Now showing items 1252-1271 of 1726

    • Platelets for Multiscale Analysis in Photon-Limited Imaging 

      Willett, Rebecca; Nowak, Robert David (2002-09-20)
      This paper proposes a new multiscale image decomposition based on platelets. Platelets are localized functions at various scales, locations, and orientations that produce piecewise linear image approximations. For smoothness ...
    • Platelets: A Multiscale Approach for Recovering Edges and Surfaces in Photon-Limited Medical Imaging 

      Willett, Rebecca; Nowak, Robert David (2003)
      This paper proposes a new multiscale image decomposition based on platelets. Platelets are localized functions at various scales, locations, and orientations that produce piecewise linear image approximations. Platelets ...
    • Polyimide-based field effect transistor structures 

      Steele, Jennifer Marie (1999)
      Because of the electrical insulating properties of polyimide, it is widely used in the packaging of semiconductor chips. However, it has been documented that the electrical resistivity can be decreased by several orders ...
    • Polynomial Root Finding 

      Lang, Markus; Frenzel, Bernhard-Christian (1994-10-01)
      Finding polynomial roots rapidly and accurately is an important problem in many areas of signal processing. We present a program which is superior in speed and accuracy to the best methods to our knowledge, i.e., Jenkins/Traub ...
    • Post-Compensation of RF Non-Linearity in Mobile OFDM Systems by Estimation of Memory-less Polynomial 

      Guo, Yuanbin; Cavallaro, Joseph R. (2002-05-01)
      The high peak-to-average-power-ratio (PAPR) of OFDM systems introduces inevitable non-linear distortion in the transmitter and causes both in-band distortion and out-of-band spectrum re-growth. In this paper we propose a ...
    • Power efficient broadcast scheduling with delay deadlines 

      Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2004-10-01)
      In this paper, we present a framework for the design of minimal power schedulers that satisfy average packet delay bounds for multiple users in a Gaussian wireless broadcast channel. We completely characterize the achievable ...
    • Power efficient transmission policies for multimedia traffic over wireless channels 

      Rajan, Dinesh (2002)
      The current and future wireless systems need to support a multitude of services with a wide range of data rates and reliability requirements. The limited battery resource at a mobile terminal coupled with the hostile ...
    • Power efficient transmission policies for multimedia traffic over wireless channels 

      Rajan, Dinesh (2002-04-20)
      The current and future wireless systems need to support a multitude of services with a wide range of data rates and reliability requirements. The limited battery resource at a mobile terminal coupled with the hostile ...
    • Power Issues in Communication Systems 

      Ahmed, Nasir (2002-04-20)
      In this work, we are concerned with power efficient communication techniques for wireless mobile devices. In this direction the effects of nonlinear amplifiers in communications systems are first studied, as they tend to ...
    • Power issues in communication systems 

      Ahmed, Nasir (2002)
      In this work, we are concerned with power efficient communication techniques for wireless mobile devices. In this direction the effects of nonlinear amplifiers in communications systems are first studied, as they tend to ...
    • Power Optimal Scheduling with Maximum Delay Constraints 

      Khojastepour, Mohammad; Sabharwal, Ashutosh (2003-10-01)
      Most multimedia sources are bursty in nature, a property which can be used to trade queuing delay with the resulting average transmission power [2, 3, 4]. In this paper, we study the relation between average transmission ...
    • Power optimization in multiple transmit antenna communication systems 

      Nallapureddy, Bhaskar Venkat-Vamsee (2004)
      We explore optimal ways of communicating (with a power constraint) over multiple antenna communication systems by managing spatial power distribution. We find that Mutual Coupling (MC), the interaction between antenna ...
    • Power-Efficient Non-coherent Space-Time Constellations 

      Borran, Mohammad Jaber; Sabharwal, Ashutosh; Aazhang, Behnaam (2003-07-20)
      We consider the problem of digital communication in a Rayleigh flat-fading environment using a multiple-antenna system, when the channel state information is available neither at the transmitter nor at the receiver. It ...
    • Ppb-level formaldehyde detection using a CW room-temperature interband cascade laser and a miniature dense pattern multipass gas cell 

      Dong, Lei; Yu, Yajun; Li, Chunguang; So, Stephen; Tittel, Frank K. (2015)
      A ppb-level formaldehyde (H2CO) sensor was developed using a thermoelectrically cooled (TEC), continuous-wave (CW) room temperature interband cascade laser (ICL) emitting at 3.59 μm and a miniature dense pattern multipass ...
    • A Pre-Clinical Framework for Neural Control of a Therapeutic Upper-Limb Exoskeleton 

      Blank, Amy; O'Malley, Marcia K.; Francisco, Gerard E.; Contreras-Vidal, Jose L. (2013)
      In this paper, we summarize a novel approach to robotic rehabilitation that capitalizes on the benefits of patient intent and real-time assessment of impairment. Specifically, an upper-limb, physical human-robot interface ...
    • Preamble-based Symbol Timing Estimation for Wireless OFDM Systems 

      Gadhiok, Manik; Cavallaro, Joseph R. (2007)
      We propose a timing estimation scheme that reduces computational complexity while achieving performance comparable to the autocorrelation method commonly employed at the wireless receiver. The proposed method is based ...
    • Preamble-based Symbol Timing Estimation for Wireless OFDM Systems 

      Gadhiok, Manik; Cavallaro, Joseph R. (2007-11-01)
      We propose a timing estimation scheme that reduces computational complexity while achieving performance comparable to the autocorrelation method commonly employed at the wireless receiver. The proposed method is based on ...
    • Principle and practice of optical code-division multiple access communication 

      Nguyen, Lim (1996)
      This research examines the theoretical and experimental aspects of code-division multiple access (CDMA) communication in the incoherent, or direct detection, optical domain. We develop new modulation and detection principles ...
    • Probabilistically Bounded Soft Sphere Detection for MIMO-OFDM Receivers: Algorithm and System Architecture 

      Radosavljevic, Predrag; Guo, Yuanbin; Cavallaro, Joseph R. (2009-10-01)
      Iterative soft detection and channel decoding for MIMO OFDM downlink receivers is studied in this work. Proposed inner soft sphere detection employs a variable upper bound for number of candidates per transmit antenna and ...
    • Process design and circuit model development 

      Rodriguez, Juan Antonio (1995)
      Process design for integrated circuit manufacturing has traditionally been implemented with little simulation prior to fabrication. As with circuit design of a decade ago, the available simulation tools were mainframe-based, ...