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检索条件"任意字段=Conference on Advanced Signal Processing Algorithms"

共 3499 条记录，以下是3131-3140 订阅

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An efficient optimal task allocation and scheduling algorithm for cyclic synchronous applications

An efficient optimal task allocation and scheduling algorith...

引用

IEEE International conference on Embedded and Real-Time Computing Systems and Applications (RTCSA)

作者： Hee-Jun Park Byung Kook Kim Department of Electrical Engineering Korea Advanced Institute of Science and Technology Taejon South Korea

We present an efficient optimal algorithm that allocates and schedules cyclic synchronous tasks into fully connected processors. We consider applications with cyclic synchronous tasks with heavy communication traffic, which run on multiprocessors with a fully connected communication network. We suggest the computing period as the performance measure to minimize the overall computation time. We use an individual start policy for task scheduling, and also introduce concepts and characteristics of the local period and the global period. To solve the complicated optimal scheduling problem in an efficient way, we propose a new spatial scheduling technique using scheduling space which represents all possible schedules in multi-dimensional space. By using spatial searching and an enhanced branch-and-bound technique, the optimal task allocation and schedule which minimizes the computing period can be found efficiently. Various examples and scheduling results show the efficiency of the proposed algorithm.

关键词： Scheduling algorithm Processor scheduling Optimal scheduling Multiprocessing systems signal processing algorithms System-on-a-chip Time measurement Parallel processing Computer architecture Dynamic scheduling

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Lower power Viterbi decoder architecture with a new clock-gating trace-back unit

Lower power Viterbi decoder architecture with a new clock-ga...

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International conference on VLSI and CAD, ICVC

作者： Je Hyuk Ryu Sang Cheon Kim Jun Dong Cho Hyun Woo Park Yung Hoon Chang Electrical and Computer Engineering Sugnkyunkwan University Suwon Kyunggi South Korea Samsung Advanced Institute of Technology Yongin si Kyunggi South Korea

This paper presents a new algorithm on lower-power survivor path memory implementation of the trace-back systolic array Viterbi algorithm. A novel idea is to reuse the already-generated trace-back routes to reduce the number of trace-back operations. It results in increasing the area of spurious switching activity region, and further reducing the switching activity with gated-clocks during trace-back operation. With the SYNOPSYS power estimation tool, DesignPower, our experimental result shows on the average 40% reduction in power with the same latency at a cost of 23% increase in area against the trace-back unit introduced by Truong et al. (1992). The proposed survivor memory scheme can be applied to the digital communication systems for targeting low power consumption.

关键词： Viterbi algorithm Decoding Clocks Registers Systolic arrays Convolutional codes Convolution signal processing algorithms Digital communication Channel coding

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Proceedings of SPIE: advanced signal processing algorithms, architectures, and implementations VIII

Proceedings of SPIE: Advanced signal processing algorithms, ...

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Advance signal processing algorithms, Atchitectures, and Implementations VIII

The proceedings contains 58 papers from the conference of SPIE: advanced signal processing algorithms, Architectures, and Implementations VIII. The topics discussed include: blind channel identification and extraction of more sources than sensors;blind channel estimation for CDMA systems with orthogonal modulation;blind equalization and source separation with MSK inputs and adaptive blind channel estimation by least-squares smoothing for CDMA.

关键词： signal processing

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Generalization of the autocorrelation function

Generalization of the autocorrelation function

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Cohen, L CUNY Hunter Coll New York NY 10021 USA

ISBN: (纸本)0819429163

We generalize the concept of the autocorrelation function to arbitrary physical variables and show how it can be used to define a local autocorrelation function. Using the local autocorrelation function we develop a new method to generate densities for arbitrary physical quantities. In addition, we show that the generalized autocorrelation function can be used to characterize functions with respect to a physical property.

关键词： Time-frequency analysis Fourier transforms Astatine signal processing

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A low power, high performance approach for time-frequency/time-scale computations

A low power, high performance approach for time-frequency/ti...

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Suter, BW Stevens, KS USAF Res Lab IFGC Griffiss AFB NY 13441 USA

ISBN: (纸本)0819429163

This paper presents an application of formal mathematics to create a high performance, low power architecture for time-frequency and time-scale computations implemented in asynchronous circuit technology that achieves significant power reductions and performance enhancements over more traditional approaches. Utilizing a combination of concepts from multirate signal processing and asynchronous circuit design, a case study is presented dealing with a new architecture for the fast Fourier transform, an algorithm that requires globally shared results. Then, the generalized distributive law is presented as an important paradigm for advanced asynchronous hardware design.

关键词： time-frequency computations time-scale computations asynchronous circuit design multirate signal processing generalized distributive law fast Fourier transform

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The process phantom - a tool for searching for chirps

The process phantom - a tool for searching for chirps

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Hershey, JE Gen Elect Corp Res & Dev Ctr Niskayuna NY 12309 USA

ISBN: (纸本)0819429163

Searching for wideband short duration chirps is an important issue in spectrum surveillance. We propose a method and apparatus, inspired by optical tomography, by which a one-dimensional signal is converted to a two-dimensional image. This image has the remarkable property that it may disclose discernible structure. A chirp in additive white Gaussian noise, even undersampled, may be detected. The process is inherently linear and may be easily implemented by parallel processing or through the construction of an optoelectronic device.

关键词： signal recognition spectrum surveillance phantom back projection chirps display

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Innovative implementation and simulation of signal processing algorithms for the ASTP & DITP programs.

Innovative implementation and simulation of signal processin...

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conference on signal and Data processing of Small Targets

作者： DeChaine, MD Kinashi, Y Nichols Res Corp Arlington VA 22202 USA

ISBN: (纸本)0819428221

An innovative approach is being used to implement and simulate the infrared (IR) and laser radar signal processing algorithms for the advanced Sensor Technology Program (ASTP) and the Discrimination Interceptor Technology Program (DITP). Although the algorithms will run on four different computer architectures, they will use the same source code for all implementations. The initial development and testing will occur in Mathcad on a Windows 95/NT personal computer, then move to simulation on a Silicon Graphics (SGI) workstation, then to scaled real-time simulation on a parallel high performance computer (HPC), and finally to the actual flight processor, the miniaturized parallel Wafer Scale signal Processor (WSSP) with a MIMD (multiple-instruction and multiple data) architecture. This flexibility is accomplished with code wrappers that implement interchangeable interface layers for the code modules, one wrapper for Mathcad matrices, one for C++ objects on the workstation, one for message passing with static routing on the HPC, and one for dynamically routed message passing on the WSSP. With this approach, developers can move modules back and forth from the workstation simulation environment to the implementation hardware. This will eliminate the need to maintain different versions of the same algorithm. The signal processing algorithms will be modified to work in a massively parallel architecture, with a message passing interface, which is simulated on the Silicon Graphics workstation, emulated on the HPC, and implemented on the WSSP. This approach will allow for pipeline processing as well as multiple, concurrently running instances of modules. In addition, innovative algorithms will fuse active laser radar detections and passive multicolor IR sensor measurements to improve target state estimation.

关键词： signal processing algorithms parallel processing simulation infrared sensors laser radar ballistic missile defense

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A multivariate speech activity detector based on the syllable rate

A multivariate speech activity detector based on the syllabl...

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Smith, D Townsend, J Nelson, DJ US Dept Def Ft George G Meade MD 20755 USA

ISBN: (纸本)0819429163

Computationally efficient algorithms which perform speech activity detection have significant potential economic and labor saving benefit, by automating an extremely tedious manual process. In many applications, it is desirable to extract intervals of speech which are bounded by segments of other signal types (fax/modem, music, static, dial tones, etc.). In the past, algorithms which successfully discriminate between speech and one specific other signal type have been developed. Frequently, these algorithms fail when the specific non-speech signal is replaced by a different non-speech signal. Little work has been done on combining such discriminators in order to solve the general speech vs. non-speech discrimination problem. Typically, several signal specific discriminators are blindly combined with predictable negative results. Moreover, when a large number of discriminators are involved, dimension reduction is achieved using Principal Components, which optimally compresses signal variance into the fewest number of dimensions. Unfortunately, these new coordinates are not necessarily optimal for discrimination. In this paper we apply graphical tools to determine a set of discriminators which produce excellent speech vs. non-speech clustering, thereby eliminating the guesswork in selecting good feature vectors. This cluster structure provides a basis for a general multivariate speech vs. non-speech discriminator, which compares very favorably with the TALKATIVE speech extraction algorithm.

关键词： signal processing

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Evolutionary spectrum estimation by deconvolving bilinear time-frequency distributions

Evolutionary spectrum estimation by deconvolving bilinear ti...

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Emresoy, MK El-Jaroudi, A Univ Pittsburgh Real Time Signal Proc Lab Pittsburgh PA 15261 USA

ISBN: (纸本)0819429163

A deconvolution technique to estimate the Evolutionary Spectrum (ES) of nonstationary signals by deconvolving the blurring effects of the kernel function fi om bilinear time frequency distributions (TFD) is presented. The resulting ES has desirable properties such as positivity, higher resolution, higher concentration in time-frequency. The proposed algorithm is computationally more efficient compared to the recently proposed entropy based deconvolution method. Unlike the entropy method the new algorithm can be adapted to deconvolve TFDs other than the spectrogram.

关键词： evolutionary spectrum bilinear time-frequency distributions deconvolution

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Feature preserving lossy image compression using nonlinear PDE's

Feature preserving lossy image compression using nonlinear P...

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SPIE conference on advanced signal processing algorithms, Architectures, and Implementations VIII

作者： Chan, TF Zhou, HM Univ Calif Los Angeles Dept Math Los Angeles CA 90095 USA

ISBN: (纸本)0819429163

In this report, we propose combining the Total Variation denoising method with the high loss wavelet compression for high noise level images. Numerical experiments show that TV-denoising can bring more wavelet coefficients closer to zero thereby making the compression more efficient while the salient features (edges) of the images can still be retained.

关键词： Image compression Wavelets Denoising Tolerancing Wavelet transforms Image processing Image quality Palladium Automatic target recognition Image storage

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