Now showing items 200-219 of 268

  • QRD-QLD searching based sphere detection for emerging MIMO downlink OFDM receivers 

    Radosavljevic, Predrag; Kim, Kyeong Jin; Cavallaro, Joseph R. (IEEE, 2008-11-01)
    In this paper, a detection algorithm with parallel partial candidate-search algorithm is presented. Two fully independent partial search processes are simultaneously employed for two groups of transmit antennas based on ...
  • Quantization of Sparse Representations 

    Boufounos, Petros T.; Baraniuk, Richard G. (2007-01-16)
    Compressive sensing (CS) is a new signal acquisition technique for sparse and compressible signals. Rather than uniformly sampling the signal, CS computes inner products with randomized basis functions; the signal is then ...
  • Rapid Industrial Prototyping and Scheduling of 3G/4G SoC Architectures with HLS Methodology 

    Guo, Yuanbin; McCain, Dennis; Cavallaro, Joseph R. (2005-12-01)
    In this paper, we present a Catapult C/C++ based methodology that integrates key technologies for high-level VLSI modelling of 3G/4G wireless systems to enable extensive time/area tradeoff study. A Catapult C/C++ based ...
  • Rapid Industrial Prototyping and SoC Design of 3G/4G Wireless Systems Using an HLS Methodology 

    Guo, Yuanbin; McCain, Dennis; Cavallaro, Joseph R.; Takach, Andres (Hindawi Publishing Corporation, 2006-07-01)
    Many very-high-complexity signal processing algorithms are required in future wireless systems, giving tremendous challenges to real-time implementations. In this paper, we present our industrial rapid prototyping experiences ...
  • A Rapid Prototyping Environment for Wireless Communication Embedded Systems 

    Jones, Bryan A.; Cavallaro, Joseph R. (Hindawi Publishing Corporation, 2003-05-01)
    This paper introduces a rapid prototyping methodology which overcomes important barriers in the design and implementation of digital signal processing (DSP) algorithms and systems on embedded hardware platforms, such as ...
  • Rapid Prototyping of Wireless Communications Systems 

    Jones, Bryan Allen (2002-05-20)
    This thesis introduces rapid prototyping methodology which overcomes important barriers in the design and implementation of digital signal processing (DSP) algorithms and systems on embedded hardware platforms, such as ...
  • Rapid Scheduling of Efficient FPGA Architectures for Next-Generation HSDPA Wireless System Using Precision C Synthesizer 

    Guo, Yuanbin; McCain, Dennis; Xu, Gang; Cavallaro, Joseph R. (2003-06-20)
    In this paper, an efficient design flow integrating Mentor Graphics Precesion C and HDL designer is derived. In this hybrid prototyping environment, efficient FPGA architec-tures are scheduled rapidly with specific hardware ...
  • Rate-constrained Relaying: A Model for Cooperation with Limited Relay Resources 

    Sabharwal, Ashutosh; Mitra, Urbashi (2005-06-01)
    In this paper, the impact of limited resources on achievable rates in relay channels is investigated. Resource limitation is modeled as a rate constraint, Rbar, which constrains the rate at which a relay can reliably ...
  • 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 (IEEE, 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 ...
  • Receiver Implementation for MIMO-OFDM with AMC and Precoding 

    Ketonen, Johanna; Juntti, Markku; Cavallaro, Joseph R. (IEEE, 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 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 (WWRF, 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 ...
  • Reconfigurable Multi-Standard Uplink MIMO Receiver with Partial Interference Cancellation 

    Yin, Bei; Amiri, Kiarash; Cavallaro, Joseph R.; Guo, Yuanbin (IEEE, 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. (IEEE, 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 ...
  • Reduced Complexity Soft MMSE MIMO Detector Architecture 

    Amiri, Kiarash; Dick, Chris; Rao, Raghu; Cavallaro, Joseph R. (Wireless Innovation Forum, Inc., 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 (IEEE ComSoc, 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 ...
  • Reducing Dynamic Power Consumption in Next Generation DS-CDMA Mobile Communication Receivers 

    Chandrasekhar, Vikram (2002-08-01)
    Reduction of the power consumption in portable wireless receivers is an important consideration for next-generation cellular systems specified by standards such as the UMTS, IMT2000. This thesis explores the design-space ...