Browsing DSP Publications by Title
Now showing items 380399 of 508

A RadiallyGaussian, SignalDependent TimeFrequency Representation
(19910401)An optimization formulation for designing signaldependent kernels that are based on radially Gaussian functions is presented. The method is based on optimality criteria and is not ad hoc. The procedure is automatic. The ... 
Random Filters for Compressive Sampling and Reconstruction
(20060501)We propose and study a new technique for efficiently acquiring and reconstructing signals based on convolution with a fixed FIR filter having random taps. The method is designed for sparse and compressible signals, i.e., ... 
Random Projections of Signal Manifolds
(20060501)Random projections have recently found a surprising niche in signal processing. The key revelation is that the relevant structure in a signal can be preserved when that signal is projected onto a small number of random ... 
Random Projections of Smooth Manifolds
(20061001)Many types of data and information can be described by concise models that suggest each data vector (or signal) actually has â few degrees of freedomâ relative to its size N. This is the motivation for a variety of ... 
Rapid Prototyping of Wireless Communications Systems
(20020520)This thesis introduces rapid prototyping methodology which overcomes important barriers in the design and implementation of digital signal processing (DSP) algorithms and systems on embedded hardware platforms, such as ... 
Rateconstrained Relaying: A Model for Cooperation with Limited Relay Resources
(20050601)In this paper, the impact of limited resources on achievable rates in relay channels is investigated. Resource limitation is modeled as a rate constraint, Rbar, which constrains the rate at which a relay can reliably ... 
RateDistortion Optimized Image Compression using Wedgelets
(20020601)Most waveletbased image coders fail to model the joint coherent behavior of wavelet coefficients near edges. Wedgelets offer a convenient parameterization for the edges in an image, but they have yet to yield a viable ... 
RealTime Algorithms and Architectures for Multiuser Channel Estimation and Detection in Wireless BaseStation Receivers
(20020720)This paper presents alogrithms and architecture designs that can meet realtime requirements of multiuser channel estimation and detection in future wireless basestation receivers. Sophisticated algorithms proposed to ... 
RealTime DSP Multiprocessor Implementation for Future Wireless BaseStation Receivers
(20000820)The convergence of cellular phones, the Internet, and laptop computers into a single small, lightweight, wireless information appliance drives a need for a high data rate, lowpower digital wireless communication link to ... 
Recent advances in Imaging and Spectroscopy with Trays
(19981201)Recent work in terahertz "TRay" imaging is reported. With the ongoing development of commercially viable THzTDS imaging system, opitmail signal processing strategies for the THz waveforms must be developed. Algorithms ... 
Recent Advances in Terahertz Imaging
(19990601)We review recent progress in the field of terahertz "Tray" imaging. This relatively new imaging technique, based on terahertz timedomain spectroscopy, has the potential to be the first portable farinfared imagin ... 
RECONSTRUCTION OF SIGNALS FROM PHASE: EFFICIENT ALGORITHMS, SEGMENTATION, AND GENERALIZATIONS
(1982)It is well known that the phase of the Fourier transform of a signal contains a significant amount of information about the signal. Under certain circumstances the knowledge of phase is sufficient to recover the original ... 
A recursive algorithm for digital Image Processing using Local Statistics
(19790620)An algorithm is presented for digital image processing based on local statistics. The algorithm constitutes a recursive implementaiton of an approach proposed and implemented nonrecursively by J.S. Lee (Naval Research ... 
Regression level set estimation via costsensitive classification
(20070601)Regression level set estimation is an important yet understudied learning task. It lies somewhere between regression function estimation and traditional binary classification, and in many cases is a more appropriate setting ... 
Remembering John Napier and His Logarithms
(20020520)This article describes John Napier's original defintion of logarithms and presents his method of tabulation for the first logarithmic table. Napier's logarithms are found to have an intimate relationship with the natural ... 
Representation and Compression of MultiDimensional Piecewise Functions Using Surflets
(20060301)We study the representation, approximation, and compression of functions in M dimensions that consist of constant or smooth regions separated by smooth (M1)dimensional discontinuities. Examples include images containing ... 
Robust Distributed Estimation in Sensor Networks using the Embedded Polygons Algorithm
(20040401)We propose a new iterative distributed algorithm for linear minimum meansquarederror (LMMSE) estimation in sensor networks whose measurements follow a Gaussian hidden Markov graphical model with cycles. The <i>embedded ... 
Robust Distributed Estimation Using the Embedded Subgraphs Algorithm
(20060801)We propose a new iterative, distributed approach for linear minimum meansquareerror (LMMSE) estimation in graphical models with cycles. The embedded subgraphs algorithm (ESA) decomposes a loopy graphical model into a ... 
SCAN  Speech Content Based Audio Navigator: A Systems Overview
(19980115)SCAN (Speech Content based Audio Navigator) is a spoken document retrieval system integrating speakerindependent, largevocabulary speech recognition with informationretrieval to support querybased retrieval of information ... 
SecondOrder Statistical Measures for TextIndependent Speaker Identification
(19950820)This article presents an overview of several measures for speaker recognition. These measures relate to secondorder statistical tests, and can be expressed under a common formalism. Alternate formulations of these measures ...