Now showing items 438-457 of 508

  • Task Partitioning Wireless Base-station Receiver Algorithms on Multiple DSPs and FPGAs 

    Rajagopal, Sridhar; Jones, Bryan Allen; Cavallaro, Joseph R. (2000-10-20)
    This paper presents a multiprocessor solution to meet real-time requirements of implementing advanced algorithms for multiuser channel estimation and detection for third and fourth generation wireless base-station receivers. ...
  • TCP-Africa: An Adaptive and Fair Rapid Increase Rule for Scalable TCP 

    King, Ryan; Baraniuk, Richard G.; Riedi, Rudolf H. (2005-03-01)
    High capacity data transfers over the Internet routinely fail to meet end-to-end performance expectations. The default transport control protocol for best effort data traffic is currently TCP, which does not scale well to ...
  • TEMPLAR: A Wavelet-Based Framework for Pattern Learning and Analysis 

    Scott, Clayton; Nowak, Robert David (2001-04-20)
    Despite the success of wavelet decompositions in other areas of statistical signal and image processing, current wavelet-based image models are inadequate for modeling patterns in images, due to the presence of unknown ...
  • Template Learning from Atomic Representations: A Wavelet-Based Approach to Pattern Analysis 

    Scott, Clayton; Nowak, Robert David (2001-04-20)
    Despite the success of wavelet decompositions in other areas of statistical signal and image processing, current wavelet-based image models are inadequate for modeling patterns in images, due to the presence of unknown ...
  • Tensor Product Basis Approximations for Volterra Filters 

    Nowak, Robert David; Van Veen, Barry D. (1996-02-01)
    This paper studies approximations for a class of nonlinear filters known as Volterra filters. Although the Volterra filter provides a relatively simple and general representation for nonlinear filtering, often it is highly ...
  • Terahertz Multistatic Reflection Imaging 

    Dorney, Timothy D.; Symes, William; Baraniuk, Richard G.; Mittleman, Daniel M. (2002-07-01)
    We describe a new imaging method using single-cycle pulses of terahertz (THz) radiation. This technique emulates the data collection and image processing procedures developed for geophysical prospecting and is made possible ...
  • Terahertz Reflection Imaging using Kirchhoff Migration 

    Dorney, Timothy D.; Johnson, Jon L.; Rudd, J. Van; Baraniuk, Richard G.; Symes, William; Mittleman, Daniel M. (2001-10-01)
    We describe a new imaging method that uses single-cycle pulses of terahertz (THz) radiation. This technique emulates data-collection and image-processing procedures developed for geophysical prospecting and is made possible ...
  • THE DESIGN OF DFT ALGORITHMS 

    JOHNSON, HOWARD WAYNE (1982)
    A broad class of efficient discrete Fourier transform algorithms is developed by partitioning short DFT algorithms into factors. The factored short DFT's are combined into longer DFT's using multidimensional index maps. ...
  • THE DISCRETE RADON TRANSFORM WITH APPLICATIONS TO TIME DOMAIN BEAMFORMING 

    SCHEIBNER, DAVID JAMES (1986)
    Performing a discrete Radon transform (DRT) with an array of space-time samples results in a function of slowness (inverse velocity) and time intercept. Time domain beamforming and semblance, two commonly used methods of ...
  • A Theoretical Analysis of Joint Manifolds 

    Davenport, Mark A.; Hegde, Chinmay; Duarte, Marco; Baraniuk, Richard G. (2009-01)
    The emergence of low-cost sensor architectures for diverse modalities has made it possible to deploy sensor arrays that capture a single event from a large number of vantage points and using multiple modalities. In many ...
  • Theory of Regular M-band Wavelet Bases 

    Steffen, P.; Heller, Peter Niels; Gopinath, Ramesh A.; Burrus, C. Sidney (1993-12-20)
    This paper constructs K-regular M-band orthonormal wavelet bases. K-regularity of the wavelet basis is known to be useful in numerical analysis applications and in image coding using wavelet techniques. Several characterizations ...
  • Throughput Maximization for ARQ-like Systems in Fading Channels with Coding and Queuing Delay Constraints 

    Ahmed, Nadeem; Baraniuk, Richard G. (2004-11-01)
    Practical delay-limited communication systems often employ retransmission algorithms such as ARQ to ensure reliable communications in fading channels. Maximizing the communications throughput in such systems can cause ...
  • Throughput Measures for Delay-constrained Communications in Fading Channels 

    Ahmed, Nadeem; Baraniuk, Richard G. (2003-10-01)
    Fading channels, often seen in wireless systems, provide an unfavorable environment for reliable communications. Current methods for evaluating the performance of fading channels include ergodic capacity and <i>epsilon</ ...
  • Time Frequency Analysis Applications in Geophysics 

    Steeghs, Philippe; Baraniuk, Richard G.; Odegard, Jan E. (2002-01-15)
    In this chapter, we overview a number of applications of time-frequency representations in seismic data processing, from the analysis of seismic sequences to efficient attribute extraction to 3-D attributes for volumetric data.
  • Time Frequency Detectors 

    Sayeed, Akbar M.; Jones, Douglas L. (1996-01-20)
    Time-frequency representations (TFRs) provide a powerful and flexible structure for designing optimal detectors in a variety of nonstationary scenarios. In this paper, we describe a TFR-based framework for optimal detection ...
  • Time Frequency Principal Components: Application to Speaker Identification 

    Magrin-Chagnolleau, Ivan; Durou, Geoffrey (1999-01-01)
    In this paper, we propose a formalism, called vector filtering of spectral trajectories, which allows to integrate under a common formalism a lot of speech parameterization approaches. We then propose a new filtering in ...
  • Time-Frequency Complexity and Information 

    Flandrin, Patrick; Baraniuk, Richard G.; Michel, Olivier (1994-04-01)
    Many functions have been proposed for estimating signal information content and complexity on the time-frequency plane, including moment-based measures such as the time-bandwidth product and the Shannon and Renyi entropies. ...
  • Time-frequency analysis of seismic sequences 

    Steeghs, Philippe; Drijkoningen, Guy G (1995-01-15)
    Reflection patterns play an important role in seismic sequence stratigraphy, therefore making their quantitative description essential for the construction and validation of sequence stratigraphic models from seismic data. ...
  • Time-Frequency Based Distance and Divergence Measures 

    Michel, Olivier; Baraniuk, Richard G. (1994-10-01)
    A study of the phase and amplitude sensitivity of the recently proposed Renyi time-frequency information measure leads to the introduction of a new "Jensen-like" divergence measure. While this quantity promises to be a ...