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Interference suppression in spread spectrum systems

Interference suppression in spread spectrum systems

引用

IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： J.G. Proakis Department of Electrical and Computer Engineering Communications and Digital Signal Processing Center Northeastern University Boston MA USA

The interference immunity of a spread spectrum digital communication system corrupted by interference can be significantly enhanced by excising the interference prior to cross correlation of the received signal with the possible transmitted reference signals. In this paper we treat methods for excising narrowband (partial band) and broadband (impulsive) interference in direct-sequence and frequency-hopped spread spectrum systems. Excision methods based on linear prediction and nonlinear filtering algorithms are shown to be particularly effective for direct-sequence spread spectrum systems corrupted by narrowband interference. We also consider nonlinear excision methods for frequency-hopped spread spectrum systems corrupted by narrowband interference and direct-sequence spread spectrum systems corrupted by broadband (impulsive) interference.

关键词： Interference suppression Spread spectrum communication Narrowband Frequency Wideband Digital communication Jamming signal processing Degradation Matched filters

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Reduced-state maximum-likelihood sequence detection for magnetic recording channels

Reduced-state maximum-likelihood sequence detection for magn...

引用

IEEE Workshop on Statistical signal and Array processing

作者： Jindong Li J.G. Proakis Center for Communication and Digital Signal Processing Department of Electrical and Computer Engineering Northeastern University Boston MA USA

ISBN: (纸本)0818675764

This paper is focused on the design of partial response equalized channels and maximum-likelihood sequence detection for high density magnetic recording systems. Methods for designing linearly equalized partial response channels are presented and applied to a Lorentzian model for the magnetic recording channel. Reduced-state maximum-likelihood sequence detection methods are employed for the partial response equalized channels and the error rate performances of the detectors are evaluated.

关键词： Maximum likelihood detection Magnetic recording Intersymbol interference Design methodology Error analysis Decision feedback equalizers Delay Noise reduction Finite impulse response filter Digital signal processing

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Statistical geometric features-extensions for cytological texture analysis

Statistical geometric features-extensions for cytological te...

引用

International Conference on Pattern Recognition

作者： R.F. Walker P.T. Jackway Cooperative Research Centre for Sensor Signal and Information Processing Department of Electrical and Computer Engineering University of Queensland Australia

Statistical geometric features (SGF) have recently been proposed for the classification of image textures. The SGF method is easily extended to use other geometric properties of connected regions. Following a brief review of the method, we propose such an extension to the set of SCF features for the purpose of classifying cervical cell textures. The resulting method proves to be as powerful as the gray level co-occurrence matrix (GLCM) method of texture analysis, when tested on a set of 117 cervical cell images. The ability to define features tailored to the geometric properties of the textures concerned makes this method a powerful analysis tool.

关键词： Pixel Image texture analysis Testing Feature extraction Gray-scale Statistics Image analysis Information analysis signal analysis Image sensors

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Lossless and lossy coding of 3D moving medical data

Lossless and lossy coding of 3D moving medical data

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： A. Saflekos D. Tzovaras S. Malassiotis M.G. Strintzis Information Processing Laboratory Department of Electrical and Computer Engineering University of Thessaloniki Thessaloniki Greece

A novel 3D motion compensation algorithm for the coding of 3D medical image sequences is presented. The temporal correlation existing between successive in time 3D data sets is exploited using a 3D cube matching algorithm (CMA). In order to cope with more complex motions and to adapt compensation to the high-activity regions, a 3D warping based motion estimation technique is introduced. The methods are evaluated experimentally for the coding of an 3D image sequence of a beating heart.

关键词： Image coding Biomedical imaging Motion estimation Image sequences Propagation losses Magnetic resonance imaging Motion compensation Heart Image storage Space technology

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Array channel identification using direction of arrival parametrization

Array channel identification using direction of arrival para...

引用

International Conference on Universal Personal Communications

作者： E. Lindskog Signal Processing Group University of Uppsala Sweden Department of Electrical and Computer Engineering Northeastern University Boston MA USA

In mobile radio communication, the use of an antenna array can improve the performance of the reception. By using an antenna array it becomes possible to form beams towards the desired signals while "nulling out" interfering signals. Identification of a radio channel to an antenna array, using a parametrization in direction of arrival and gains of signal paths, has been investigated. This channel estimate is compared to a least squares FIR channel identification. For the scenarios studied, the parametrized method had better performance than the least squares method. Especially, the parametrized method has an improved performance in the presence of strong co-channel interferers. The parametrized method is however more complex and relies on estimates of the number of signals arriving to the antenna array.

关键词： Antenna arrays Maximum likelihood estimation Least squares methods Decision feedback equalizers Finite impulse response filter Receiving antennas Directive antennas signal processing Least squares approximation Intersymbol interference

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Performance comparisons of MSN codes for multi-track magnetic recording systems

Performance comparisons of MSN codes for multi-track magneti...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： E. Kurtas J.G. Proakis M. Salehi Communications and Digital Signal Processing CDSP Center Department of Electrical and Computer Engineering Northeastern University Boston MA USA

We consider the coding for multi-track magnetic recording systems. We provide analytical results related to uncoded and coded multi-track systems which constitute the basis of the code construction. We have designed matched spectral null codes for multi-track recording systems which give coding gains from 3 dB to 4.8 dB over uncoded systems. We also provide the performance comparisons of such codes under various receiver (head) topologies.

关键词： Magnetic recording Modulation coding Magnetic modulators Interference constraints Timing Gain control Digital magnetic recording CD recording Digital signal processing Magnetic analysis

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Efficient simulation of cell loss probability in ATM networks with heterogeneous connection traffic descriptors

Efficient simulation of cell loss probability in ATM network...

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IEEE International Conference on Communications (ICC)

作者： J.A. Freebersyser J.K. Townsend Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

In ATM networks, the purpose of connection admission control is to decide if allowing a new connection into the network violates a quality of service measure of the new connection or the existing connections. Instead of using statistical frame models, we represent the connection entering the network by the connection frame descriptors standardized by the ATM Forum and used by the connection admission control algorithms. We examine traffic sources described by heterogeneous connection frame descriptors in order to analyze constant bit rate sources versus variable bit rate sources, as well as different classes of variable bit rate sources. We use Monte Carlo simulation to estimate the cell loss probability of the combined traffic stream, as well as the individual classes using both random buffer filling and priority buffer filling schemes. Importance sampling is used to increase the efficiency of the simulation. For the experiments example considered, the improvement in simulation efficiency compared to conventional Monte Carlo simulation is inversely proportional to the estimate.

关键词： Intelligent networks Telecommunication traffic Traffic control Asynchronous transfer mode Communication system traffic control Quality of service Switches Monte Carlo methods Bit rate Admission control

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Unsupervised model-based object recognition by parameter estimation of hierarchical mixtures

Unsupervised model-based object recognition by parameter est...

引用

IEEE International Conference on Image processing

作者： V. Kumar E.S. Manolakos Communications and Digital Signal Processing (CDSP) Center Electrical and Computer Engineering Department Northeastern University Boston MA USA

Model-based joint segmentation and recognition of objects is proposed in the framework of parameter estimation of hierarchical mixture densities. The maximum a posteriori (MAP) estimate of the parameters is computed by the application of a modified version of the expectation-maximization algorithm (EM with regularizing constraints applied to multiple level hierarchies). The approach is flexible in the sense that it allows for non-stationary pixel statistics, different noise models and is translation and scale invariant. Simulation results suggest that the scheme is well suited for recognition of partially occluded objects and recognition in complex and poorly modeled background.

关键词： Parameter estimation Image segmentation Labeling Application software signal processing algorithms Face detection Additive noise Parametric statistics Maximum likelihood estimation Digital signal processing

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Singularity processing of nonstationary signals

Singularity processing of nonstationary signals

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： A. Langi W. Kinsner Department of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba MAN Canada

This paper presents a new approach in processing nonstationary signals-such as speech signals and images-through singularity characterization. In this approach, we associate a singular measure /spl mu//sub f(t/) (r) with a transient at time t of a signal f(t) (where a real number r>0 is a time perturbation around t) and use the singularity behaviour of the measure for the characterization of the signal nonstationarity. The approach is capable of characterizing isolated transients through Holder exponents (or singularity strength), as well as mixture transients (e.g. singularity everywhere) through the concept of fractality and multifractality. The paper discusses the concept and the practicality of applying this approach to signals. The paper also shows that this approach can provide a unifying framework for previously published work on applying nonlinear, chaotic, fractal, and multifractal analysis to signals. We show that the main conceptual issue in applying fractality and multifractality to signals using this framework is the proper selection of signal measures.

关键词： signal processing Fractals signal analysis Speech analysis Chaos Image edge detection Image coding Speech recognition Image analysis Image texture analysis

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Disparity field and depth map coding for multiview image sequence compression

Disparity field and depth map coding for multiview image seq...

引用

IEEE International Conference on Image processing

作者： D. Tzovaras N. Grammalidis M.G. Strintzis Electrical and Computer Engineering Department Information Processing Laboratory Aristotle University of Thessaloniki Thessaloniki Greece

Methods are proposed for coding of the depth map and disparity fields for stereo or multiview image communication applications. Block-based and wireframe modeling techniques are examined for the coding of isolated depth map information and 2-D and 3-D motion compensation techniques for the coding of depth map sequences are evaluated.

关键词： Interpolation Image coding Cameras Optical receivers Optical transmitters Motion compensation Image communication Layout Image sequences Geometrical optics

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