Now showing items 923-942 of 1194

    • Rate-Distortion Optimized Image Compression using Wedgelets 

      Wakin, Michael; Romberg, Justin; Choi, Hyeokho; Baraniuk, Richard G. (2002-06-01)
      Most wavelet-based image coders fail to model the joint coherent behavior of wavelet coefficients near edges. Wedgelets offer a convenient parameterization for the edges in an image, but they have yet to yield a viable ...
    • Real-Time Algorithms and Architectures for Multiuser Channel Estimation and Detection in Wireless Base-Station Receivers 

      Rajagopal, Sridhar; Bhashyam, Srikrishna; Cavallaro, Joseph R.; Aazhang, Behnaam (2002-07-20)
      This paper presents alogrithms and architecture designs that can meet real-time requirements of multiuser channel estimation and detection in future wireless base-station receivers. Sophisticated algorithms proposed to ...
    • Real-Time DSP Multiprocessor Implementation for Future Wireless Base-Station Receivers 

      Jones, Bryan Allen; Rajagopal, Sridhar; Cavallaro, Joseph R. (2000-08-20)
      The convergence of cellular phones, the Internet, and laptop computers into a single small, lightweight, wireless information appliance drives a need for a high data rate, low-power digital wireless communication link to ...
    • Real-time implementation of the multistage detector for next generation Wideband CDMA systems 

      Xu, Gang; Cavallaro, Joseph R. (1999-07-20)
      The multistage detection algorithm has been widely accepted as an exective interference cancellation scheme for next generation Wideband Code Division Multiple Access (W-CDMA) base stations. In this paper, we propose a ...
    • Real-time video mosaicing with a high-resolution microendoscope 

      Bedard, Noah; Quang, Timothy; Schmeler, Kathleen; Richards-Kortum, Rebecca; Tkaczyk, Tomasz S. (2012)
      Microendoscopes allow clinicians to view subcellular features in vivo and in real-time, but their field-of-view is inherently limited by the small size of the probe's distal end. Video mosaicing has emerged as an effective ...
    • Receiver Implementation for MIMO-OFDM with AMC and Precoding 

      Ketonen, Johanna; Juntti, Markku; Cavallaro, Joseph R. (2009-11-01)
      Receivers for horizontally encoded LTE based MIMO-OFDM systems are considered in this paper. Adaptive modulation and coding (AMC) is used as well as precoding. The linear minimum mean square error (LMMSE), successive ...
    • Recent advances in Imaging and Spectroscopy with T-rays 

      Mittleman, Daniel M.; Neelamani, Ramesh; Gupta, Maya; Baraniuk, Richard G.; Nuss, Martin C. (1998-12-01)
      Recent work in terahertz "T-Ray" imaging is reported. With the ongoing development of commercially viable THz-TDS imaging system, opitmail signal processing strategies for the THz waveforms must be developed. Algorithms ...
    • Recent Advances in Memory Consistency Models for Hardware Shared Memory Systems 

      Adve, Sarita V.; Pai, Vijay S.; Ranganathan, Parthasarathy (1999-03-20)
      None
    • Recent Advances in Terahertz Imaging 

      Koch, Martin; Rudd, J. Van; Neelamani, Ramesh; Gupta, Maya; Baraniuk, Richard G.; Mittleman, Daniel M. (1999-06-01)
      We review recent progress in the field of terahertz "T-ray" imaging. This relatively new imaging technique, based on terahertz time-domain spectroscopy, has the potential to be the first portable far-infared imagin ...
    • Reconfigurable Architectures for Wireless Systems: Design Exploration and Integration Challenges 

      Cavallaro, Joseph R.; Brogioli, Michael C.; de Baynast, Alexandre; Radosavljevic, Predrag (2004-11-01)
      Mobile devices are severely power and area limited due to battery capacity and system size. In many of these example systems, advanced features require computationally complex signal processing on high-speed data streams ...
    • A Reconfigurable Decoder Architecture for Wireless LAN and Cellular Systems 

      Chadha, Kanu (2001-04-01)
      The rapid growth of wireless communications has led to the demand for communication devices which can support multiple standards and have the capability of switching from one to another on-the-fly. For instance, a device ...
    • Reconfigurable Multi-Standard Uplink MIMO Receiver with Partial Interference Cancellation 

      Yin, Bei; Amiri, Kiarash; Cavallaro, Joseph R.; Guo, Yuanbin (2012-06-01)
      As HSPA/HSPA+ and LTE/LTE-A evolve in parallel, the reconfigurability of a receiver to support multiple standards has become more and more important, especially for small cells. In this paper, we first suggest a reconfigurable ...
    • Reconfigurable Real-time MIMO Detector on GPU 

      Wu, Michael; Sun, Yang; Cavallaro, Joseph R. (2009-11-01)
      In a high performance multiple-input multiple-output (MIMO) system, a soft output MIMO detector combined with a channel decoder is often used at the receiver to maximize performance gain. Graphic processor unit (GPU) is a ...
    • Reconfigurable stream processors for wireless base-stations 

      Rajagopal, Sridhar; Rixner, Scott; Cavallaro, Joseph R. (2003-10-20)
      This paper presents the design and use of reconfigurable stream processors for the physical layer processing in wireless base-stations. Stream processors, traditionally used for high performance media processing, use ...
    • A reconfigurable viterbi decoder architecture 

      Chadha, Kanu; Cavallaro, Joseph R. (2001-11-20)
      We present the design and implementation of a novel reconfigurable Viterbi decoder which provides dynamic adaptation to different constraint length and code rate convolutional codes. A decoder what supports constraint ...
    • A recursive algorithm for digital Image Processing using Local Statistics 

      de Figueiredo, Rui J.P. (1979-06-20)
      An algorithm is presented for digital image processing based on local statistics. The algorithm constitutes a recursive implementaiton of an approach proposed and implemented nonrecursively by J.S. Lee (Naval Research ...
    • A Recursive Construction for Low-Complexity Non-coherent Constellations 

      Borran, Mohammad Jaber; Sabharwal, Ashutosh; Aazhang, Behnaam (2004-04-01)
      It is known that at high signal to noise ratio (SNR), or for large coherence interval (T), a constellations of unitary matrices can achieve the capacity of the non-coherent multiple-antenna system in block Rayleigh flat-fading ...
    • Reduced Complexity Soft MMSE MIMO Detector Architecture 

      Amiri, Kiarash; Dick, Chris; Rao, Raghu; Cavallaro, Joseph R. (2010-12-01)
      Computing the soft LLR values in MMSE receivers of MIMO systems requires a very large complexity. In this paper, we propose a reduced complexity soft MMSE detector for MIMO systems. We use different complexity reductions ...
    • Reduced QRD-M Detector in MIMO-OFDM Systems With Partial and Embedded Sorting 

      Guo, Yuanbin; McCain, Dennis (2005-11-01)
      In this paper,we present a reduced QRD-M matrix symbol detector in MIMO-OFDM systems. The QRD-M algorithm first decomposes the MIMO channel matrix into upper triangular matrix and applies a limited tree search to approximate the ...
    • Reduced Rank Algorithms for Wireless Space-Time Channels 

      Ndili, Obianuju (2000-05-20)
      The estimation of channel coefficients constitutes a major function of the receiver. It is also an important step in the signal detection process at the receiver, in a wireless communication system. To describe the space-time ...