Now showing items 2194-2213 of 2256

    • 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 ...
    • Wafer-scale films of aligned single-wall carbon nanotubes: preparation, characterization, and optoelectronic applications 

      He, Xiaowei (2015-11-20)
      Single-wall carbon nanotubes (SWCNTs) are one-dimensional materials defined by a cylindrical and hollow structure with aspect ratios of up to 10^7:1. Individual SWCNTs have been shown to possess excellent electric, optical, ...
    • Wafer-scale monodomain films of spontaneously aligned single-walled carbon nanotubes 

      He, Xiaowei; Gao, Weilu; Xie, Lijuan; Li, Bo; Zhang, Qi; Lei, Sidong; Robinson, John M.; Hároz, Erik H.; Doorn, Stephen K.; Wang, Weipeng; Vajtai, Robert; Ajayan, Pulickel M.; Adams, W. Wade; Hauge, Robert H.; Kono, Junichiro (2016)
      The one-dimensional character of electrons, phonons and excitons in individual single-walled carbon nanotubes leads to extremely anisotropic electronic, thermal and optical properties. However, despite significant efforts ...
    • 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 ...
    • WARPnet: A platform for clean-slate deployed wireless networks 

      Gupta, Siddharth (2010)
      There has been a recent paradigm shift within the wireless communications academic community towards implementation-based algorithm validation. In the past, this task was left to industrial affiliates but in order to close ...
    • WATCH: Enabling WiFi in Active TV Channels 

      Zhang, Xu (2014-10-08)
      "White space” model allows TV channels that are not being used regionally by a TV broadcaster to be re-purposed for secondary access. Unfortunately, populated areas have few these unused channels. Nonetheless, Nielsen ...
    • 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. ...
    • Water-phase synthesis of cationic silica/polyamine nanoparticles 

      Nguyen, Quang Xuan Luong (2012)
      Functionalizing surfaces with amine groups through the hydrolytic condensation of aminotrialkoxysilanes is a typical approach when modifying silica particles for use in bioimaging, enzyme immobilization, and other applications. ...
    • 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. (1997)
      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 ...