2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628)
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Các bài báo tiêu biểu
Improving the speed and performance of adaptive equalizers via transform based adaptive filtering
Tập 2 - Trang 1301-1304 vol.2
Adaptive equalizers are widely used in many communication systems where the
channel frequency response characteristics are either time varying or unknown
such as the case in wireless and dial up telecommunication networks where the
communication channel constantly change due to the different packet routes and
switching that takes place, as well as due to the changes in the RF propagation.
This wor...
#Adaptive equalizers #Adaptive filters #Discrete Fourier transforms #Discrete wavelet transforms #Fourier transforms #Discrete cosine transforms #Eigenvalues and eigenfunctions #Frequency response #Time varying systems #Communication channels
Recursive non parametric spectral estimation from irregularly sampled observations
Tập 2 - Trang 799-802 vol.2
In this paper, the nonparametric spectral analysis of a randomly sampled signal
is discussed. In particular, a class of estimators is introduced: the IRINCORREL
class. This class is composed of recursive algorithms which both take into
account the sampling irregularity and the correlation of the signal values. The
study of the mean square estimation error shows that there is a trade off
between bi...
#Recursive estimation #Sampling methods #Spectral analysis #Signal processing algorithms #Frequency #Random variables #Large Hadron Collider #Estimation error #Convergence #Signal processing
Position determination of a subsurface object by combined output of two receive GPR antennas
Tập 2 - Trang 901-904 vol.2
A new algorithm is proposed for subsurface object detection and 3D localization
using ground-penetrating radar (GPR) data, if GPR antennas are slightly elevated
above the ground. Due to an effective approximation, the algorithm solves
problems linked to calculating the position of the refracting point of
electromagnetic waves on the air-ground interface. We present how the typical
hyperbolic objec...
#Ground penetrating radar #Receiving antennas #Object detection #Electromagnetic scattering #Data mining #Antennas and propagation #Radar antennas #Approximation algorithms #Electromagnetic refraction #Radar detection
Efficient real-time noise estimation without explicit speech, non-speech detection: an assessment on the AURORA corpus
Tập 2 - Trang 985-988 vol.2
This paper addresses the problem of noise estimation for speech enhancement and
automatic speech recognition. In the context of mobile telephony, there is a
requirement for low resource algorithms which must run at real-time. This paper
describes the implementation of a previously published approach, termed
quantile-based noise estimation, integrated within a conventional spectral
subtraction fram...
#Speech enhancement #Automatic speech recognition #Telephony #Speech recognition #Proposals #Noise robustness #Additive noise #Background noise #Network servers #Telecommunication traffic
Directly estimated multiuser detectors for code-division multiple-access signals and their adaptive implementation
Tập 2 - Trang 631-634 vol.2
This paper presents adaptive multiuser CDMA detection techniques for wireless
communication systems. Directly estimated adaptive (DEA) detectors are developed
by formulating multiuser CDMA detection as an inverse problem in the presence of
channel-induced interference and noise. The estimation of the detector
parameters is accomplished using elements of regularization theory. The
regularized solut...
#Adaptive signal detection #Detectors #Multiaccess communication #Pulse modulation #Base stations #Wireless communication #Interference #Adaptive algorithm #Degradation #Binary phase shift keying
Real and complex genomic signals
Tập 2 - Trang 543-546 vol.2
The paper discusses the ways of converting DNA sequences from their symbolic -
nucleotide, codon and amino acid - forms into corresponding digital signals. It
is shown that all the real and complex mappings can be derived from the same
original tetrahedral representation of the genetic code (GC). The reduction of
the representation dimensionality results from the projection of the GC
tetrahedron o...
#Genomics #Bioinformatics #Sequences #DNA #Amino acids #Genetics #Signal mapping #Signal processing #Digital signal processing #Signal analysis
A fast object detection algorithm using motion-based region-of-interest determination
Tập 2 - Trang 1105-1108 vol.2
In this paper, we present a new fast algorithm for achieving motion-based object
detection in an image sequence. While in most existing object-detection
algorithms, segmentation of the image is done as the first step followed by
grouping of segments, the proposed algorithm uses the motion information to
first identify what we call region of interest. Segmentation is done only within
a square of in...
#Object detection #Image segmentation #Surface topography #Image sequences #Motion estimation #Motion detection #Pixel #Shape #Tracking #Video coding
A new method for complete-to-overcomplete discrete wavelet transforms
Tập 2 - Trang 501-504 vol.2
Overcomplete discrete wavelet transforms (ODWT) are used in a number of
applications because they provide shift invariance, a property extremely useful
in wavelet-based image processing and video coding. In this paper, we propose a
new construction of the ODWT starting from the subbands of the critically
sampled (complete) DWT. The most straightforward application of our theory is
scalable video c...
#Discrete wavelet transforms #Video coding #Filters #Image processing #Motion estimation #Image reconstruction #Parallel processing #Filtering #Production #Concurrent computing
Evolutionary self-adaptive multimodel prediction algorithms of the fetal magnetocardiogram
Tập 2 - Trang 1149-1152 vol.2
A novel technique for the analysis, nonlinear model identification and
prediction of the fetal magnetocardiogram (f-MCG) is presented. f-MCGs can be
recorded with the use of specific totally non-invasive superconductive quantum
interference devices (SQUID). For the analysis and classification of the f-MCG
signals we introduce an intelligent method that combines the following well
known advanced si...
#Prediction algorithms #Signal processing algorithms #Superconducting magnets #Magnetic analysis #Signal processing #Predictive models #Magnetic devices #Superconductivity #Interference #SQUIDs
m-HDAF multiresolution deformable models
Tập 2 - Trang 505-508 vol.2
In this paper, we construct a new class of deformable models using new
orthogonal wavelets, named modified Hermite distributed approximating functional
(m-HDAF) wavelets. The scaling functions of this new family are symmetric and
the corresponding wavelets optimize their smoothness for a given number of
vanishing moments. In addition, we embed these multiresolution deformable models
to the physics...
#Deformable models #Shape #Filters #Chemistry #Fitting #Computer science #Mathematics #Physics #Laboratories #Solid modeling