Now showing items 40-59 of 268

  • Design and Analysis of Heterogeneous DSP/FPGA Based Architectures for 3GPP Wireless Systems 

    Brogioli, Michael C.; Gadhiok, Manik; Cavallaro, Joseph R. (2006-04-01)
    This paper shows how iterative hardware/software partitioning in heterogeneous DSP/FPGA based embedded systems can be utilized to achieve real-time deadlines of modern 3GPP wireless equalization workloads. By utilizing a ...
  • Design and Architecture of Spatial Multiplexing MIMO Decoders for FPGAs 

    Dick, Chris; Amiri, Kiarash; Cavallaro, Joseph R.; Rao, Raghu (2008-10-01)
    Spatial multiplexing multiple-input-multiple-output (MIMO) communication systems have recently drawn significant attention as a means to achieve tremendous gains in wireless system capacity and link reliability. The optimal ...
  • Design space exploration for real-time embedded stream processors 

    Rajagopal, Sridhar; Cavallaro, Joseph R.; Rixner, Scott (2004-07-01)
    We present a design framework for rapidly exploring the design space for stream processors in real-time embedded systems. Stream processors enable hundreds of arithmetic units in programmable pro-cessors by using clusters ...
  • Development of Digital Signal Processor controlled Quantum Cascade Laser based Trace Gas Sensor Technology 

    So, Stephen; Wysocki, Gerard; Frantz, Patrick; Tittel, Frank K. (2006-08-01)
    This work reports the design and integration of a custom digital signal processor (DSP) system into a pulsed quantum cascade laser (QCL) based trace gas sensor to improve its portability, robustness and operating performance. ...
  • Development of Japanese-language DSP Education Content in the Connexions Project 

    Frantz, Patrick; Yamada, Yoji (2005-10-01)
    Due to factors such as a small and fragmented market and rapid hardware development, the conventional textbook is inadequate for DSP lab education. Freely available open-content materials that enable and promote local ...
  • Displacement MIMO Kalman equalizer architecture for CDMA downlink in fast fading channels 

    Guo, Yuanbin; Zhang, Jianzhong (Charlie); McCain, Dennis; Cavallaro, Joseph R. (2005-07-01)
    In this paper, we explore the displacement structure in a Kalman equalizer for MIMO-CDMA downlink. A streamlined MIMO Kalman equalizer architecture is proposed to extract the commonality in the data path by exploiting the ...
  • Displacement MIMO Kalman Equalizer for CDMA Downlink in Fast Fading Channels 

    Guo, Yuanbin; Zhang, Jianzhong (Charlie); McCain, Dennis; Cavallaro, Joseph R. (2005-11-01)
    In this paper, a streamlined MIMO Kalman equalizer architecture is proposed to extract the commonality in the data path by jointly considering the displacement structure of the transition matrix and the block-Toeplitz ...
  • Distributed Cooperative Communications in Wireless Networks 

    Khojastepour, Mohammad (2005-01-01)
    The primary challenge in communication over wireless networks, unlike wireline networks, is the existence of interference and channel variations (fading). Having more users at higher data rates means that current ...
  • Distributed Decoding in Cooperative Communications 

    Karkooti, Marjan; Cavallaro, Joseph R. (2007-11-01)
    In this paper, we present a novel relaying strategy called distributed and partial decoding. This strategy can be viewed as a variation of the decode and forward with the difference that the relay partially decodes the ...
  • DSP Education At Rice University 

    Frantz, Patrick; Choi, Hyeokho; Baraniuk, Richard G. (2003-09-01)
    Rice University has a decades-long tradition of both digital signal processing (DSP) research and education, beginning in 1968. Since that time, Rice University has become a world leader and continued to be a pioneer in ...
  • A DSP-Based Platform for Wireless Video Compression 

    Murphy, Patrick; Bharadwaj, Vinay; Welsh, Erik; Frantz, Patrick (2002-11-01)
    With the exponential growth of wireless voice markets, demand for wireless video services is soon to follow. However, bandwidth limited wireless channels coupled with mobility issues pose a great challenge in the hardware, ...
  • Dynamic Fault Reconfigurable Intelligent Control Architectures for Robotics 

    Cavallaro, Joseph R.; Walker, Ian D. (1993-04-01)
    In this paper we describe new progress in our development of an Intelligent Control Framework for robots which dynamically reconfigures itself to cope with faults in either sensors or joint hardware. The Framework is ...
  • A Dynamic Fault Tolerance Framework for Remote Robots 

    Visinsky, Monica L.; Cavallaro, Joseph R.; Walker, Ian D. (1995-08-01)
    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 ...
  • Dynamic Senor-Based Fault Detection for Robots 

    Visinsky, Monica L.; Cavallaro, Joseph R.; Walker, Ian D. (1993-09-01)
    Fault detection and fault tolerance are increasingly important for robots in space or hazardous environments due to the dangerous and often inaccessible nature of these environs. We have previously developed algorithms to ...
  • Edge Localized Image Sharpening via Reassignment with Application to Computed Tomography 

    Dorney, Timothy D.; Bhashyam, Srikrishna; Doran, Andrew; Choi, Hyeokho; Flandrin, Patrick; Baraniuk, Richard G. (2000-07-01)
    Traditional filtering methods operate on the entire signal or image. In some applications, however, errors are concentrated in specific regions or features. A prime example is images generated using computed tomography. ...
  • The effect of LLR clipping to the complexity of list sphere detector algorithms 

    Myllylä, Markus; Antikainen, Juho; Juntti, Markku; Cavallaro, Joseph R. (2007-11-01)
    The optimal detection for coded system requires the use of a maximum a posteriori (MAP) detection. A list sphere detector (LSD) can be used to approximate the MAP detector. Depending on the used list size, LSD provides a ...
  • The Effect of Preprocessing to the Complexity of List Sphere Detector Algorithms 

    Myllylä, Markus; Juntti, Markku; Cavallaro, Joseph R. (2008-09-01)
    A list sphere detector (LSD) is an enhancement of a sphere detector (SD) that can be used to approximate the soft output MAP detector used in the detection of the multiple-input multiple-output (MIMO) signals. The LSD ...
  • An Efficient Circulant MIMO Equalizer for CDMA Downlink: Algorithm and VLSI Architecture 

    Guo, Yuanbin; Zhang, Jianzhong; McCain, Dennis; Cavallaro, Joseph R. (2006-02-01)
    We present an efficient circulant approximation-based MIMO equalizer architecture for the CDMA downlink. This reduces the direct matrix inverse (DMI) of size (NF×NF) with O((NF)3) complexity to some FFT operations with ...
  • An Efficient Circulant MIMO Equalizer for CDMA Downlink: Algorithm and VLSI Architecture 

    Guo, Yuanbin; Zhang, Jianzhong (Charlie); McCain, Dennis; Cavallaro, Joseph R. (2005-12-01)
    In this paper, we present an efficient circulant approximation based MIMO equalizer architecture for the CDMA downlink. This reduces the Direct-Matrix-Inverse (DMI) of size (NF x NF) with O((NF)³) complexity to some ...
  • An Efficient Detection Technique for Synchronous CDMA Communication Systems Based on the Expectation Maximization Algorithm 

    Borran, Mohammad Jaber; Nasiri-Kenari, Masoumeh (2000-09-20)
    Maximum likelihood detection of superimposed signals in code-division multiple access (CDMA) communication systems has a computational complexity that is exponential in the number of users, and its implementation is ...