Now showing items 463-482 of 1050

  • Jacobi-like Matrix Factorizations with CORDIC-based Inexact Diagonalizations 

    Hemkumar, Nariankadu D.; Cavallaro, Joseph R. (1994-06-20)
    We propose a CORDIC-based Jacobi-like method for parallel computation of the eigenvalues of Hermitian (and real symmetric) matrices and the SVD of real matrices using inexact diagonalizations. It is predicted on the fact ...
  • Joint Compression and Speckle Reduction of SAR Images using Embedded Zerotree Models 

    Odegard, Jan E.; Guo, Haitao; Burrus, C. Sidney; Baraniuk, Richard G. (1996-03-01)
    We propose a new method for speckle reduction in synthetic aperture radar (SAR) imagery based on the embedded zerotree image compression algorithm. This new approach to denoising is inspired by the realization that the ...
  • Joint Detection Strategies for Orthogonal Frequency Division Multiplexing 

    Ahmed, Nadeem (2000-04-20)
    Traditional OFDM implementations use conventional Fourier filters for data modulation, via the IFFT operation. Much research suggests wavelet based OFDM provides performance gains, due to superior spectral containment ...
  • Joint Distributions for Arbitrary Variables 

    Cohen, Leon; Baraniuk, Richard G. (1994-10-01)
    We compare the methods of Cohen (1971) and of Baraniuk and Jones (see Proc. IEEE ICASSP-93, p.320-323, 1993) for obtaining joint distributions for arbitrary variables. We show that the two methods produce identical results ...
  • Joint Distributions of Arbitrary Variables Made Easy 

    Baraniuk, Richard G. (1996-09-01)
    The successful application of joint time-frequency distributions to problems in time-varying spectral analysis has stimulated considerable interest in distributions of other variables for use when a strict time-frequency ...
  • Joint Distributions of Arbitrary Variables Made Easy 

    Baraniuk, Richard G. (1998-10-01)
    In this paper, we propose a simple framework for studying certain distributions of variables beyond time-frequency and time-scale. When applicable, our results turn the theory of joint distributions of arbitrary variables ...
  • Joint Distributions of Arbitrary Variables Made Easy 

    Baraniuk, Richard G. (1998-09-01)
    The successful application of joint time-frequency distributions to problems in time-varying spectral analysis has stimulated considerable interest in distributions of other variables for use when a strict time-frequency ...
  • Joint multipath-Doppler diversity in fast fading channels 

    Sayeed, Akbar M.; Aazhang, Behnaam (1998-11-20)
    We present a new framework for code-division multiple access (CDMA) communication over fast fading mobile wireless channels. The performance of the RAKE receiver, which is at the heart of existing CDMA systems, degrades ...
  • Joint Multiuser Channel Estimation and Detection for CDMA Systems 

    Sengupta, Chaitali; Das, Suman; Cavallaro, Joseph R.; Aazhang, Behnaam (1999-02-20)
    We focus on the design of multiuser receiver structures for Code Division Multiple Access (CDMA) communication systems, in the presence of multipath effects and multiple sensors at the base station receiver. The joint ...
  • Joint signaling strategies for approaching the capacity of twisted-pair channels 

    Sendonaris, Andrew; Veeravalli, Venugopal V.; Aazhang, Behnaam (1998-10-20)
    A technique is presented for jointly optimizing the signaling in the two directions of transmission on a twisted-pair communications channel. It is then applied to twisted-pair channel models with monotonic channel response ...
  • Joint signaling techniques and spectral optimization for symmetric bit-rate communication over self-NEXT-dominated channels 

    Gaikwad, Rohit; Baraniuk, Richard G. (2004-07-01)
    We present a framework for maximizing the capacity of symmetric bit-rate communication services dominated by Gaussian crosstalk, in particular, digital subscriber line (DSL) services. We solve for optimal transmit power ...
  • Joint Signaling Techniques for Crosstalk-Dominated Communication Channels 

    Gaikwad, Rohit; Baraniuk, Richard G. (1999-12-01)
    We present a framework for maximizing the capacity (or bit rate) of symmetric bit rate communication services dominated by crosstalk, in particular digital subscriber line (DSL) services. We assume the DSL channel is a ...
  • Joint Source Channel Coding for Discrete Memoryless Channels 

    Bharadwaj, Vinay (2000-05-20)
    The design of optimal joint source/channel coding and decoding is examined for dis­ crete memoryless channels with end­to­end distortion as the criterion for reliable com­ munication. Joint source/channel encoders ...
  • JPEG Compression History Estimation for Color Images 

    Neelamani, Ramesh; de Queiroz, Ricardo; Fan, Zhigang; Baraniuk, Richard G. (2006-06-01)
    We routinely encounter digital color images that were previously compressed using the Joint Photographic Experts Group (JPEG) standard. En route to the image's current representation, the previous JPEG compression's various ...
  • JPEG Compression History Estimation for Color Images 

    Neelamani, Ramesh; de Queiroz, Ricardo; Fan, Zhigang; Baraniuk, Richard G. (2003-09-01)
    We routinely encounter digital color images that were previously JPEG-compressed. We aim to retrieve the various settings - termed JPEG compression history (CH) - employed during previous JPEG operations. This information ...
  • JPEG Compression History Estimation for Color Images 

    Neelamani, Ramesh; de Queiroz, Ricardo; Fan, Zhigang; Dash, Sanjeeb; Baraniuk, Richard G. (2005-07-01)
    We routinely encounter digital color images that were previously JPEG-compressed. En route to the image's current representation, the previous JPEG compression's various settings—termed its JPEG compression history ...
  • Keeping the Analog Genie in the Bottle: A Case for Digital Robots 

    Walker, Ian D.; Cavallaro, Joseph R.; Leuschen, Martin L. (1999-05-01)
    In this paper, we consider the case for adopting a truly 'digital' type of robot, which would evolve between a discrete and finite set of states. We adopt the point of view that the advantages of traditional robotic evolution ...
  • Laboratory Workstations in Electrical Engineering 

    Aneshansley, Daniel J.; Pottle, Christopher; Cavallaro, Joseph R. (1985-06-01)
    Computers, configured for data acquisition and control, have been used in undergraduate laboratories at Cornell University's School of Electrical Engineering since the early 1970s. The introduction of personal computers ...
  • Lattice Algorithms for Compression Color Space Estimation in JPEG Images 

    Neelamani, Ramesh; de Queiroz, Ricardo; Baraniuk, Richard G. (2001-08-01)
    JPEG (Joint Photographic Experts Group) is an international standard to compress and store digital color images [5]. Given a color image that was previously JPEG-compressed in some hidden color space, we aim to estimate ...
  • Layered Dynamic Fault Detection and Tolerance for Robots 

    Visinsky, Monica L.; Walker, Ian D.; Cavallaro, Joseph R. (1993-05-01)
    Fault tolerance is increasingly important for space and hazardous environment robotics. Robots need to quickly detect and tolerate internal failures in order to continue performing their tasks without the need for immediate ...