Now showing items 238-257 of 268

  • Soft Sphere Detection with Bounded Search for High-Throughput MIMO Receivers 

    Radosavljevic, Predrag; Cavallaro, Joseph R. (IEEE, 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, ...
  • Structured Iterative and Circulant MIMO Chip Equalizer Architectures with FFT-acceleration for CDMA Systems 

    Guo, Yuanbin; McCain, Dennis; Cavallaro, Joseph R. (2005-07-01)
    In this paper, we propose a class of novel structured linear MMSE chip equalizer architectures for the MIMO CDMA systems using FFT-accelerations. First, a Conjugate Gradient (CG) algorithm is applied to avoid the Direct ...
  • Structured Parallel Architecture for Displacement MIMO Kalman Equalizer in CDMA Systems 

    Guo, Yuanbin; Zhang, Jianzhong; McCain, Dennis; Cavallaro, Joseph R. (IEEE, 2007-02-01)
    A reduced complexity MIMO Kalman equalizer architecture is proposed in this brief by jointly considering the displacement structure and the block-Toeplitz structure. Numerical matrix–matrix multiplications with O(F3) ...
  • Sub-quarter micron contact hole fabrication using annular illumination 

    Erdelyi, Miklos; Bor, Zsolt; Szabo, Gabor; Cavallaro, Joseph R.; Smayling, Michael C.; Tittel, Frank K.; Wilson, William L. (SPIE, 1996-03-01)
    Details of an experimental demonstration of a contact hole imaging system are reported in which the depth of focus is increased by a factor of about 3.5 using annular illumination. Due to spatial filtering and nonlinearity ...
  • Submicron Optical Lithography Based on a New Interferometric Phase Shifting Technique 

    Kido, Motoi; Szabo, Gabor; Cavallaro, Joseph R.; Wilson, William L.; Smayling, Michael C.; Tittel, Frank K. (Japanese Journal of Applied Physics, 1995-08-01)
    This paper reports the computer simulation and experimental demonstration of a new phase shifting technique based on interferometry that is especially suited for deep ultraviolet (UV) microlithography. Significant resolution ...
  • Submicron Optical Lithography Based on Interferometric Phase Shifting 

    Cavallaro, Joseph R.; Tittel, Frank K.; Wilson, William L. Jr. (SME Press, 1995-01-01)
    One of the most critical processing steps in the fabrication of integrated circuits is microlithography. The design of high density DRAMs requires the accurate patterning of submicron structures. The manufacturability of ...
  • A Survey of NASA and Military Standards on Fault Tolerance and Reliability Applied to Robotics 

    Cavallaro, Joseph R.; Walker, Ian D. (NASA, 1994-03-01)
    There is currently increasing interest and activity in the area of reliability and fault tolerance for robotics. This paper discusses the application of Standards in robot reliability, and surveys the literature of relevant ...
  • Task Partitioning Wireless Base-station Receiver Algorithms on Multiple DSPs and FPGAs 

    Rajagopal, Sridhar; Jones, Bryan Allen; Cavallaro, Joseph R. (2000-10-20)
    This paper presents a multiprocessor solution to meet real-time requirements of implementing advanced algorithms for multiuser channel estimation and detection for third and fourth generation wireless base-station receivers. ...
  • Testing on the Curve: Nonlinear Analytical Redundancy for Fault Detection 

    Leuschen, Martin L.; Cavallaro, Joseph R.; Walker, Ian D. (American Nuclear Society, 2001-03-01)
    One of the most important areas in the robotics industry is the development of robots capable of working in hazardous environments. Providing a high level of functionality in these arenas is important simply because humans ...
  • Time-Selective Signaling and Reception for Communication over Multipath Fading Channels 

    Bhashyam, Srikrishna; Sayeed, Akbar M.; Aazhang, Behnaam (2000-01-20)
    The mobile wireless channel affords inherent diversity to combat the effects of fading. Existing code division multiple access (CDMA) systems, by virtue of spread-spectrum signaling and RAKE reception, exploit only part ...
  • Toward an Improved Understanding of Network Traffic Dynamics 

    Riedi, Rudolf H.; Willinger, Walter (Wiley, 2000-01-15)
    Since the discovery of long range dependence in Ethernet LAN traces there has been significant progress in developing appropriate mathematical and statistical techniques that provide a physical-based, networking-related ...
  • Trellis-Search Based Soft-Input Soft-Output MIMO Detector: Algorithm and VLSI Architecture 

    Sun, Yang; Cavallaro, Joseph R. (IEEE, 2012-05-01)
    In this paper, we propose a trellis-search based soft-input soft-output detection algorithm and its very large scale integration (VLSI) architecture for iterative multiple-input multiple-output (MIMO) receivers. We construct ...
  • Truncated on-line arithmetic with applications to communication systems 

    Rajagopal, Sridhar; Cavallaro, Joseph R. (2006-09-01)
    Truncation and saturation in digit-precision are very important and common operations in embedded system design for bounding the required finite precision and for area-time-power savings. In this paper, we present the use ...
  • Truncated Online Arithmetic with Applications to Communication Systems 

    Rajagopal, Sridhar; Cavallaro, Joseph R. (IEEE, 2006-10)
    Truncation in digit-precision is a very important and common operation in embedded system design for bounding the required finite precision and for area-time-power savings. In this paper, we present the use of online ...
  • Ultrahigh Resolution Lithography with Excimer Lasers 

    Tittel, Frank K.; Erdelyi, Miklos; Sengupta, Chaitali; Bor, Zsolt; Szabo, Gabor; Cavallaro, Joseph R.; Smayling, Michael C.; Wilson, William L. (Kluwer Academic Publishers, 1995-07-01)
    The photolithography process is central to integrated circuit fabrication. Through this process an integrated circuit is patterned by imaging a photomask onto a layer of photoresist. The light source currently being used ...
  • UNIFIED DECODER ARCHITECTURE FOR LDPC/TURBO CODES 

    Sun, Yang; Cavallaro, Joseph R. (IEEE, 2008-10-01)
    Low-density parity-check (LDPC) codes on par with convolutional turbo codes (CTC) are two of the most powerful error correction codes known to perform very close to the Shannon limit. However, their different code structures ...
  • Untimed-C based SoC Architecture Design Space Exploration for 3G and Beyond Wireless Systems 

    Guo, Yuanbin; McCain, Dennis (2005-02-01)
    In this paper, we propose an un-timed C/C++ level verification methodology that integrates key technologies for truly high-level VLSI modelling to keep pace with the explosive complexity of SoC designs in the 3G and beyond ...
  • The Use of Fault Trees for the Design of Robots for Hazardous Environments 

    Walker, Ian D.; Cavallaro, Joseph R. (IEEE, 1996-01-01)
    This paper addresses the application of fault trees to the analysis of robot manipulator reliability and fault tolerance. Although a common and useful tool in other applications, fault trees have only recently been applied ...