Employing a recently introduced framework, within which a large number of classical and modern adaptive lter algorithms can be viewed as special cases, a generic, variable step-size adaptive lter has been presented. Variable Step-Size (VSS) Normalized Least Mean Square (VSSNLMS) and VSS A ne Projection Algorithms (VSSAPA) are particular examples of adaptive algorithms covered by this generic va...

| W e present a novel method{ lter decomposition approach, for multichannel blind de-convolution of non-minimum phase systems. In 20] we has developed an eecient natural gradient algorithm for causal FIR lters. In this paper we further study the natural gradient method for non-causal lters. We decompose the doubly nite l-ters into a product of two lters, a noncausal FIR lter and a causal FIR lt...

In the past decade, the search for feasible multiuser detectors for direct sequence code{ division multiple{access (DS{CDMA) systems has attracted high interest. Especially iterative multiuser detection schemes have gained attention due to their tractable complexity and good performance for moderate system loads = K=N (K denotes the number of users and N the spreading factor). So, various itera...

historical records of cheatgrass Bromus tectorum invasion in North American sagebrush-steppe Sumanta Bagchi*, David D. Briske, Brandon T. Bestelmeyer and X. Ben Wu Department of Ecosystem Science and Management, Texas A&M University, 2138 TAMU, College Station, TX 77843, USA; USDA-ARS, Jornada Experimental Range and Jornada Basin LTER, New Mexico State University, MSC 3JER, Box 30003, Las Cruce...

A novel structure called tapped cascaded adap-tive allpass lter is proposed. It is basically an adaptive nite impulse response (AFIR) lter where the delays are replaced by allpass lters. The system induces a better stability monitoring mechanism than in a generic adaptive inn-nite impulse (AIIR) lter. Two adaptation algorithms are derived. The rst one is for adapting the tap-weights when the al...

The discrete Kalman lter, which is becoming a common tool for reducing uncertainty in robot navigation, suuers from some basic limitations when used for such applications. In this paper, we describe a recursive total least squares estimator (RTLS) as an alternative to the Kalman lter, and compare their performances in three sets of experiments involving problems in robot navigation. In all case...

The paper focuses on the improvement of the quality of isosurfaces tted on volume datasets with respect to standard MC solutions. The new solution presented improves the precision in the reconstruction process using an approach based on mesh re nement and driven by the evaluation of the trilinear reconstruction lter. The iso-surface reconstruction process is adaptive, to ensure that the complex...

An impressive variety of multirate lter banks evolved during the past twenty years. We present an algebraic approach that subsumes many concepts developed so far (e. g. multi lters, nonseparable multidimensional lter banks, cyclic lter banks, lter banks with values in nite elds, etc.). In our approach the signals and lters are viewed as elements of a group ring. We give necessary and su cient c...

In this paper, we present a new discrete Lagrangian optimization method for designing multiplier-less QMF (quadrature mirror lter) lter banks. In multiplierless QMF lter banks, lter coeecients are powers-of-two (PO2) where numbers are represented as sums or diierences of powers of two (also called Canonical Signed Digit{CSD{representation), and multiplications can be carried out as additions , ...

A common method for measuring the mass of organic carbon in airborne particulate matter involves collection on a quartz "lter and subsequent thermal analysis. If unaccounted for, the adsorption of organic gases onto quartz "lters will lead to the overestimation of aerosol organic carbon concentrations (positive artifact). A recommended method of correction for the positive artifact involves sam...