Now showing items 1459-1478 of 1509

  • W-CDMA real-time algorithm implementation and evaluation 

    Jones, Bryan Allen (2000-05-20)
    This paper describes a platform to enable and explore the design and implementation of next-generation CDMA wireless base stations. A DSP and FPGA-based multiprocessor board is integrated into a Simulink-based wireless ...
  • WARP, a Modular Testbed for Configurable Wireless Network Research at Rice 

    Amiri, Kiarash; Sun, Yang; Murphy, Patrick; Hunter, Chris; Cavallaro, Joseph R.; Sabharwal, Ashutosh (2007-03-01)
    Wireless Open-Access Research Platform (WARP), developed at CMC lab, Rice University, provides a scalable and configurable platform for wireless network research. Its programmability and flexibility makes it easy to prototype ...
  • WARP, a UnifiedWireless Network Testbed for Education and Research 

    Amiri, Kiarash; Sun, Yang; Murphy, Patrick; Hunter, Chris; Cavallaro, Joseph R.; Sabharwal, Ashutosh (2007-06-01)
    In this paper, we introduce the Wireless Open-Access Research Platform (WARP) developed at CMC lab, Rice University. WARP provides a scalable and configurable platform mainly designed to prototype wireless communication ...
  • Warped Perspectives in Time Frequency Analysis 

    Baraniuk, Richard G. (1994-10-01)
    Unitary similarity transformations furnish a simple yet powerful vehicle for generating new classes of joint distributions based on concepts different from time, frequency, and scale. These new signal representations ...
  • Warped Wavelet Bases: Unitary Equivalence and Signal Processing 

    Baraniuk, Richard G.; Jones, Douglas L. (1993-04-01)
    The notions of time, frequency, and scale are generalized using concepts from unitary operator theory and applied to time-frequency analysis, in particular the wavelet and short-time Fourier transform orthonormal bases and ...
  • WATCH: WiFi in Active TV Channels 

    Zhang, Xu; Knightly, Edward W. (2015)
    Today's "white space" model of spectrum sharing applied in the UHF TV band allows channels that are not being used regionally by a TV broadcaster to be re-purposed for unlicensed-style secondary access in 24 hour increments. ...
  • WAVEFORM ANALYSIS USING DIGITAL TECHNIQUE 

    GOTTLIEB, ELIEZER (1967)
  • Wavelength encoding to reduce four-wave mixing crosstalk in multi-wavelength channels 

    Guo, Yuanbin; Aazhang, Behnaam; Young, James F. (1996-10-20)
    The trend toward higher bit rates in lightwave communications has increased interest in dispersion-shifted fiber (DSF) to minimize dispersion penalties. In addition, wavelength-division multiplexing (WDM) is being used to ...
  • Wavelength shift keying technique to reduce four-wave mixing crosstalk in WDM 

    Xiang, Chu (2000)
    In low dispersion fibers, the four-wave mixing (FWM) spectrum is symmetric with respect to the zero-dispersion wavelength. This thesis analyzes a wavelength shift keying (WSK) technique, a modification of the standard ...
  • Wavelet -Based Statistical Signal Processing using Hidden Markov Models 

    Crouse, Matthew; Nowak, Robert David; Baraniuk, Richard G. (1998-04-01)
    Wavelet-based statistical signal processing techniques such as denoising and detection typically model the wavelet coefficients as independent or jointly Gaussian. These models are unrealistic for many real-world signals. ...
  • Wavelet Analysis of Fractional Brownian Motion in Multifractal Time 

    Goncalves, Paulo; Riedi, Rudolf H. (1999-09-20)
    We study <i>fractional Brownian motions in multifractal time</i>, a model for multifractal processes proposed recently in the context of economics. Our interest focuses on the statistical properties of the wavelet decomposition ...
  • Wavelet Based SAR Speckle Reduction and Image Compression 

    Odegard, Jan E.; Guo, Haitao; Lang, Markus; Burrus, C. Sidney; Wells, R.O.; Novak, L.M.; Hiett, M. (1995-01-15)
    This paper evaluates the performance of the recently published wavelet based algorithm for speckle reduction of SAR images. The original algorithm, based on the theory of wavelet thresholding due to Donoho and Johnstone, ...
  • Wavelet Based SAR Speckle Reduction and Image Compression 

    Odegard, Jan E.; Guo, Haitao; Lang, Markus; Burrus, C. Sidney; Wells, R.O.; Novak, L.M.; Hiett, M. (1995-04-01)
    This paper evaluates the performance of the recently published wavelet based algorithm for speckle reduction of SAR images. The original algorithm, based on the theory of wavelet thresholding due to Donoho and Johnstone, ...
  • Wavelet Based Speckle Reduction with Applications to SAR based ATD/R 

    Guo, Haitao; Odegard, Jan E.; Lang, Markus; Gopinath, Ramesh A.; Selesnick, Ivan W.; Burrus, C. Sidney (1994-11-20)
    This paper introduces a novel speckle reduction method based on thresholding the wavelet coefficients of the logarithmically transformed image. The method is computational efficient and can sinificantly reduce the speckle ...
  • Wavelet Domain Filtering for Nuclear Medicine Imaging 

    Nowak, Robert David; Baraniuk, Richard G. (1996-11-01)
    The authors propose a new filtering/estimation method for nuclear medicine imaging. The statistical method of cross-validation is used to design optimal wavelet domain filters for improved image estimation. The quality of ...
  • Wavelet Folding and Decorrelation Across the Scale 

    Baraniuk, Richard G.; Wells, R.O.; Tian, Jun Feng (2000-06-01)
    The discrete wavelet transform (DWT) gives a compact multiscale representation of signals and provides a hierarchical structure for signal processing. It has been assumed the DWT can fairly well decorrelate real-world ...
  • Wavelet Shrinkage in Optical Flow Estimation 

    Tsang, Yolanda (2000-05-20)
    Optical Flow Computation is the estimation of 2D image motion, a projection of 3D motion onto its image plan. It uses a time-ordered image sequence to calculate the instantaneous velocities at image points. The image ...
  • Wavelet Soft-Thresholding of Time-Frequency Representations 

    Baraniuk, Richard G. (1994-11-01)
    The high noise sensitivity of the Wigner distribution makes smoothing a necessity for producing readable time-frequency images of noise corrupted signals. Since linear smoothing suppresses noise at the expense of considerable ...
  • Wavelet Statistical Models and Besov Spaces 

    Choi, Hyeokho; Baraniuk, Richard G. (2003-01-15)
    No Abstract
  • Wavelet-based deconvolution for ill-conditioned systems 

    Neelamani, Ramesh; Choi, Hyeokho; Baraniuk, Richard G. (2000-02-01)
    We propose a hybrid approach to wavelet-based deconvolution that comprises Fourier-domain system inversion followed by wavelet-domain noise suppression. In contrast to other wavelet-based deconvolution approaches, the ...