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检索条件"任意字段=Advanced Algorithms and Architectures for Signal Processing IV 1989"

共 49 条记录，以下是41-50 订阅

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ENHANCED INTERPROCESSOR COMMUNICATION STRATEGIES FOR PARALLEL TMS320C40 DIGITAL signal PROCESSOR SYSTEMS 4

ENHANCED INTERPROCESSOR COMMUNICATION STRATEGIES FOR PARALLE...

引用

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

作者： HARTLEY, DA HARVEY, DM Liverpool John Moores Univ. (United Kingdom)

ISBN: (纸本)0819412767

The Texas Instruments' TMS320C40 digital signal processor contains communication hardware which enables processors to be connected together to form multiprocessing systems. Analysis of the devices communication channels suggests that it would be beneficial to use additional communication hardware to maximize system performance. The use of mesh routing chips in conjunction with the processors has been investigated. The two devices are interfaced using two TMS320C40 communication channels. Lower message latencies can be achieved by using TMS320C40 communication channels to perform nearest neighbor communications while using the routing chips to perform all other message routing. However, the use of additional TMS320C40 channels can degrade the rate at which packets are injected and consumed from the network, resulting in under utilization of the network bandwidth.

关键词： Telecommunications signal processing Data communications Digital signal processing Systems modeling Computer simulations Data processing Switches Computing systems Data modeling

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REAL-TIME RADAR signal-processing FOR AUTONOMOUS AIRCRAFT LANDING 4

REAL-TIME RADAR SIGNAL-PROCESSING FOR AUTONOMOUS AIRCRAFT LA...

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

作者： SADJADI, F HELGESON, M RADKE, J STEIN, G Machine Intelligence Corp. (United States) Honeywell Inc. (United States)

ISBN: (纸本)0819412767

Landing in poor weather is a crucial problem for the air transportation system. To aid the pilots for these conditions several solutions have been suggested and/or implemented including instrument landing systems (ILS) and microwave landing systems (MLS) that put the responsibility of the landing to a large extent in the hands of the airport facilities. These systems even though useful are not available due to their high costs even in a few major metropolitan airports. This shortcoming has generated interest in providing all weather capabilities not on the landing facility but on the vehicle itself. The Synthetic Vision System Technology Demonstration sponsored by the United States Federal Aviation Administration (FAA) and the U.S. Air Force represents an effort to respond to the above needs. In this paper we present a summary of a typical synthetic vision system. This system consists of a scanning 35 GHz radar, a scanning antenna, a signal/image processor and a head up display (HUD). The pilot is presented a final perspective image of the scene sensed by the radar with associated flight guidance symbology. This system is implemented in real time hardware and has been undergoing tower and flight testing under a variety of weather conditions since early 1992.

关键词： Radar signal processing Antennas Heads up displays Video Digital signal processing Process control Radar signal processing Image enhancement Imaging systems

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Modulo-addressing utilization in automatic software synthesis for digital signal processors

Modulo-addressing utilization in automatic software synthesi...

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1997 IEEE International Conference on Acoustics, Speech, and signal processing (ICASSP 97)

作者： Willems, M Keding, H Zivojnovic, V Meyr, H Aachen Univ of Technology Aachen Germany

ISBN: (纸本)0818679204

Digital signal Processors (DSPs) have become key components for the implementation of digital signal processing systems. With DSPs moving into new application domains and the increasing complexity of modern DSP architectures, efficient programming support receives major interest. Therefore, an optimizing compiler becomes a must for future DSP-architectures. Todays DSP compilers result in significant overheads both in memory consumption and program execution time compared to hand-written assembly code. This is mainly due to an inefficient compiler support of the DSP specific architectural features, such as the modulo-addressing capability which is an enabling feature for a large class of DSP algorithms. Within this paper we analyze why existing compilers fail short in supporting the module-addressing mode and present a compiler concept that allows the efficient utilization of this feature. We describe how an advanced compiler optimization strategy allows a near optimum support of the module-addressing mode, and point out why this concept is favorable to DSP-specific language extensions.

关键词： Program compilers

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APPLICATIONS OF TIME-FREQUENCY AND TIME-SCALE TRANSFORMS TO ULTRA-WIDE-BAND RADAR TRANSIENT signal-DETECTION 4

APPLICATIONS OF TIME-FREQUENCY AND TIME-SCALE TRANSFORMS TO ...

引用

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

作者： FARGUES, MP BROOKS, WA Naval Postgraduate School (United States)

ISBN: (纸本)0819412767

In this paper we use a non-stationary approach and analyze ultra-wideband (UWB) radar data using time-frequency and time-scale transformations. The time-frequency transformations considered are the Short-Time Fourier Transform (STFT), the Wigner-Ville Distribution (WD), the Instantaneous Power Spectrum (IPS), and the ZAM transform. Two discrete implementations of the Wavelet Transform (DWT) are also investigated: the decimated A- trous algorithm proposed by Holschneider et al, which uses non-orthogonal wavelets; and the Mallat algorithm, which employs orthogonal wavelets. The transients under study are UWB radar returns from a boat (with and without corner reflector) in the presence of sea clutter, multipath, and radio frequency interferences (RFI). Results show that all time-frequency and time-scale transforms clearly detect the transient radar returns corresponding to the boat with a corner reflector. However, as the radar cross section of the target decreases (boat without a corner reflector), results change drastically as the RFI component dominates the signal. Simulations show that the Instantaneous Power Spectrum may be better adapted for localizing the transient among the time-frequency techniques studied. The decimated A-trous algorithm has the best time resolution of the techniques studied as the return appears better localized in the scalogram.

关键词： Time-frequency analysis Transform theory Radar Wavelets Reflectors Electromagnetic coupling UWB radar Discrete wavelet transforms Digital filtering signal detection

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EVOLUTIONARY SPECTRAL ESTIMATION BASED ON ADAPTivE USE OF WEIGHTED NORMS 4

EVOLUTIONARY SPECTRAL ESTIMATION BASED ON ADAPTIVE USE OF WE...

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

作者： CABRERA, SD FLORES, BC THOMAS, G VEGAPINEDA, J Univ. of Texas/El Paso (United States)

ISBN: (纸本)0819412767

In this paper, an evolutionary spectral estimator based on the application of Adaptive Weighted Norm Extrapolation (AWNE) is formulated and illustrated for analysis of nonstationary signals. The AWNE method produces a stationary extension of the data so that computing its Fourier transform yields a nonparametric, high-resolution spectrum estimate. The evolutionary formulation described here uses a time slice of the time-averaged Spectrogram to select the initial weight function (prior spectrum) used in AWNE for each block of data. This function strongly influences the final shape of the resulting spectrum. The resulting Short-Time AWNE (STAWNE) time-frequency representation yields improved frequency-domain resolution, preserves components which last longer than one time block, and is devoid of cross-terms. Comparison with short-time autoregressive spectral estimation yields improved consistency in the spectral energy levels as time varies. Finally, this sequential spectrum estimator is also illustrated for use in range-Doppler imaging of reflectivity surfaces having prominent scatterers by hybrid two-dimensional spectral estimation in-tandem with the discrete Fourier transform.

关键词： Autoregressive models Fourier transforms Time-frequency analysis Stars Data modeling Statistical analysis Yield improvement Electroluminescence Reflectivity signal analyzers

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signal-processing FOR HIGH-DENSITY DIGITAL MAGNETIC RECORDING

SIGNAL-PROCESSING FOR HIGH-DENSITY DIGITAL MAGNETIC RECORDIN...

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3RD ANNUAL EUROPEAN COMPUTER CONF ( COMPEURO 89 ) : VLSI AND COMPUTER PERIPHERALS

作者： DOLivO, F IBM Research Div Ruschlikon Switz

ISBN: (纸本)0818619406

The signal-processing techniques most often used in digital magnetic recording systems are run-length limited (RLL) coding and peak detection (PD). The application of more advanced methods, such as partial-response (PR) signaling and maximum-likelihood sequence detection (MLSD), allows a further increase in the recording densities and reliability presently achieved. After reviewing RLL coding and PD schemes, recording systems using PR signaling and MLSD (PRML) are described. Viterbi decoding and decision-directed algorithms for automatic gain control and timing recovery are discussed for the two types of PR scheme best suited for magnetic recording, class-iv (PR-iv) and extended class-iv (EPR-iv). Results of a performance study on PD and PRML systems which demonstrate the superiority of the PRML approach are presented. For the two PRML systems considered, sensitivity to various parameters and performance in an off-track situation were investigated. The results shown indicate that the two schemes are equally robust and that PR-iv signaling is superior to EPR-iv in off-track situations. A PRML system based on PR-iv signaling is also simpler to realize.

关键词： Recording

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A distributed sensor network structure with fault-tolerant facilities

A distributed sensor network structure with fault-tolerant f...

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Intelligent Control and Adaptive Systems 1989

作者： Iyengar, S.S. Thomas, Daryl Department of Computer Science Louisiana State University Baton RougeLA70803 United States

In this paper, we discuss advanced architectures for distributed sensor networks. This includes the development of efficient algorithms for data-combination, noise removal, and information abstraction. Specifically, the we discuss the following issues in distributed signal processing: ∗ A new signal processing architecture for networking spatially distributed sensors. ∗ An improved method for integration of sensor information. ∗ Fault-tolerance capabilities within the proposed signal processing architecture. © 1990 SPIE. All rights reserved.

关键词： signal processing

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The design and implementation of multidimensional systolic arrays for DSP applications

The design and implementation of multidimensional systolic a...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： N. Ling M.A. Bayoumi The Center for Advanced Computer Studies University of Southwestern Louisiana Lafayette LA USA

The authors present a technique for transforming DSP (digital signal processing) algorithms to a form suitable for multidimensional systolic array implementation. The aim of the transformation is to speed up computation without much increase in area requirement. The price to be paid is the small amount of additional circuitry (usually in the form of adders and interconnection wires) required for interrow or interplane communications. The application of the technique to some DSP algorithms is presented. The systolic networks produced are implemented using NORA CMOS logic structure and laid out using 3- mu m CMOS p-well technology. Areas and times for the resulting architectures are evaluated and discussed.< >

关键词： Multidimensional systems Systolic arrays Digital signal processing signal processing algorithms CMOS technology Multidimensional signal processing Adders Integrated circuit interconnections Wires CMOS logic circuits

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signal processing for high-density digital magnetic recording

Signal processing for high-density digital magnetic recordin...

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CompEuro

作者： F. Dolivo IBM Research Division Zurich Research Laboratory Ruschlikon Switzerland

ISBN: (纸本)0818619406

The signal-processing techniques most often used in digital magnetic recording systems are run-length limited (RLL) coding and peak detection (PD). The application of more advanced methods, such as partial-response (PR) signaling and maximum-likelihood sequence detection (MLSD), allows a further increase in the recording densities and reliability presently achieved. After reviewing RLL coding an PD schemes, recording systems using PR signaling and MLSD (PRML) are described. Viterbi decoding and decision-directed algorithms for automatic gain control and timing recovery are discussed for the two types of PR scheme best suited for magnetic recording, class-iv (PR-iv) and extended class-iv (EPR-iv). Results of a performance study on PD and PRML systems which demonstrate the superiority of the PRML approach are presented. For the two PRML systems considered, sensitivity to various parameters and performance in an off-track situation were investigated. The results shown indicate that the two schemes are equally robust and that PR-iv signaling is superior to EPR-iv in off-track situations. A PRML system based on PR-iv signaling is also simpler to realize.< >

关键词： Digital signal processing Digital magnetic recording Magnetic recording Maximum likelihood detection Viterbi algorithm Maximum likelihood decoding signal processing algorithms Gain control Timing Robustness

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