Now showing items 1212-1231 of 1784

    • Optimization Techniques for Minimizing Energy Consumption in Approximate Circuits 

      Muntimadugu, Kirthi Krishna (2011)
      This work presents different global and local optimization techniques for designing "approximate" circuits which decrease energy consumption, one of the most important criteria in present day circuit design. The concept ...
    • Optimized Message Passing Schedules for LDPC Decoding 

      Radosavljevic, Predrag; de Baynast, Alexandre; Cavallaro, Joseph R. (2005-11-01)
      The major drawback of the LDPC codes versus the turbo-codes is their comparative low convergence speed: 25-30 iterations vs. 8-10 iterations for turbo-codes. Recently, Hocevar showed by simulations that the convergence ...
    • Optimized Message Passing Schedules for LDPC Decoding 

      Radosavljevic, Predrag; de Baynast, Alexandre; Cavallaro, Joseph R. (2005-11-01)
      The major drawback of the LDPC codes versus the turbo-codes is their comparative low convergence speed: 25-30 iterations vs. 8-10 iterations for turbo-codes. Recently, Hocevar showed by simulations that the convergence ...
    • Optimizing binary decision systems by manipulating transmission intervals 

      Lexa, Michael; Johnson, Don (2003-07-20)
      We study the optimization of a binary decision system where quantized (soft) decisions are transmitted across an additive white Gaussian noise channel. We adjust the bit transmission intervals to maximize the Chernoff ...
    • Optimizing Physical Layer Data Transmission for Minimal Signal Distortion 

      Johnson, Don; Rodriguez-Diaz, Hiram (2003-04-20)
      When transmitting a sampled signal digitally, data and error correction bits must be transmitted at least as fast as the sampling rate. Typically, each bit is allocated the same transmission time interval, which means the ...
    • Optimum Quadratic Detection and Estimation Using Generalized Joint Signal Representations 

      Sayeed, Akbar M.; Jones, Douglas L. (1996-12-01)
      Time-frequency analysis has recently undergone significant advances in two main directions: statistically optimized methods that extend the scope of time-frequency-based techniques from merely exploratory data analysis to ...
    • Optoelectronic and Ultraviolet Plasmonics 

      Knight, Mark William (2014-04-07)
      Metallodielectric nanostructures are enabling a revolution in optics. For centuries optical techniques were constrained by the diffraction limit, which prevents the control over light at the nanoscale (~200 nm or less). ...
    • Origins and solutions of proportional unfairness in IEEE 802.11 multi-hop wireless networks 

      Shi, Jingpu (2008)
      Proportional unfairness exists in multi-hop wireless networks where IEEE 802.11 is employed as the medium access control protocol. Some flows may receive very high throughput while some others may receive very low or even ...
    • Origins of the Equivalent Circuit Concept 

      Johnson, Don (2003-04-20)
      The equivalent circuit concept derives from the Superposition Principle and Ohm's Law. Two forms of the equivalent circuit, the Thevenin equivalent and the Norton equivalent, distill any linear circuit into a source and ...
    • Orthogonal Hilbert Transform Filter Banks and Wavelets 

      van Spaendonck, Rutger; Blu, Thierry; Baraniuk, Richard G.; Vetterli, Martin (2003-04-01)
      Complex wavelet transforms offer the opportunity to perform directional and coherent processing based on the local magnitude and phase of signals and images. Although denoising, segmentation, and image enhancement are ...
    • Outage behaviour with delay and CSIT 

      Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2004-06-01)
      In this paper, we demonstrate that the packet outage probability for fading channels can be significantly reduced by exploiting queuing delay and transmitter channel information. Queuing delay gain is conceptually similar ...
    • Outage Minimization and Optimal Power Control for the Fading Relay Channel 

      Ahmed, Nasir; Khojastepour, Mohammad; Aazhang, Behnaam (2004-05-01)
      In this work, we show that in the wireless relay network, a tremendous savings in energy can be achieved by having side information at the transmitters and by employing power control. We present efficient protocols and the ...
    • Outage Minimization with Limited Feedback for the Fading Relay Channel 

      Ahmed, Nasir; Khojastepour, Mohammad; Sabharwal, Ashutosh; Aazhang, Behnaam (2006)
      In this work, we consider practical methods to approach the theoretical performance limits in the fading relay channel under different assumptions of transmitter channel knowledge. Specifically, we consider two degrees of ...
    • An Overview of the AT&T Spoken Document Retrieval System 

      Choi, John; Hindle, Don; Hirschberg, Julia; Magrin-Chagnolleau, Ivan; Nakatani, Christine; Pereira, Fernando; Singhal, Amit; Whittaker, Steve (1998-01-15)
      We present an overview of a spoken document retrieval system developed at AT&T Labs-Research for the HUB4 Broadcast News corpus. This overview includes a description of the intonational phrase boundary detection, ...
    • p-Efficient Estimators 

      Papantoni-Kazakos, P. (1975-08-20)
      This paper is concerned with estimates of an unknown vector parameter S based on observations X. A generalized error autocorrelation matrix with components the error moments of order 2p, is defined. A lower bound for ...
    • PACKET COMMUNICATION IN DELTA AND RELATED NETWORKS 

      DIAS, DANIEL MANUEL (1981)
      Delta networks are a class of multistage interconnection networks that can be used to interconnect a large number of modules in a modular computing system. In a packet communication environment, the modules in a system ...
    • Parallel algorithms and architectures for near-far resistant CDMA acquisition 

      Kota, Kishore (1996)
      Subspace-based algorithms are a class of algorithms for estimation problems in array signal processing and more recently near-far resistant Code Division Multiple Access (CDMA) acquisition problems. Subspace-based algorithms ...
    • Parallel Algorithms and Architectures for near-far resistant CDMA acquisition 

      Kota, Kishore (1996-05-20)
      Subspace-based algorithms are a class of algorithms for estimation problems in array signal processing and more recently near-far resistant Code Division Multiple Access (CDMA) acquisition problems. Subspace-based algorithms ...
    • Parallel algorithms and architectures for subspace based channel estimation for CDMA communication systems 

      Sengupta, Chaitali; Kota, Kishore; Cavallaro, Joseph R. (1996-08-20)
      This paper presents an overview and results from an ongoing research project to study parallel algorithms for the acquisition of Code Division Multiple Access (CDMA) communication signals. The goal of this research isto ...
    • A Parallel Graph Algorithm for Finding Connected Components 

      Hirschberg, D.S. (1975-10-20)
      A parallel program is presented that determines the connected components of an undirected graph in time 0(log<sup>2</sup>n) using n<sup>2</sup> processors. It is assumed that the processors have access to common memory. ...