Now showing items 221-240 of 268

  • Reducing dynamic power consumption in next generation DS-CDMA mobile communication receivers 

    Chandrasekhar, Vikram; Livingston, Frank; Cavallaro, Joseph R. (2008-09-01)
    Reduction of the power consumption in portable wireless receivers is important for cellular systems, including UMTS and IMT2000. This paper explores the architectural design-space and methodologies for reducing the dynamic ...
  • Reducing Peak-to-Average Power Ratio in OFDM Systems by adaptive dynamic range companding 

    Guo, Yuanbin; Cavallaro, Joseph R. (2002-05-01)
    One of the major drawbacks of OFDM systems is the notoriously high peak-to-average-power-ratio (PAPR). In this paper we study the performance of a novel PAPR reduction scheme proposed recently, namely Adaptive Dynamic ...
  • Resource Allocation in Wireless CDMA Multimedia Networks 

    Guo, Yile (1999-05-20)
    In this thesis we developed a resource allocation framework for wireless code division multiple access (CDMA) networks that support multi-class traffic with different data rates and bit error rate requirements. We proposed ...
  • Risk and Fault Tolerance Analysis for Robotics and Manufacturing 

    Hamilton, Deirdre L.; Cavallaro, Joseph R.; Walker, Ian D. (1996-05-01)
    This paper describes a novel method for analyzing, within one framework, several important types of risk associated with robotics and manufacturing applications. We will build on the established technique of Fault Tree ...
  • Robot Fault Detection and Fault Tolerance: A Survey 

    Visinsky, Monica L.; Cavallaro, Joseph R.; Walker, Ian D. (1994-01-01)
    Fault tolerance is increasingly important for robots, especially those in remote or hazardous environments. Robots need the ability to effectively detect and tolerate internal failures in order to continue performing their ...
  • Robot Reliability Estimation Using Interval Methods 

    Carreras, Carlos; Walker, Ian D.; Nieto, Octavio; Cavallaro, Joseph R. (1999-02-24)
    Reliability is a critical issue for many robotic applications, where failures can be disastrous. Traditional reliability analysis algorithms depend on the algebraic manipulation of given input data (representing subsystem ...
  • Robot Reliability Through Fuzzy Markov Models 

    Leuschen, Martin L.; Walker, Ian D.; Cavallaro, Joseph R. (1998-01-01)
    In the past few years, new applications of robots have increased the importance of robotic reliability and fault tolerance. Standard approaches of reliability engineering rely on the probability model, which is often ...
  • Robot Reliability Using Fuzzy Fault Trees and Markov Models 

    Leuschen, Martin L.; Walker, Ian D.; Cavallaro, Joseph R. (1996-11-01)
    Robot reliability has become an increasingly important issue in the last few years, in part due to the increased application of robots in hazardous and unstructured environments. However, much of this work leads to complex ...
  • Robotic Fault Detection Using Nonlinear Analytical Redundancy 

    Leuschen, Martin L.; Cavallaro, Joseph R.; Walker, Ian D. (2002-05-01)
    In this paper we discuss the application of our recently developed nonlinear analytical redundancy (NLAR) fault detection technique to a two-degree of freedom robot manipulator. NLAR extends the traditional linear AR ...
  • Robotic Fault Tolerance: Algorithms and Architectures 

    Visinsky, Monica L.; Cavallaro, Joseph R.; Walker, Ian D. (1993-04-01)
    Fault tolerance is an essential factor in ensuring successful autonomous systems, especially for robots working in remote or hazardous environments. To avoid the cost and risk involved in sending humans into these environs ...
  • Safety of Robotic Systems - Guest Editorial 

    Petersen, Kurt E.; Walker, Ian D.; Cavallaro, Joseph R. (1996-09-01)
    We were delighted to be invited by the editors of Reliability Engineering and System Safety to organise a special issue on the Safety of Robotic Systems. Robotic systems have now reached a level of sophistication far ...
  • Scalable and Low Power LDPC Decoder Design Using High Level Algorithmic Synthesis 

    Sun, Yang; Cavallaro, Joseph R.; Ly, Tai (2009-09-01)
    This paper presents a scalable and low power low-density parity-check (LDPC) decoder design for the next generation wireless handset SoC. The methodology is based on high level synthesis: PICO (program-in chip-out) tool ...
  • Scalable Architecture of MIMO Multi-carrier CDMA System on Programmable Logic 

    Guo, Yuanbin; Cavallaro, Joseph R. (2007-11-01)
    In this paper, a scalable architecture of the multicarrier CDMA system using Multiple-Input-Multiple-Output (MIMO) technology is designed in the programmable logic array. The system-level partitioning with different ...
  • Semi-Parallel Architectures For Real-time LDPC Coding 

    Karkooti, Marjan (2004-05-01)
    Error correcting codes (ECC) enable the communication systems to have a low-power, reliable transmission over noisy channels. ow Density Parity Check codes are the best known ECC code that can achieve data rates very close ...
  • Signal and Information Processing for Wireless Communication Systems 

    Bhashyam, Srikrishna (2001-04-20)
    Next generation wireless communication systems need to support access to multimedia data available on the internet. This universal wireless access to multimedia data requires data rates and quality of service that are ...
  • Simulation of Systolic Arrays On The Connection Machine 

    Hemkumar, Nariankadu D.; Cavallaro, Joseph R. (1993-09-20)
    The use of a programming model which extends naturally from the underlying hardware, greatly eases the design and implementation of simulators, especially for those systems that resemble the hardware in the paradigm of ...
  • Small-time scaling behaviors of Internet backbone traffic: An empirical study 

    Zhang, Zhi-Li; Ribeiro, Vinay Joseph; Moon, Sue; Diot, Christophe (2003-04-20)
    We study the small-time (sub-seconds) scaling behaviors of Internet backbone traffic, based on traces collected from OC3/12/48 links in a tier-1 ISP. We observe that for a majority of these traces, the (second-order) scaling ...
  • Soft Sphere Detection with Bounded Search for High-Throughput MIMO Receivers 

    Radosavljevic, Predrag; Cavallaro, Joseph R. (2006-11-01)
    We propose a soft sphere detection algorithm where search-bounds are determined based on the distribution of candidates found inside the sphere for different search levels. Detection accuracy of unbounded search is preserved ...
  • A Software Simulation Testbed for CDMA Wireless Communication Systems 

    Sundaramurthy, Vishwas (1999-05-20)
    This thesis develops a software wireless communication testbed which simulates a Code Division Multiple Access(CDMA) link. CDMA is a popular technology in cellular systems due to its superior capacity and performance. The ...
  • Spectral Optimization for Communication in the Presence of Crosstalk 

    Gaikwad, Rohit; Baraniuk, Richard G. (1999-03-01)
    This paper presents a general framework for designing optimal transmit spectra for communication services dominated by crosstalk --- for example Digital Subscriber Lines (DSLs) and wireless LANs. Using the channel, noise, ...