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Proceedings of the 35th Asilomar Conference on signals, Systems & Computers

Proceedings of the 35th Asilomar Conference on Signals, Syst...

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35th Asilomar Conference on signals, Systems and Computers

This volume 2 of 2 of the conference proceedings contains 160 papers. Topics discussed include wireless communication and signal processing, algorithms for MIMO links, modulation and detection techniques, signal detection and classification, adaptive communications and arrays, image segmentation and frequency domain processing, multiple user/multiple access techniques, digital signal processing architectures, hyperspectral processing and multisignals or data fusion, computer arithmetic implementations and FPGA designs, radar and sonar processing, equalization and synchronization techniques, higher order statistical signal processing for communications, adaptive signal processing in communication, speech coding and processing, wireless systems, special arithmetic techniques, biomedical imaging and advanced modulation and channel estimation.

关键词： signal processing

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Pupil Phase Encoding for Multi-Aperture Imaging

Pupil Phase Encoding for Multi-Aperture Imaging

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Conference on advanced signal processing algorithms, architectures, and Implementantions XvIII

作者： Pauca, v. P. Chen, D. van der Gracht, J. Plemmons, R. J. Prasad, S. Torgersen, T. C. Wake Forest Univ Dept Comp Sci Winston Salem NC 27109 USA Wake Forest Univ Dept Math Winston Salem NC 27109 USA Holospex Inc Columbia MD 21044 USA Univ New Mexico Ctr Adv Studies Albuquerque NM 87131 USA Univ New Mexico Dept Phys & Astron Albuquerque NM 87131 USA

ISBN: (纸本)9780819472946

Digital super-resolution refers to computational techniques that exploit the generalized sampling theorem to extend image resolution beyond the pixel spacing of the detector, but not beyond the optical limit (Nyquist spatial frequency) of the lens. The approach to digital super-resolution taken by the PERIODIC multi-lenslet camera project is to solve a forward model which describes the effects of sub-pixel shifts, optical blur, and detector sampling as a product of matrix factors. The associated system matrix is often ill-conditioned, and convergence of iterative methods to solve for the high-resolution image may be slow. We investigate the use of pupil phase encoding in a multi-lenslet camera system as a means to physically precondition and regularize the computational super-resolution problem. This is an integrated optical-digital approach that has been previously demonstrated with cubic type and pseudo-random phase elements. Traditional multi-frame phase diversity for imaging through atmospheric turbulence uses a known smooth phase perturbation to help recover a time series of point spread functions corresponding to random phase errors. In the context of a multi-lenslet camera system, a known pseudo-random or cubic phase error may be used to help recover an array of unknown point spread functions corresponding to manufacturing and focus variations among the lenslets.

关键词： Imaging systems Point spread functions Super resolution Sensors Image resolution Cameras Computer programming Digital imaging Inverse optics Spatial resolution

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Gateway Diversity for Q/v Feeder Links: Requirements, Characteristics, and Challenges 7

Gateway Diversity for Q/V Feeder Links: Requirements, Charac...

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7th advanced Satellite Multimedia Systems Conference / 13th signal processing for Space Communications Workshop (ASMS/SPSC)

作者： Kyrgiazos, Argyrios Evans, Barry Univ Surrey Ctr Commun Syst Res Guildford GU2 7XH Surrey England

ISBN: (纸本)9781479958931

In this paper, we review the work of the gateway diversity schemes for Q/v band feeder links for a future HTS system. As each gateway will carry very high capacity, it is essential to ensure very high availabilities for the feeder links, typically greater than 99.9%. In order to do so, spatial diversity is required, since Adaptive Coding and Modulation (ACM) and Uplink Power Control (UPC) are unable to cope with the fade dynamics encountered at these high frequency bands. In an effort to reduce the total number of gateways in the system and to result in a more cost effective system, the concept of Smart gateways has emerged. We first review different architectures implementations and highlight their similarities and differences. We then outline the technological challenges and the issues that the envisaged solutions should consider during the design process. Finally we give views on a technology roadmap to meet these challenges.

关键词： Availability Frequency division multiplexing Logic gates Payloads Satellites Switches doorways Frequency division multiplexing Payload Logic gates satellites Switches Qv Gateways Adaptive coding NIH Roadmap Initiative tag Gateways spatial diversity

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Accurate characterization of error propagation in a highly parallel architecture

Accurate characterization of error propagation in a highly p...

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advanced signal processing algorithms, architectures, and implementations 1990

作者： Shamapant, v.R. Abraham, J.A. Saab, D.G. Computer Engineering Research Center University of Texas at Austin AustinTX78758 United States Center for Reliable and High Performance Computing University of Illinois at Urbana-Champaign UrbanaIL61801 United States

Errors caused by faults in a system manifest themselves in the output results in various patterns. These output patterns of erroneous data, the nature of their propagation through the various modules of the system and their impact on the system are collectively referred to as error characteristics. This paper deals with efficient methods of obtaining these error characteristics. Both experimental and analytical approaches to the problem are considered and a probabilistic approach to this problem is proposed. The effectiveness of this approach with respect to the accuracy of results and amount of computation involved is discussed. © 1990 SPIE. All rights reserved.

关键词： Parallel architectures

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CORDIC algorithms in four dimensions

CORDIC algorithms in four dimensions

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advanced signal-processing algorithms, architectures, and implementations

作者： Delosme, Jean-Marc Hsiao, Shen-Fu Yale Univ New Haven United States

CORDIC algorithms offer an attractive alternative to multiply-and-add based algorithms for the implementation of two-dimensional rotations, preserving either norm: (x2 + y2) 1/2 or (x2 - y2) 1/2 . Indeed these nor whose computation is a significant part of the evaluation of the two-dimensional rotations, are computed much more easily by the CORDIC algorithms. However the part played by norm computations in the evaluation of rotations becomes quickly small as the dimension of the space increases. Thus, in spaces of dimension 5 or more, there is no practical alternative to multiply-and-add based algorithms. In the intermediate region, dimensions 3 and 4, extensions of the CORDIC algorithms are an interesting option. The four-dimensional extensions are particularly elegant and are the main object of this paper.

关键词： signal processing

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Algorithm for the singular value decomposition of a matrix product

Algorithm for the singular value decomposition of a matrix p...

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advanced signal-processing algorithms, architectures, and implementations

作者： Bojanczyk, Adam W. Ewerbring, L.Magnus Luk, Franklin T. van Dooren, Paul Cornell Univ Ithaca United States

In this paper, we propose a new algorithm for computing a singular value decomposition of a matrix product. We show that our algorithm is numerically desirable in that all relevant residual elements will be numericall... 详细信息

关键词： signal processing

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High-resolution iris image reconstruction from low-resolution imagery

High-resolution iris image reconstruction from low-resolutio...

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Conference on advanced signal processing algorithms, architectures, and implementations XvI

作者： Barnard, R. Pauca, v. P. Torgersen, T. C. Plemmons, R. J. Prasad, S. van der Gracht, J. Nagy, J. Chung, J. Behrmann, G. Mathews, S. Mirotznik, M. Wake Forest Univ Dept Comp Sci Winston Salem NC 27109 USA Emory Univ Dept Math & Comp Sci Atlanta GA 30322 USA Wake Forest Univ Dept Math Winston Salem NC 27109 USA Holospex Inc Columbia MD 21044 USA EM Photon Inc Newark DE 19711 USA Catholic Univ Amer Dept Elect Engn & Comp Sci Washington DC 20064 USA Univ New Mexico Ctr Adv Studies Albuquerque NM 87131 USA Univ New Mexico Dept Phys & Astron Albuquerque NM 87131 USA

ISBN: (纸本)0819463922

We investigate the use of a novel multi-lens imaging system in the context of biometric identification, and more specifically, for iris recognition. Multi-lenslet cameras offer a number of significant advantages over standard single-lens camera systems, including thin form-factor and wide angle of view. By using appropriate lenslet spacing relative to the detector pixel pitch, the resulting ensemble of images implicitly contains subject information at higher spatial frequencies than those present in a single image. Additionally, a multi-lenslet approach enables the use of observational diversity, including phase, polarization, neutral density, and wavelength diversities. For example, post-processing multiple observations taken with differing neutral density filters yields an image having an extended dynamic range. Our research group has developed several multi-lens camera prototypes for the investigation of such diversities. In this paper, we present techniques for computing a high-resolution reconstructed image from an ensemble of low-resolution images containing sub-pixel level displacements. The quality of a reconstructed image is measured by computing the Hamming distance between the Daugman(4) iris code of a conventional reference iris image, and the iris code of a corresponding reconstructed image. We present numerical results concerning the effect of noise and defocus blur in the reconstruction process using simulated data and report preliminary work on the reconstruction of actual iris data obtained with our camera prototypes.

关键词： Cameras Iris recognition Image resolution Sensors Image registration Image quality Charge-coupled devices Imaging systems Prototyping Point spread functions

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Restoration of subpixel detail using the regularized pseudoinverse of the imaging operator

Restoration of subpixel detail using the regularized pseudoi...

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advanced signal processing algorithms, architectures, and implementations II

作者： Abbiss, John B. Brames, Bryan J. Spectron Development Labs. Inc. Costa Mesa CA USA

ISBN: (纸本)0819406945

We present an analysis and computational results relating to the regularized restoration of subpixel information from undersampled data. The method makes use of a small set of images in various stages of defocus. An iterative implementation permits the incorporation of a non- negativity constraint. The problem we consider is fundamentally under-determined, but useful results can be obtained in reasonably low noise conditions.

关键词： Image processing

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Cross-spectral methods with an application to speech processing

Cross-spectral methods with an application to speech process...

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Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Nelson, Douglas J. Wysocki, Wayne U.S. Dep of Defense Fort George G. Meade United States

We present a discussion of methods based on the complex cross-spectrum and the application of these methods to the analysis of speech. The cross spectral methods developed here are an extension of methods developed in the 1980's by one of the authors for accurately estimating stationary and cyclo-stationary parameters of signals buried deep in the noise. Since speech is non-stationary and therefore supports very little integration, the methods have been re-developed to address issues such as non-stationarity, harmonic structures and rapidly changing resonance Cross-spectral methods are presented as complex valued time-frequency surface methods which provide signal parameter estimation by taking advantage of signal structure. These methods have proven to be very powerful.

关键词： Speech analysis

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Collection and processing of acoustic and seismic array data for source localizaton

Collection and processing of acoustic and seismic array data...

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advanced signal processing algorithms, architectures, and implementations Xv

作者： Asgari, S. Stafsudd, J.Z. Chen, C.E. Ali, A. Hudson, R.E. Whang, D. Lorenzelli, F. Yao, K. Taciroglu, E. Electrical Engineering Department University of California Los Angeles CA United States Civil and Env. Engineering Department University of California Los Angeles CA United States

Distributed sensor networks have been proposed for a wide range of applications. In this paper, our goal is to locate a wideband source, generating both acoustic and seismic signals, using both seismic and acoustic sensors. For a far-field acoustic source, only the direction-of-arrival (DOA) in the coordinate system of the sensors is observable. We use the approximate Maximum-Likelihood (AML) method for DOA estimations from several acoustic arrays. For a seismic source, we use data collected at a single tri-axial accelerometer to perform DOA estimation. Two seismic DOA estimation methods, the eigen-decomposition of the sample covariance matrix method and the surface wave method are used. Field measurements of acoustic and seismic signals generated by vertically striking a heavy metal plate placed on the ground in an open field are collected. Each acoustic array uses four low-cost microphones placed in a square configuration and separated by one meter. The microphone outputs of each array are collected by a synchronized A/D recording system and processed locally based on the AML algorithm for DOA estimation. An array of six tri-axial accelerometers arranged in two rows whose outputs are fed into an ultra low power and high resolution network-aware seismic recording system. Field measured data from the acoustic and seismic arrays show the estimated DOAs and consequent localizations of the source are quite accurate and useful. Beamforming, Source localization,.

关键词： Acoustic arrays

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