Now showing items 331-350 of 1097

    • Finite Memory-length Linear Multiuser detection for Asyncchronous Communications 

      Juntti, Markku J.; Aazhang, Behnaam (1997-05-20)
      Decorrelating, linear, minimum mean-squared error (LMMSE), and noise-whitening multiuser detectors for code-division multiple-access systems (CDMA) are ideally infinite memory-length (referred to as IIR) detectors. To ...
    • Finite memory-length linear multiuser detection for asynchronous CDMA communications 

      Juntti, Markku J.; Aazhang, Behnaam (1997-10-20)
      Decorrelating, linear, minimum mean-squared error (LMMSE), and noise-whitening multiuser detectors for code-division multiple-access systems (CDMA) are ideally infinite memory-length (referred to as IIR) detectors. To ...
    • Finite Rate Feedback Design for Multiple Transmit Antennas 

      Mukkavilli, Krishna Kiran; Sabharwal, Ashutosh; Aazhang, Behnaam (2002-10-20)
      Many practical systems employ a feedback channel to convey the channel state information to the transmitter.The capacity of the feedback channels is usually limited to a few bits per frame. We design feedback based ...
    • Fixed Point Error Analysis Of Multiuser Detection and Synchronization Algorithms For CDMA Communication Systems 

      Sengupta, Chaitali; Das, Suman; Cavallaro, Joseph R.; Aazhang, Behnaam (1998-04-20)
      Conventional correlation based single-user techniques for Direct Sequence Code Division Multiple Access (DS-CDMA) wireless communication systems are susceptible to performance degradation due to interference from other ...
    • Flex-Sphere: An FPGA Configurable Sort-Free Sphere Detector For Multi-user MIMO Wireless Systems 

      Amiri, Kiarash; Dick, Chris; Rao, Raghu; Cavallaro, Joseph R. (2008-10-01)
      Spatial division multiplexing (SDM) in MIMO technology significantly increases the spectral efficiency, and hence capacity, of a wireless communication system: it is a core component of the next generation wireless systems, ...
    • A Flexible and Efficient Application Programming Interface (API) for a Customizable Proxy Cache 

      Pai, Vivek S.; Cox, Alan; Pai, Vijay S.; Zwaenepoel, Willy (2003-03-20)
      This paper describes the design, implementation, and performance of a simple yet powerful Application Programming Interface (API) for providing extended services in a proxy cache. This API facilitates the development of ...
    • A Flexible LDPC/Turbo Decoder Architecture 

      Sun, Yang; Cavallaro, Joseph R. (2011-07-01)
      Low-density parity-check (LDPC) codes and convolutional Turbo codes are two of the most powerful error correcting codes that are widely used in modern communication systems. In a multi-mode baseband receiver, both LDPC ...
    • Flexible N-Way MIMO Detector on GPU 

      Wu, Michael; Yin, Bei; Cavallaro, Joseph R. (2012-10-17)
      This paper proposes a flexible Multiple-Input Multiple-Output (MIMO) detector on graphics processing units (GPU). MIMO detection is a key technology in broadband wireless system such as LTE,WiMAX, and 802.11n. Existing ...
    • Flexible Wavelet Transforms Using Lifting 

      Claypoole, Roger L.; Baraniuk, Richard G. (1998-09-01)
      We introduce and discuss biorthogonal wavelet transforms using the lifting construction. The lifting construction exploits a spatial-domain, prediction-error interpretation of the wavelet transform and provides a powerful ...
    • Floating-Point CORDIC for Matrix Computations 

      Cavallaro, Joseph R.; Luk, Franklin T. (1988-10-01)
      The CORDIC algorithms provide a VLSI hardware technique for computing the inverse tangents and vector rotations needed by many matrix decomposition algorithms. Although normally stated for fixed-point arithmetic, the CORDIC ...
    • ForWaRD: Fourier-Wavelet Regularized Deconvolution for Ill-Conditioned Systems 

      Neelamani, Ramesh; Choi, Hyeokho; Baraniuk, Richard G. (2004-02-01)
      We propose an efficient, hybrid <i>Fourier-Wavelet Regularized Deconvolution</i> (ForWaRD) algorithm that performs noise regularization via scalar shrinkage in both the Fourier and wavelet domains. The Fourier shrinkage ...
    • Four top reasons why mutual information does not assess neural information processing 

      Johnson, Don (2002-07-20)
      Mutual information between stimulus and response has been advocated as an information theoretic measure of a neural system's capability to process information. Once calculated, the result is a single number that supposedly ...
    • A Fourier-Prony Tauberian Approach to the Analysis of a Mixture of Delayed Signals 

      de Figueiredo, Rui J.P.; Hu, C.L. (1979-09-20)
      Let x and y be signals (i.e. real-valued functions of time) of finite duration and energy. In the present paper, we develop a frequency domain Prony approach for interpolating, or in general, approximating y(t) by ....
    • An FPGA Based Rapid Prototyping Platform for MIMO Systems 

      Murphy, Patrick; Lou, Feifei; Sabharwal, Ashutosh; Frantz, Patrick (2003-11-20)
      There exists a seemingly limitless demand for wireless communications systems capable of higher datarates with lower power consumption. While the demand for improvement in these systems seems limitless, the spectrum ...
    • An FPGA Implementation Of Alamouti's Transmit Diversity Technique 

      Murphy, Patrick; Frantz, Patrick; Dick, Chris (2003-10-01)
      This paper presents the FPGA implementation of a multiple antenna wireless communications system based on Alamouti's transmit diversity scheme. Alamouti's transmit diversty scheme is a space-time block code with support ...
    • FPGA Implementation of Dynamic Threshold Sphere Detection for MIMO Systems 

      Amiri, Kiarash; Cavallaro, Joseph R. (2006-11-01)
      In this paper, we consider the FPGA implementation of a modified sphere detection algorithm. We analyze breadth-first and depth-first search in sphere detection, and compare the relative performance and complexity. Based ...
    • FPGA Implementation of Matrix Inversion Using QRD-RLS Algorithm 

      Karkooti, Marjan; Cavallaro, Joseph R.; Dick, Chris (2005-10-01)
      This paper presents a novel architecture for matrix inversion by generalizing the QR decomposition-based recursive least square (RLS) algorithm. The use of Squared Givens rotations and a folded systolic array makes this ...
    • FPGA Implementation of Matrix Inversion Using QRD-RLS Algorithm 

      Karkooti, Marjan; Cavallaro, Joseph R.; Dick, Chris (2005-11-01)
      This paper presents a novel architecture for matrix inversion by generalizing the QR decomposition-based recursive least square (RLS) algorithm. The use of Squared Givens rotations and a folded systolic array makes this ...
    • FPGA in Wireless Communications Applications 

      Amiri, Kiarash; Duarte, Melissa; Cavallaro, Joseph R.; Dick, Chris; Rao, Raghu; Sabharwal, Ashutosh (2012-07-12)
      In the past decade we have witnessed explosive growth in the wireless communications industry with over 4 billion subscribers worldwide. While first and second generation systems focused on voice communications, third ...
    • FPGA Prototyping of A High Data Rate LTE Uplink Baseband Receiver 

      Wang, Guohui; Yin, Bei; Amiri, Kiarash; Sun, Yang; Wu, Michael; Cavallaro, Joseph R. (2009-11-01)
      The Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) standard is becoming the appropriate choice to pave the way for the next generation wireless and cellular standards. While the popular OFDM ...