Or phase optimized recursive filters for interference suppression, signal differentiation and state estimation (extended version) [article]

Hugh L. Kennedy
2021 arXiv   pre-print
Flatness constraints of arbitrary order are derived for temporal derivatives of arbitrary order and a prescribed group delay.  ...  estimation problems with uncertain signal models.  ...  A general expression for high-order dc constraints (to encourage passband phase linearity) in a filter with an arbitrary group delay is derived.  ... 
arXiv:2106.00434v2 fatcat:xwaj5vuk5rhrtpm3aivkpol2pi

Design of delayed fractional state variable filter for parameter estimation of fractional nonlinear models

Walid Allafi, Ivan Zajic, Kotub Uddin, Zhonghua Shen, James Marco, Keith Burnham
2018 Nonlinear dynamics  
This paper presents a novel direct parameter estimation method for continuous-time fractional nonlinear models.  ...  This is achieved by adapting a filterbased approach that uses the delayed fractional state variable filter for estimating the nonlinear model parameters directly from the measured sampled inputoutput data  ...  The DFSVF contains a cascade of all-pass filters, for group delay equalisation, and proposed, a novel, fractional Butterworth filter (FBF).  ... 
doi:10.1007/s11071-018-4519-0 fatcat:ey5ka27vkfh55h5qrdkymj3dia

A Novel Approach for Modeling Neural Responses to Joint Perturbations Using the NARMAX Method and a Hierarchical Neural Network

Runfeng Tian, Yuan Yang, Frans C. T. van der Helm, Julius P. A. Dewald
2018 Frontiers in Computational Neuroscience  
This study provides a novel approach for precise modeling of cortical responses to sensory input.  ...  Different from the commonly used polynomial NARMAX method, the proposed approach replaced the polynomial non-linear terms with a hierarchical neural network.  ...  and p(k) the position signal, d 1 is the shortest delay in the group Ia afferent pathway for transmitting the velocity and position signals, and d 2 is the shortest delay in the group II afferent pathway  ... 
doi:10.3389/fncom.2018.00096 pmid:30574083 pmcid:PMC6291451 fatcat:p4ixpnee2zebla2jtljwsm4gcu

An Algebraic Approach to the Estimation of the Order of FIR Filters From Complete and Partial Magnitude and Phase Specifications

Anthony G. Constantinides, Wen Min Li
2007 IEEE Transactions on Signal Processing  
furnishes a nexus for order estimation from phase (or group delay) specifications, areas which have remained hitherto unaddressed.  ...  In this context, the novel concept of Fractional Root Moments is used in a key fashion to provide an estimate on the number of zeros inside the unit circle.  ...  the FIR filter order estimation from phase or group delay or some combinations of all independent specifications.  ... 
doi:10.1109/tsp.2006.887565 fatcat:wzgg3dl2wrfqjocz3f7h2hbofu

Graphic Delay Equalizer

Jussi Ramo, Vesa Valimaki
2019 ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)  
This paper proposes a novel concept of a graphic delay equalizer, which is based on a high-order allpass (AP) filter.  ...  Example use cases included the correction of the group delay of a loudspeaker and of a graphic (magnitude) equalizer in order to improve their perceived phase response.  ... 
doi:10.1109/icassp.2019.8682949 dblp:conf/icassp/RamoV19 fatcat:iptczyuatjfi3p32zlpphl4mvq

Zeros of the z-transform (ZZT) representation and chirp group delay processing for the analysis of source and filter characteristics of speech signals

Baris Bozkurt, Thierry Dutiot
2005 Zenodo  
Using the two representations, effective algorithms are developed for: source-tract decomposition of speech, glottal flow parameter estimation, formant tracking and feature extraction for speech recognition  ...  In addition, new chirp group delay processing techniques are developed for analysis of resonances of a signal.  ...  Finding the roots of high degree polynomials Computation of the ZZT of a discrete-time signal necessitates finding the roots of high degree polynomials.  ... 
doi:10.5281/zenodo.1914906 fatcat:4lt4asxexvdlrdhykzb5otyz4q

Design Study for a Quasisynchronous CDMA Sensor Data Collection System: An LEO Satellite Uplink Access Technique Based on GPS

Yijun Chen, Sheng Ding, Zhouchen Xie, Zhuangping Qi, Xuwen Liang
2015 International Journal of Distributed Sensor Networks  
A novel analysis method for the accuracy of clock synchronization and a novel method for the estimation of Doppler shift and propagation delay are presented.  ...  Previous research had not provided estimation and analysis method for Doppler shift and propagation delay either.  ...  The QS-CDMA system uses a group of shift-msequences whose code length is 1023 and can provide service to 1023 users at one time.  ... 
doi:10.1155/2015/421745 fatcat:2pzxfiq3n5agpcjdu4bfw5zyie

A maximum likelihood digital receiver using coordinate ascent and the discrete wavelet transform

I. Sharfer, A.O. Hero
1999 IEEE Transactions on Signal Processing  
The novelty of the algorithm is due to the use of a multi-resolution expansion of the received signal and the use of polynomial rooting in the complex plane in place of a line search o ver the signal delay  ...  In this paper a Maximum Likelihood ML method is presented for joint estimation of amplitude, phase, time delay, and data symbols in a single user direct sequence spread spectrum communication system.  ...  Fourier series and polynomial rooting were used to simplify the delay parameter line search, and a multiresolution wavelet representation of the received signal was used to e ciently match parameter updates  ... 
doi:10.1109/78.747786 fatcat:mvkz6dumv5cetjo3ldf6zzu76m

Accelerating Silicon Photonic Parameter Extraction using Artificial Neural Networks [article]

Alec M. Hammond, Easton Potokar, Ryan M. Camacho
2019 arXiv   pre-print
We present a novel silicon photonic parameter extraction tool that uses artificial neural networks.  ...  We then estimate the actual device parameters by iteratively fitting the simultaneously measured group delay and reflection profiles to the artificial neural network output.  ...  Enxiao Luan performed the measurements at The University of British Columbia. Disclosures The authors declare that there are no conflicts of interest related to this article. References  ... 
arXiv:1901.08176v1 fatcat:hgdyph4e5bb5hfz5tkkrler2ei

Auditory motivated level-crossing approach to instantaneous frequency estimation

S.C. Sekhar, T.V. Sreenivas
2005 IEEE Transactions on Signal Processing  
We address the problem of estimating the instantaneous frequency (IF) of a phase signal using its level-crossing (LC) information based on front-end auditory processing motivation.  ...  We consider two types of IF-polynomial and bandlimited; we use polynomial interpolating functions for the former, and for the latter, we propose a novel "line plus sum of sines" model.  ...  ACKNOWLEDGMENT The authors thank the Speech and Audio Group at the Department of Electrical Communication Engineering, Indian Institute of Science, for fruitful discussions; T. Strohmer, R.  ... 
doi:10.1109/tsp.2005.843736 fatcat:cjubcmdafndxzjb3fogiimb2ie

Feedback Control of Oxygen Uptake During Treadmill Exercise

K.J. Hunt, B. Ajayi, H. Gollee, L. Jamieson
2008 IEEE Transactions on Control Systems Technology  
This resulted in selection of a first-order model with a time constant of 47 s. This model was used to design linear feedback controllers with a range of closed-loop bandwidth specifications.  ...  A series of closed-loop control tests illustrate that a single, fixed-parameter controller designed using a dynamic model from just one subject is robust enough to provide satisfactory control of a desired  ...  Grant, formerly of the Faculty of Biomedical and Life Sciences, University of Glasgow, Glasgow, U.K., for his contribution to this paper.  ... 
doi:10.1109/tcst.2007.912116 fatcat:4f5wljsv4fhj5bccxplvtavhdy

Digital Compensation of Amplifier Nonlinearities in the Receiver of a Wireless System

Cedric Dehos, Tim C. W. Schenk
2007 2007 14th IEEE Symposium on Communications and Vehicular Technology in the Benelux  
In order to enable efficient implementation of wireless systems with high signal dynamics, this paper proposes an approach to estimate and correct for the amplitude and phase distortion caused by nonlinear  ...  The approach comprises a preamble design, an estimation method and a digital compensation algorithm.  ...  The work of Tim Schenk was sponsored in part by the B4 BroadBand Radio@Hand project (BTS01063) and in part by a travel grant of the Netherlands Organization for Scientific Research (NWO).  ... 
doi:10.1109/scvt.2007.4436243 fatcat:leirh3ovubd4vmgkjbdd3f6yf4

Design and Performance Analysis of GPS Based Precise Relative Navigation for Rendezvous and Formation Flying Missions in Low Earth Orbit

One is a test using spacebourne GPS receivers and a GPS signal simulator to evaluate the performance and sensitivity of the software against variation of parameters.  ...  The navigation filter estimates float navigation solutions by extended Kalman filter with elaborate dynamics models, and resolves ambiguities of integer carrier phase biases to achieve high accuracy fix  ...  On the other hand, utilization of GRAPHIC data requires a high computational cost for the estimation of carrier phase biases for all available GPS signals.  ... 
doi:10.2322/tastj.8.pd_75 fatcat:cq6caforz5eczfoaobjgkovcre
« Previous Showing results 1 — 15 out of 11,925 results