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advanced signal processing: algorithms, architectures, and implementations V

作者： Jullien, Graham A. Bizzan, S.S. Wigley, N.M. Miller, W.C. Univ. of Windsor Windsor ON Can

ISBN: (纸本)0819416207

Redundant Residue Number Systems (RRNS) have been proposed as suitable candidates for fault tolerance in compute intensive applications. The redundancy is based on multiple projections to moduli sub-sets and conducting a search for results that lie in a so-called illegitimate range. This paper presents RRNS fault tolerant procedures for a recently introduced finite polynomial ring mapping procedure (modulus replication RNS). The mapping technique dispenses with the need for many relatively prime ring moduli, which is a major draw-back with conventional RRNS systems. Although double, triple, and quadrupole modular redundancy can be implemented in the polynomial mapping structure, polynomial coefficient circuitry, or the independent direct product ring computational channels, for error detection and/or correction, this paper discusses the implementation of redundant rings which are generated by (1) redundant residues, (2) spare general computational channels, or (3) a combination of the two. The first architecture is suitable for RNS embedding in the MRRNS, and the second for single moduli mappings. The combination architecture allows a trade-off between the two extremes. The application area is in fault tolerant compute intensive DSP arrays.

关键词： Fault tolerant computer systems

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Application of algorithm-based fault tolerance to high-level synthesis of signal flow graphs

Application of algorithm-based fault tolerance to high-level...

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advanced signal processing: algorithms, architectures, and implementations V

作者： Karnik, Tanay Ramaswamy, Shankar Kang, Steve M. Banerjee, Prithviraj Univ. of Illinois/Urbana-Champaign Urbana IL USA

ISBN: (纸本)0819416207

Algorithm based fault tolerance techniques have been used for systolic processors and general purpose multiprocessors. In this paper, we have applied an algorithm based fault tolerance technique to high-level synthesis of signal flow graphs. The technique incorporates reliability into synthesized DSP filters. Given a signal Flow Graph representation for these filters, our schemes synthesize a reliable schedule for the operations in them and allocate functional units to the operations subject to hardware and reliability constraints. We impose reliability constraints to avoid compensating errors in fault detection. Our first scheme uses the well known duplicate and compare approach, while the second uses a novel linearity based checking approach used in algorithm based fault tolerance methods for matrix computations. The schemes have been implemented and results obtained by using them on sample signal flow graphs are presented. These results show the linearity based scheme to have a low time overhead. For example, this scheme takes about 10% extra time for the reliable synthesis of a 10th order IIR filter. Our proposed work extends previous work in the area in three directions: (1) use of linearity based checks, over duplication based checks, (2) handling cyclic flow graphs, over previous proposals for acyclic graphs, and (3) reliability constrained hardware mapping. Extensions of the schemes to nonlinear flow graphs is also proposed.

关键词： Fault tolerant computer systems

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Parallel architectures for real-time control

Parallel architectures for real-time control

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IEE Colloquium on High Performance Applications of Parallel architectures

作者： M.O. Tokhi M.A. Hossain M.J. Baxter P.J. Fleming Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

The authors present an investigation into the utilisation of parallel computing techinques for real-time simulation and control of a flexible beam structure in transverse vibration. The performance demands of modern control systems require the employment of complex algorithms with demanding operations which, in turn, leads to shorter sampling times. Therefore, real-time performance in control applications where the use of advanced control methods is warranted becomes difficult to accomplish. Many demanding complex control processes cannot be satisfactorily realised with conventional uni-processor and multi-processor systems. Previous investigations have demonstrated the limitations of employing only transputers for real-time implementations in control applications. Alternative strategies where multi-processor based systems are employed, utilising digital signal processing (DSP) and parallel processing techniques, could provide suitable methodologies.< >

关键词： Digital control Simulation Parallel architectures Real time systems signal processing Structural engineering Computer aided engineering

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advanced signal processing algorithms, architectures, and implementations IV

Advanced Signal Processing Algorithms, Architectures, and Im...

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advanced signal processing algorithms, architectures, and implementations IV 1993

The proceedings contain 45 papers. The topics discussed include: recent advances in nonstationary signal analysis: time-varying higher-order spectra and multilinear time-frequency signal analysis;real-time radar signal processing for autonomous aircraft landing;radon transform-based velocity estimation of vehicles with linear arrays;coherent signal-subspace processing for near-field broad-band source localization;performance analysis of the subspace-based DOA estimator in the presence of unknown noise;numerical integration of PDEs by discrete passive modeling of physical systems;time-recursive computation and real-time parallel architectures, with application on the modulated lapped transform;and discrete frequency estimation using parametric filtering and the contraction mapping method.

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UNIFYING PARAMETRIZED VLSI JACOBI algorithms AND architectures 4

UNIFYING PARAMETRIZED VLSI JACOBI ALGORITHMS AND ARCHITECTUR...

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4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： DEPRETTERE, EF MOONEN, M Delft Univ. of Technology (Netherlands) Katholieke Univ. Leuven (Belgium)

ISBN: (纸本)0819412767

Implementing Jacobi algorithms in parallel VLSI processor arrays is a non-trivial task, in particular when the algorithms are parametrized with respect to size and the architectures are parametrized with respect to space-time trade-offs. The paper is concerned with an approach to implement several time-adaptive Jacobi-type algorithms on a parallel processor array, using only Cordic arithmetic and asynchronous communications, such that any degree of parallelism, ranging from single-processor up to full-size array implementation, is supported by a `universal' processing unit. This result is attributed to a gracious interplay between algorithmic and architectural engineering.

关键词： Array processing signal processing Very large scale integration Computer aided design Parallel computing Process control MATLAB Computer architecture Detection and tracking algorithms Electrical engineering

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SYSTEMATIC CONSTRUCTION OF ORDER-RECURSIVE LS ESTIMATION algorithms WITH ELEMENTARY ORTHOGONAL TRANSFORMATIONS 4

SYSTEMATIC CONSTRUCTION OF ORDER-RECURSIVE LS ESTIMATION ALG...

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4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： LING, F Motorola (United States)

ISBN: (纸本)0819412767

This paper demonstrates that order-recursive least squares (ORLS) algorithms based on orthogonal transformations and hyperbolic transformations can be systematically constructed in two steps. The first step is to determine the structure of the ORLS algorithm according to the property of the data vector in the LS estimation and the requirements to the output. The second step is to determine the proper implementation of building blocks of the ORLS structure using orthogonal or hyperbolic transformations. The canonical ORLS structure and some possible orthogonal/hyperbolic implementations of their building blocks are presented. It is also shown that some of the orthogonal transformations are only applicable to certain types of ORLS structures and not to others.

关键词： Algorithm development Error analysis Detection and tracking algorithms Digital signal processing Expectation maximization algorithms Statistical analysis Factor analysis Magnesium Roads Telecommunications

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ERROR PROPAGATION OF SOME FAST RLS algorithms 4

ERROR PROPAGATION OF SOME FAST RLS ALGORITHMS

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4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： QIAO, SZ McMaster Univ. (Canada)

ISBN: (纸本)0819412767

The fast recursive least squares (RLS) algorithms have wide applications in signal processing and control. They are computationally efficient. Thus their stability is of major concern. In this paper, we investigate the error propagation and stability of some typical fast RLS algorithms. Through a random example, we show that a typical conventional fast RLS algorithm is weakly unstable in computing both the residuals and the gain vectors and a QR based algorithm is expected to be weakly stable in computing the residuals but weakly unstable in computing the gain vectors. We propose an error correction scheme for computing the gain vectors.

关键词： Algorithm development Condition numbers MATLAB Lead Process control signal processing Analytical research

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HIGHLY PIPELINED VLSI ARCHITECTURE FOR COMPUTATION OF FAST FOURIER-TRANSFORMS 4

HIGHLY PIPELINED VLSI ARCHITECTURE FOR COMPUTATION OF FAST F...

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4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： YEH, HJ Ecole Normale Superieure de Lyon (South Korea)

ISBN: (纸本)0819412767

An on-chip VLSI architecture for computation of Fourier transforms is presented. It performs the arithmetic operations in a digit-level pipeline fashion. For this purpose, the implementation of arithmetic operators is based on on-line (i.e., digit-serial and most significant digit first) arithmetic, and the transforms are performed by a parallel-pipeline version of the Cooley- Tukey fast Fourier transform (FFT) algorithm.

关键词： Fourier transforms Very large scale integration Transform theory Binary data Computer architecture Computing systems Matrices Network architectures Digital signal processing signal processing

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FFT algorithms FOR PRIME TRANSFORM SIZES AND THEIR implementations ON VAX, IBM3090VF, AND IBM RS/6000

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IEEE TRANSACTIONS ON signal processing 1993年第2期41卷 638-648页

作者： LU, C COOLEY, JW TOLIMIERI, R AWARE INC CAMBRIDGEMA 02142 UNIV RHODE ISL DEPT ELECT ENGNKINGSTONRI 02881 CUNY CITY COLL DEPT ELECT ENGNNEW YORKNY 10031

Variants of the Winograd FFT algorithm for prime transform size are derived that offer options as to operational counts and arithmetic balance. Their implementations on VAX, IBM 3090 VF, and IBM RS/6000 are discussed. For processors that perform floating-point addition, floating-point multiplication, and floating-point ''multiply-add'' with the same time delay, variants of the FFT algorithm have been designed such that all floating-point multiplications can be overlapped by using ''multiply-add.'' The use of a tensor product formulation, throughout, gives a means for producing variants of algorithms matching to computer architectures.

关键词： Fast Fourier transforms Arithmetic Delay effects Algorithm design and analysis Tensile stress Computer architecture

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INFORMATION IN THE TIME-FREQUENCY PLANE AND ITS APPLICATIONS TO ADAPTIVE RADAR signal-processing 4

INFORMATION IN THE TIME-FREQUENCY PLANE AND ITS APPLICATIONS...

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4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： BHATTACHARYA, TK JONES, G HAYKIN, S McMaster Univ. (Canada)

ISBN: (纸本)0819412767

The detection of small floating targets in an ocean environment is discussed in this paper. Because of the time-varying nature of the growler's radar returns, classical detection schemes do not work well. It is shown that these problems can be overcome if the detection is performed in the joint time-frequency plane. The effectiveness of the detection scheme is demonstrated by looking at two specific aspects of the problem: (1) detection of the target when the radar is scanning a certain sector, and (2) when the radar is dwelling in a certain azimuthal direction for a longer period of time.

关键词： Radar Time-frequency analysis Target detection Polarization signal detection Doppler effect Detection and tracking algorithms Feature extraction Fourier transforms Radar signal processing

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