Now showing items 611-630 of 1487

  • Implementation aspects of list sphere decoder algorithms for MIMO-OFDM systems 

    Myllylä, Markus; Cavallaro, Joseph R.; Juntti, Markku (Elsevier, 2010-10-01)
    A list sphere decoder (LSD) can be used to approximate the optimal maximum a posteriori (MAP) detector for the detection of multiple-input multiple-output (MIMO) signals. In this paper, we consider two LSD algorithms with ...
  • Implementation Issues of Multiuser Detection in CDMA Communication Systems 

    Xu, Gang (1999-05-20)
    Multistage detectors have been accepted in designs for next generation CDMA base stations because they are less complex than some other multiuser detectors. In this thesis, we propose a differencing method to further ...
  • Implementation of a 3GPP LTE Turbo Decoder Accelerator on GPU 

    Wu, Michael; Cavallaro, Joseph R. (IEEE, 2010-10-01)
    This paper presents a 3GPP LTE compliant turbo decoder accelerator on GPU. The challenge of implementing a turbo decoder is finding an efficient mapping of the decoder algorithm on GPU, e.g. finding a good way to parallelize ...
  • Implementation of a High Throughput 3GPP Turbo Decoder on GPU 

    Wu, Michael; Sun, Yang; Wang, Guohui; Cavallaro, Joseph R. (Springer, 2011-11-01)
    Turbo code is a computationally intensive channel code that is widely used in current and upcoming wireless standards. General-purpose graphics processor unit (GPGPU) is a programmable commodity processor that achieves ...
  • Implementation of a High Throughput Soft MIMO Detector on GPU 

    Wu, Michael; Sun, Yang; Gupta, Siddharth; Cavallaro, Joseph R. (Springer, 2011-07-01)
    Multiple-input multiple-output (MIMO) significantly increases the throughput of a communication system by employing multiple antennas at the transmitter and the receiver. To extract maximum performance from a MIMO system, ...
  • Implementation of Channel Estimation and Multiuser Detection Algorithms for W-CDMA on Digital Signal Processors 

    Rajagopal, Sridhar; Xu, Gang; Cavallaro, Joseph R. (1999-08-20)
    Proposed algorithms for Third Generation W-CDMA communication systems have extremely high performance requirements. In this paper, we study the implementation issues involved for one of the proposed multiuser channel ...
  • Implementation of Iterative Channel Equalization for MIMO Systems in WCDMA Downlink 

    Radosavljevic, Predrag; Cavallaro, Joseph R.; de Baynast, Alexandre (2003-10-20)
    In downlink transmission, channel multipaths destroy the orthogonality between users causing Multiple Access Interference (MAI). In order to restore the orthogonality between the users, chip-level channel equalization based ...
  • Implementation of LS, MMSE and SAGE Channel Estimators for Mobile MIMO-OFDM 

    Ketonen, Johanna; Juntti, Markku; Ylioinas, Jari; Cavallaro, Joseph R. (IEEE, 2012-12-01)
    The use of decision directed (DD) channel estimation in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) downlink receiver is studied in this paper. The 3GPP long term evolution ...
  • Implementation Trade-Offs For Linear Detection In Large-Scale MIMO Systems 

    Yin, Bei; Wu, Michael; Studer, Christoph; Cavallaro, Joseph R.; Dick, Chris (IEEE, 2013-06)
    In this paper, we analyze the VLSI implementation tradeoffs for linear data detection in the uplink of large-scale multiple-input multiple-output (MIMO) wireless systems. Specifically, we analyze the error incurred by ...
  • Importance sampling for analysis of direct detection optical communication systems 

    Mandayam, Narayan Bhimarayan Thiru (1991)
    Analytical solutions of the performance of optical communication systems are difficult to obtain and often, Monte Carlo simulations are used to achieve realistic estimates of the performance of such systems. However, for ...
  • Importance sampling for analysis of direct detection optical communication systems 

    Mandayam, Narayan B.; Aazhang, Behnaam (1995-02-20)
    Analytical solutions of the performance of optical communication systems are difficult to obtain and often, Monte Carlo simulations are used to achieve realistic estimates of the performance of such systems. However, for ...
  • Improved 8- and 16- state Space Time Codes for 4PSK with Two Transmit Antennas 

    Ionescu, Michael D.; Mukkavilli, Krishna Kiran; Yan, Zhiyuan; Lilliberg, Jorma (2001-07-20)
    New space-time codes for 4PSK constellations, designed via a modified determinant criterion, send 2 bits/sec/Hz and show improved performance in quasi-static flat fading.
  • Improved Achievable Rates for User Cooperation and Relay Channels 

    Khojastepour, Mohammad; Sabharwal, Ashutosh; Aazhang, Behnaam (2004-06-01)
    In this paper, we derive a new achievable rate region for the user cooperation channel, which exceeds the best known result for this channel [Wil83]. Since the user cooperation channel includes many other known channels ...
  • Improved Analysis for Determining Diffusion Coefficients from Short, Single-Molecule Trajectories with Photoblinking 

    Shuang, Bo; Byers, Chad P.; Kisley, Lydia; Wang, Lin-Yung; Zhao, Julia; Morimura, Hiroyuki; Link, Stephan; Landes, Christy F. (2013)
    Two Maximum Likelihood Estimation (MLE) methods were developed for optimizing the analysis of single-molecule trajectories that include phenomena such as experimental noise, photoblinking, photobleaching, and translation ...
  • An Improved Multifractal Formalism and Self Affine Measures 

    Riedi, Rudolf H. (1993-01-20)
    This document is a six page summary of my Ph.D. thesis in which multifractal formalism based on counting on coarse levels (as opposed to a dimensional approach) is developed. This formalism is then applied to self-affine ...
  • An Improved Multifractal Formalism and Self Similar Measures 

    Riedi, Rudolf H. (1995-01-01)
    To characterize the geometry of a measure, its so-called generalized dimensions D(<i>q</i>) have been introduced recently. The mathematically precise definition given by Falconer turns out to be unsatisfactory for reasons ...
  • Improved Time-Frequency Filtering of Signal-Averaged Electrocardiograms 

    Sayeed, Akbar M.; Jones, Douglas L. (1995-01-15)
    A recently proposed time-frequency filtering technique has shown promising results for the enhancement of signal-averaged electrocardiograms. This method weights the short-time Fourier transform (STFT) of the ensemble-averaged ...
  • Improved Type-Based Detection of Analog Signals 

    Goncalves, Paulo; Baraniuk, Richard G. (1997-04-01)
    When applied to continuous-time observations, type-based detection strategies are limited by the necessity to crudely quantize each sample. To alleviate this problem, we smooth the types for both the training and observation ...
  • Improved Wavelet Denoising via Empirical Wiener Filtering 

    Ghael, Sadeep; Sayeed, Akbar M.; Baraniuk, Richard G. (1997-07-01)
    Wavelet shrinkage is a signal estimation technique that exploits the remarkable abilities of the wavelet transform for signal compression. Wavelet shrinkage using thresholding is asymptotically optimal in a minimax ...
  • Improving Connection Times for Bluetooth Devices in Mobile Environments 

    Welsh, Erik; Murphy, Patrick; Frantz, Patrick (2002-03-20)
    Communications devices in a highly mobile environment need to minimize connection setup times in order to maximize useful data transfer. In this paper we investigate - empirically and through simulations - the device ...