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New blind beamforming algorithm using joint multiple matrix diagonalization

New blind beamforming algorithm using joint multiple matrix ...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Hsiao-Chun Wu Xiaozhou Huang Communications and Signal Processing Laboratory Electrical and Computer Engineering Department Louisiana State University Baton Rouge LA USA

We propose a new joint multiple matrix diagonalization algorithm for robust blind beamforming. This new algorithm is based on the iterative eigen-decomposition of cumulant matrices. Therefore it can avoid the stability and misadjustment problems arising among the conventional steepest-descent approaches for constant-modulus or cumulant optimization. Our Monte Carlo simulations show that our proposed algorithm significantly outperforms the JADE algorithm based on the Givens rotation for PSK source signals in terms of signal-to-interference-and-noise ratio for a wide variety of signal-to-noise ratios

关键词： Array signal processing signal processing algorithms Iterative algorithms Vectors Antenna arrays Antennas and propagation Blind equalizers Linear antenna arrays Robustness Stability

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Fast channel estimation using maximum-length shift-register sequences

Fast channel estimation using maximum-length shift-register ...

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IEEE Conference on Vehicular Technology (VTC)

作者： Songnan Xi Hsiao-Chun Wu Communications and Signal Processing Laboratory Department of Electrical and Computer Engineering Louisiana State University Baton Rouge LA USA

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Data-Hiding Codes

Data-Hiding Codes

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作者： Moulin, Pierre Koetter, Ralf IEEE United States University of Illinois Urbana IL 61801 United States Department of Electrical and Computer Engineering United States Beckman Institute Coordinated Science Laboratory United States Department of Statistics United States Board of Governors IEEE Signal Processing Society United States Coordinated Science Laboratory United States

This tutorial paper reviews the theory and design of codes for hiding or embedding information in signals such as images, video, audio, graphics, and text. Such codes have also been called watermarking codes;they can be used in a variety of applications, including copyright protection for digital media, content authentication, media forensics, data binding, and covert communications. Some of these applications imply the presence of an adversary attempting to disrupt the transmission of information to the receiver;other applications involve a noisy, generally unknown, communication channel. Our focus is on the mathematical models, fundamental principles, and code design techniques that are applicable to data hiding. The approach draws from basic concepts in information theory, coding theory, game theory, and signal processing, and is illustrated with applications to the problem of hiding data in images. © 2005 IEEE.

关键词： Codes (symbols)

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Street tracking based on SAR data from Urban areas

Street tracking based on SAR data from Urban areas

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2005 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2005

作者： Sigurjonsson, Sigurjon Orn Benediktsson, Jon Atli Sveinsson, Johannes R. Lisini, Gianni Gamba, Paolo Chanussot, Jocelyn Department of Electrical and Computer Engineering University of Iceland Hjardarhaga 2-6 107 Reykjavik Iceland Department of Electronics University of Pavia Via Ferrata 1 27100 Pavia Italy Signal and Images Laboratory LIS/INGP BP 46 38402 St. Martin d'Heres France

ISBN: (纸本)0780390504

A method for street tracking is proposed. The method consists of two steps. First, a "blob image" of possible street candidates is created. Then, the street segments from that blob image are extracted. Two feature extraction approaches based on mathematical morphology are applied as preprocessing for the street tracking. One method is based on using differential morphological profiles but the other uses morphological opening and closing operators with a rotating structuring element (SE). The method is tested on an AIRSAR image from Los Angeles with and without noise filtering. The obtained results are measured using two indexes;correctness and completeness. Of the two methods used in the feature extraction, the SE rotation appears to give better results. Noise filtering does not have a major effect in street tracking for the AIRSAR image. © 2005 IEEE.

关键词： Synthetic aperture radar

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OFDM performance analysis in the presence of synchronization errors induced by hot carriers

OFDM performance analysis in the presence of synchronization...

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IEEE Conference on Vehicular Technology (VTC)

作者： S.R. Herlekar Hsiao-Chun Wu Chi Zhang A. Srivastava Communications and Signal Processing Laboratory and VLSI Circuit Design Laboratory Department of Electrical & Computer Engineering Louisiana State University Baton Rouge LA USA

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Extracting the Optic Disk Endpoints in Optical Coherence Tomography Data

Extracting the Optic Disk Endpoints in Optical Coherence Tom...

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IEEE Workshop on Applications of computer Vision (WACV)

作者： Artemas Herzog Kim L. Boyer Cynthia Roberts Department of Electrical and Computer Engineering Signal Analysis and Machine Perception Laboratory Ohio State Uinversity USA Department of Ophthalmology Department of Biomedical Engineering Ohio State Uinversity USA

Optical coherence tomography (OCT) uses backreflected light to provide micron-resolution, cross-sectional scans of biological tissues useful in diagnosing, monitoring, and studying glaucoma. The ratio of the area of the central portion of the optic nerve (the cup) to that of the complete nerve (the disk) is an indicator of ocular health. Measuring this cup-to-disk ratio accurately requires precise detection of the cup and disk limits in scans traversing the optic nervehead. A hybrid edge-supported boundary detector first finds the contour separating the retina and optic nervehead (on one side) from the vitreous humor on the other. We then partition this boundary using a model-based technique to identify the optic cup. The lower retinal-choroid boundaries are extracted using Markov models first derived by Koozekanani et al.. The endpoints of these lower boundaries represent the limits of the optic disk. Points along the Markov path are then represented in a feature space comprising two low order unitary transform coefficients and a measure of differential edge strength. By minimizing the trace of the within-class scatter matrices for optic nerve and retina, optimal estimates of the nervehead extent are found. We present thorough experimental results to establish the stability and robustness of the technique, as well as its performance limitations.

关键词： Data mining Tomography Optical scattering Biomedical optical imaging Retina Robust stability Biological tissues Monitoring Extraterrestrial measurements Light scattering

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Characterization of a cascade LMS predictor

Characterization of a cascade LMS predictor

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International Conference on Acoustics, Speech, and signal Processing (ICASSP)

作者： D.Y. Huang X. Su A. Nallanathan Multimedia Signal Processing Laboratory/Media Division Institute for Infocomm Research Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore

An FIR cascade structure for adaptive linear prediction is studied in which each stage FIR filter is independently adapted using an LMS algorithm. Theoretical analysis shows that the cascade performs a linear prediction in a way of successive refinement and each stage tries to obliterate the dominant mode of its input. Experimental results show that the performance of the cascade LMS predictor are in good agreement with our theoretical analysis.

关键词： Least squares approximation Finite impulse response filter Convergence Performance analysis signal analysis Adaptive signal processing Laboratories signal processing algorithms Speech coding Video coding

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Classification of hyperspectral data from urban areas using morphological preprocessing and independent component analysis

Classification of hyperspectral data from urban areas using ...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： J.A. Palmason J.A. Benediktsson J.R. Sveinsson J. Chanussot Department of Electrical and Computer Engineering University of Iceland Reykjavik Iceland Signal & Images Laboratory LIS INPG Saint Martin d'Heres France

Classification of high-resolution hyperspectral data is investigated. Previously, in classification of high-resolution panchromatic data, simple morphological profiles have been constructed with a repeated use of morphological opening and closing operators with a structuring element of increasing size, starting with the original panchromatic image. This approach has recently been extended for hyperspectral data. In the extension, principal components of the hyperspectral imagery have been computed in order to produce an extended morphological profile. In this paper, we investigate the use of independent components instead of principal components in extended morphological profiles, i.e., selected independent components are used as base images for an extended morphological profile. In the proposed approach, the extended morphological profiles based on the independent components are used as inputs to a neural network classifier. In experiments, a hyperspectral data sets from an urban area in Pavia, Italy is classified.

关键词： Hyperspectral imaging Urban areas Independent component analysis Hyperspectral sensors Spatial resolution Principal component analysis Morphology Electronic mail Neural networks Remote sensing

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FPGA implementation for channel estimations based on Wiener LMS for DS-CDMA

FPGA implementation for channel estimations based on Wiener ...

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IEEE Workshop on signal Processing Systems (SIPS)

作者： M. Elnamaky M. Ahmed-Ouameur D. Massicotte Laboratory of Signal and System Integration Department of Electrical and Computer Engineering Université du Québec à Trois Rivières Trois-rivieres QUE Canada

The estimation of channel delays along with their respective complex channel coefficients of different users constitutes the first stage in the detection process at the receiving base station in a DS-CDMA communication system. A multiuser steepest Wiener LMS (MS-WLMS) like structure algorithm along with smoothing/prediction filters to improve tracking quality is suggested. This paper presents a customized and fixed-point hardware parallel implementation of the proposed algorithm for WCDMA uplink transmission in third generation (3G) wireless system. Additional speedup in the execution time is achieved over the well known maximum likelihood channel estimation for DS-CDMA. It is also shown that our solution could achieve the real-time requirements of 3GPP standards applied in WCDMA systems.

关键词： Field programmable gate arrays Channel estimation Least squares approximation Multiaccess communication Delay estimation Base stations Smoothing methods Filters Hardware Maximum likelihood detection

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Effective memory reduction scheme used for reference frames in H.264/AVC video codec

Effective memory reduction scheme used for reference frames ...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Chih-Chang Chen Sheng-Shiung Chen O.T.C. Chen Chien-Fa Chen Fang-Chu Chen Department of Electrical Engineering Signal and Media Laboratories National Chung Cheng University Taiwan Digital Signal Processing Tech. Department of Computer & Communications Research Laboratory Industrial Technology and Research Institute Taiwan

In the H.264/AVC video codec, multiple reference frames are applied for motion estimation to provide good coding efficiency. However, multiple reference frames also require more memory cost than one reference frame used in a video codec. To minimize the amount of memory requirement, this work proposes to add a decision unit in the H.264/AVC codec to store these reference frames. The said decision unit would look closely at macroblock (MB) of the currently decoded frame to determine it's storage type to be compressed or reconstructed data, according to the encoding parameters of subblocks in this MB. Furthermore, an adaptive scheme is proposed to store the currently decoded frame as reconstructed picture for lowering the computational complexity and using the buffer in full. Experimental results reveal that the proposed memory reduction scheme requires lower complexity and better picture quality than the conventional work. Therefore, the proposed memory reduction scheme can be widely used in various applications of the H.264/AVC codec to minimize the memory requirement.

关键词： Automatic voltage control Video codecs Decoding Buffer storage Motion estimation Costs Computational complexity Videoconference Video compression Encoding

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