Now showing items 844-863 of 2368

    • GPU Accelerated Scalable Parallel Decoding of LDPC Codes 

      Wang, Guohui; Wu, Michael; Sun, Yang (2011-11-01)
      This paper proposes a flexible low-density parity-check (LDPC) decoder which leverages graphic processor units (GPU) to provide high decoding throughput. LDPC codes are widely adopted by the new emerging standards for ...
    • A GPU Implementation of a Real-Time MIMO Detector 

      Wu, Michael; Gupta, Siddharth; Sun, Yang; Cavallaro, Joseph R. (2009-10-01)
      Multiple-input multiple-output (MIMO) is an existing technique that can significantly increase throughput of the system by employing multiple antennas at the transmitter and the receiver. Realizing maximum benefit from ...
    • GPU-based Acceleration of Symbol Timng Recovery 

      Kim, Scott C.; Plishker, William L.; Bhattacharyya, Shurva S.; Cavallaro, Joseph R. (2012-12-20)
      This paper presents a novel implementation of graphics processing unit (GPU) based symbol timing recovery using polyphase interpolators to detect symbol timing error. Symbol timing recovery is a compute intensive procedure ...
    • A GPU-based preconditioned Newton-Krylov solver for flexible multibody dynamics 

      Serban, Radu; Melanz, Daniel; Li, Ang; Stanciulescu, Ilinca; Jayakumar, Paramsothy; Negrut, Dan (2015)
      This paper describes an approach to numerically approximate the time evolution of multibody systems with flexible (compliant) components. Its salient attribute is that at each time step, both the formulation of the system ...
    • GR-FET application for high-frequency detection device 

      Mahjoub, Akram M.; Nicol, Alec; Abe, Takuto; Ouchi, Takahiro; Iso, Yuhei; Kida, Michio; Aoki, Noboyuki; Miyamoto, Katsuhiko; Omatsu, Takashige; Bird, Jonathan P.; Ferry, David K.; Ishibashi, Koji; Ochiai, Yuichi (2013)
      A small forbidden gap matched to low-energy photons (meV) and a quasi-Dirac electron system are both definitive characteristics of bilayer graphene (GR) that has gained it considerable interest in realizing a broadly ...
    • Gradient Estimation for Sensitivity Analysis and Adaptive Multiuse Interface Rejection in Code-division Multiple-access Systems 

      Mandayam, Narayan B.; Aazhang, Behnaam (1997-07-20)
      In this paper, we consider a direct-sequence code-division multiple-access (DS-CDMA) system in the framework of a discrete-event dynamic system (DEDS) in order to optimize the system performance. Based on this formulation, ...
    • Gradient estimation for stochastic optimization of optical code-division multiple-access systems. II. Adaptive detection 

      Mandayam, Narayan B.; Aazhang, Behnaam (1997-05-20)
      For pt.I see ibid., vol.15, no.4, p.731-41 (1997). We develop infinitesimal perturbation analysis (IPA)-based stochastic gradient algorithms for deriving optimum detectors with the average probability of bit error being ...
    • Gradient Estimation for Stochastic Optimization of Optical Code-Division Multiple-Access Systems: Part I -- Generalized Sensitivity Analysis 

      Mandayam, Narayan B.; Aazhang, Behnaam (1997-05-20)
      For optimizing the performance of optical code-division multiple-access (CDMA) systems, there is a need for determining the sensitivity of the bit-error rate (BER) of the system to various system parameters. Asymptotic ...
    • Graphene Ambipolar Multiplier Phase Detector 

      Yang, Xuebei; Liu, Guanxiong; Rostami, Masoud; Balandin, Alexander A.; Mohanram, Kartik (2011-10)
      We report the experimental demonstration of a multiplier phase detector implemented with a single top-gated graphene transistor. Ambipolar current conduction in graphene transistors enables simplification of the design ...
    • Graphene as an atomically thin interface for growth of vertically aligned carbon nanotubes 

      Rao, Rahul; Chen, Gugang; Arava, Leela Mohana Reddy; Kalaga, Kaushik; Ishigami, Masahiro; Heinz, Tony F.; Ajayan, Pulickel M.; Harutyunyan, Avetik R. (2013)
      Growth of vertically aligned carbon nanotube (CNT) forests is highly sensitive to the nature of the substrate. This constraint narrows the range of available materials to just a few oxide-based dielectrics and presents a ...
    • Graphene Photonic Devices for Terahertz and Mid-Infrared 

      Gao, Weilu (2013-11-08)
      Graphene and other strictly two-dimensional materials are the rising stars on the horizon of material science, condensed matter physics and engineering. The richness of optical and electronic properties of graphene attract ...
    • Graphene–protein field effect biosensors: glucose sensing 

      Viswanathan, Sowmya; Narayanan, Tharangattu N.; Aran, Kiana; Fink, Kathryn D.; Paredes, Jacobo; Ajayan, Pulickel M.; Filipek, Slawomir; Miszta, Przemyslaw; Tekin, H. Cumhur; Inci, Fatih; Demirci, Utkan; Li, Pingzuo; Bolotin, Kirill I.; Liepmann, Dorian; Renugopalakrishanan, V. (2015)
      Chronic diseases are becoming more prevalent, and the complexities of managing patients continue to escalate, since their care must be balanced between the home and clinical settings. Diabetes is the most advanced example, ...
    • Graphical Models via Univariate Exponential Family Distributions 

      Yang, Eunho; Ravikumar, Pradeep; Allen, Genevera I.; Liu, Zhandong (2015)
      Undirected graphical models, or Markov networks, are a popular class of statistical models, used in a wide variety of applications. Popular instances of this class include Gaussian graphical models and Ising models. In ...
    • Half-Duplex Estimate-and-Forward Relaying: Bounds and Code Design 

      Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2006-07-01)
      We propose a coding scheme for half-duplex estimate-and-forward relaying. Our first contribution is to present an achievable rate for the estimate-and-forward protocol. We also derive the achievable rate for the special ...
    • Half-Duplex Estimate-and-Forward Relaying:Bounds and Code Design 

      Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2006-01-01)
      We propose a coding scheme for half-duplex estimate-and-forward relaying. Our first contribution is to present an achievable rate for the estimate-and-forward protocol. We also derive the achievable rate for the special ...
    • Hall and field-effect mobilities in few layeredᅠp-WSe2ᅠfield-effect transistors 

      Pradhan, N.R.; Rhodes, D.; Memaran, S.; Poumirol, J.M.; Smirnov, D.; Talapatra, S.; Feng, S.; Perea-Lopez, N.; Elias, A.L.; Terrones, M.; Ajayan, P.M.; Balicas, L. (2015)
      Here, we present a temperature (T) dependent comparison between field-effect and Hall mobilities in field-effect transistors based on few-layered WSe2 exfoliated onto SiO2. Without dielectric engineering and beyond a ...
    • Handset Algorithms & Architectures for Blind Channel Estimation & Detection 

      Livingston, Frank (2000-05-20)
      Multiple access is an important consideration in the design and implementation of wireless communications systems. Code division multiple access (CDMA) is one method for providing multiple access in a wireless system. In ...
    • Handset Detector Architectures for DS-CDMA Wireless Systems 

      Livingston, Frank; Chandrasekhar, Vikram; Vaya, Mani; Cavallaro, Joseph R. (2002-05-20)
      This paper investigates detector architectures for wireless handsets employing DS-CDMA. The code-matched filter (MF) and minimum output energy (MOE) detectors are analyzed with respect to fixed-point arithmetic behavior. ...
    • Hardware design issues for a mobile unit for next generation CDMA systems 

      Das, Suman; Sengupta, Chaitali; Cavallaro, Joseph R. (1998-07-20)
      This paper addresses hardware design issues of a mobile receiver for future generation direct sequence CDMA wireless communication systems. In the design of a mobile unit, fixed-point hardware is an attractive alternative ...