Browsing by Keywords "Maximum likelihood estimation"
Now showing items 120 of 24

Algebraic error analysis of collinear feature points for camera parameter estimation
(Elsevier, 20110104)In general, feature points and camera parameters can only be estimated with limited accuracy due to noisy images. In case of collinear feature points, it is possible to benefit from this geometrical regularity by correcting ... 
Constrained nonlinear programming for volatility estimation with GARCH models
(2003)This paper proposes a constrained nonlinear programming view of generalized autoregressive conditional heteroskedasticity (GARCH) volatility estimation models in financial econometrics. These models are usually presented ... 
A distributed positioning algorithm for cooperative active and passive sensors
(2010)The problem of positioning a target node is studied for wireless sensor networks with cooperative active and passive sensors. Twoway timeofarrival and timedifferenceofarrival measurements made by both active and ... 
Enhanced position estimation via node cooperation
(2010)Twoway timeofarrival (TWToA) is a widely used ranging protocol that can provide the distance between two devices without time synchronization. One drawback of the TWToA is poor positioning accuracy in the absence of ... 
Hybrid TWTOA/TDOA positioning algorithms for cooperative wireless networks
(2011)The problem of positioning an unknown target is studied for a cooperative wireless sensor network using hybrid twoway timeofarrival and timedifferenceofarrival measurements. A maximum likelihood estimator (MLE) can ... 
Improved position estimation using hybrid TWTOA and TDOA in cooperative networks
(Institute of Electrical and Electronics Engineers, 20120413)This paper addresses the problem of positioning multiple target nodes in a cooperative wireless sensor network in the presence of unknown turnaround times. In this type of cooperative networks, two different reference ... 
Inflation and inflation uncertainty in the G7 countries
(Elsevier BV, 2005)This study examines the relationship between inflation and inflation uncertainty in the G7 countries for the period from 1957 to 2001. The causality between the inflation and inflation uncertainty is tested by using the ... 
Interactive training of advanced classifiers for mining remote sensing image archives
(2004)Advances in satellite technology and availability of downloaded images constantly increase the sizes of remote sensing image archives. Automatic content extraction, classification and contentbased retrieval have become ... 
A locally optimal seasonal unitroot test
(Taylor & Francis Inc., 1998)This article proposes a locally best invariant test of the null hypothesis of seasonal stationarity against the alternative of seasonal unit roots at all or individual seasonal frequencies. An asymptotic distribution theory ... 
Location and curvature estimation of spherical targets using multiple sonar timeofflight measurements
(Institute of Electrical and Electronics Engineers, 199912)A novel, flexible, threedimensional multisensor sonar system is described to localize the center of a generalized spherical target and estimate its radius of curvature. Point, line, and planar targets are included as ... 
Maximum likelihood estimation of Gaussian mixture models using particle swarm optimization
(IEEE, 2010)We present solutions to two problems that prevent the effective use of populationbased algorithms in clustering problems. The first solution presents a new representation for arbitrary covariance matrices that allows ... 
Maximum likelihood estimation of Gaussian mixture models using stochastic search
(Elsevier BV, 2012)Gaussian mixture models (GMM), commonly used in pattern recognition and machine learning, provide a flexible probabilistic model for the data. The conventional expectationmaximization (EM) algorithm for the maximum likelihood ... 
On the reliability exponent of the exponential timing channel
(IEEE, 2002)We determine the reliability exponent E(R) of the AnantharamVerdú exponential server timing channel with service rate μ for all rates R between a critical rate R c = (μ/4) log 2 and the channel capacity C = e 1μ. For ... 
Positioning algorithms for cooperative networks in the presence of an unknown turnaround time
(2011)This paper addresses the problem of single node positioning in cooperative network using hybrid twoway timeofarrival and timedifferenceofarrival where, the turnaround time at the target node is unknown. Considering ... 
Robust directionofarrival estimation in nonGaussian noise
(Institute of Electrical and Electronics Engineers, 199805)In this correspondence, a nonlinearly weighted leastsquares method is developed for robust modeling of sensor array data. Weighting functions for various observation noise scenarios are determined using maximum likelihood ... 
Signal denoising by piecewise continuous polynomial fitting
(2010)Piecewise smooth signal denoising is cast as a nonlinear optimization problem in terms of transition boundaries and a parametric smooth signal family. Optimal transition boundaries for a given number of transitions are ... 
Successive cancelation approach for doppler frequency estimation in pulse doppler radar systems
(2010)In this paper, a successive cancelation approach is proposed to estimate Doppler frequencies of targets in pulse Doppler radar systems. This technique utilizes the Doppler domain waveform structure of the received signal ... 
A survey on wireless position estimation
(Springer New York LLC, 2008)In this paper, an overview of various algorithms for wireless position estimation is presented. Although the position of a node in a wireless network can be estimated directly from the signals traveling between that node ... 
Time delay estimation in cognitive radio systems
(2009)In cognitive radio systems, secondary users can utilize multiple dispersed bands that are not used by primary users. In this paper, time delay estimation of signals that occupy multiple dispersed bands is studied. First, ... 
Timedelay estimation in dispersed spectrum cognitive radio systems
(SpringerOpen, 2010)Timedelay estimation is studied for cognitive radio systems, which facilitate opportunistic use of spectral resources. A twostep approach is proposed to obtain accurate timedelay estimates of signals that occupy multiple ...