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Compiler techniques for increasing CU/PE overlap in SIMD machines

Compiler techniques for increasing CU/PE overlap in SIMD mac...

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International Symposium on parallel processing

作者： G. Saghi H.J. Siegel Microelectronics Research Center Department of Electrical Engineering University of Idaho Moscow ID USA Parallel Processing Laboratory School of Electrical Engineering Purdue University West Lafayette IN USA

Conceptually, an SIMD machine has the capability to overlap operation of the control unit (CU) with the operation of the processing elements (PEs). Computation of a single program is most efficient when the work load of the CU and the PEs is balanced. Load balancing between the CU and PEs is accomplished by migrating certain computations (e.g., PE-common array index calculations, loop index variable manipulation) from the PEs to the CU and vice versa. The goal of this research is to develop some of the techniques needed for the automatic specification of CU/PE overlap at compile time. As a proof of concept, the ELP compiler has been modified to support experimentation with CU/PE overlap.< >

关键词： Laboratories Microelectronics Broadcasting Contracts parallel processing Utility programs

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Partially adaptive radar signal processing: The cross-spectral approach 29

Partially adaptive radar signal processing: The cross-spectr...

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29th Asilomar Conference on Signals, Systems and computers, ACSSC 1995

作者： Goldstein, J. Scott Kogon, Stephen M. Reed, Irving S. Williams, Douglas B. Holder, E. Jeff USAF Rome Laboratory RL/C3BA 525 Brooks Rd. Grifilss AFBNY13441-4505 United States Statistical Signal and Image Processing Laboratory Department of Electrical Engineering University of Southern California Los AngelesCA90089-2565 United States Digital Signal Processing Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332-0250 United States

ISBN: (纸本)0818673702

This paper is concerned with reducing the rank of the adaptive weight vector in radar array signal processing. The motivation for reducing the rank is that modern space-time processing requires many more weights than can be supported on airborne and spacesegment platforms. The loss incurred in partially adaptive radar processing is that the steady-state Wiener solution of the lower rank weight vector may not perform as well as the full rank solution. Hence, this paper will be concerned with the Wiener solution of partially adaptive radar arrays and compare the performance of principal component techniques with the recently developed crossspectral technique. © 1996 IEEE.

关键词： Array processing

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VLSI implementation of very-high-order FIR filters

VLSI implementation of very-high-order FIR filters

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： M.A. Soderstrand K. Al-Marayati Digital Signal Processing and Communications Laboratory Department of Electrical and Computer Engineering University of California Davis USA

Very-high-order FIR filters required for the new modulation schemes associated with wireless computer networks and cellular telephones can be implemented in VLSI circuitry using low-power CMOS technology and a novel application of Residue Number System (RNS) arithmetic. Through this approach 20-bit equivalent integer arithmetic can be obtained for filters with 8 to 256 taps with only a modest increase in hardware for filters above 8 taps. Simulations indicate that this new technique can increase dramatically the number of taps implemented on a single VLSI chip when compared with an FIR filter generated using FIRGEN.

关键词： Very large scale integration Finite impulse response filter CMOS technology computer networks Cellular networks Telephony Circuits Application software Digital arithmetic Hardware

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An efficient algorithm for DTMF decoding using the subband NDFT

An efficient algorithm for DTMF decoding using the subband N...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： S. Bagchi S.K. Mitra Department of Electrical and Computer Engineering Signal and Image Processing Laboratory University of California Santa Barbara CA USA

An algorithm based on the subband nonuniform discrete Fourier transform (SB-NDFT) is proposed for decoding dual-tone multi-frequency (DTMF) signals. To decode a DTMF signal, its energy at the eight DTMF frequencies must be determined by evaluating samples of the NDFT at these frequencies. In the proposed SB-NDFT algorithm, these NDFT samples are computed by decomposing the input signal into two subbands. Since DTMF signals occupy the low-frequency part of the telephone bandwidth, the higher subband can be discarded for a fast, approximate computation. A performance comparison between algorithms based on the NDFT, SB-NDFT, DFT, and SB-DFT shows that the SB-NDFT requires the lowest number of computations to attain a specified level of performance.

关键词： Decoding Frequency Discrete Fourier transforms Signal processing Image processing Laboratories Telephony Bandwidth Communication system signaling Telephone sets

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Motion field prediction and restoration for low bit-rate video coding

Motion field prediction and restoration for low bit-rate vid...

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IEEE International Conference on Image processing

作者： S.N. Efstratiadis M.G. Strintzis A.K. Katsaggelos Information Processing Laboratory Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece McCormick School of Engineering and Applied Science Department of EECS Northwestern University Evanston IL USA

Motion vector field (MVF) prediction methods are presented followed by a restoration method. These methods combined with a proposed motion compensated (MC) video coding scheme are suitable for low bit rate transmission. An expression is derived for the initial estimate of the working MVF based on the preceding MVF. Spatio-temporally adaptive regularization is applied using neighborhood information. The output MVF is used as the initial prediction estimate for a Kalman MVF restoration approach. By applying this method to both the encoder and decoder, the resulting MC MVF and image intensity temporal updates are coded and transmitted. The restoration method produces accurate estimates of the MVF, thus resulting in a significant transmission cost reduction. Experiments with standard video-conference image sequences demonstrate the improved performance of the proposed scheme.

关键词： Video coding Image restoration Prediction methods Bit rate Video compression Kalman filters Costs Image sequences Nonlinear optics Decoding

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Delay models for the sea-of-wires array synthesis system 95

Delay models for the sea-of-wires array synthesis system

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European Design and Test (ED&TC) Conference

作者： Ing-Yi Chen Geng-Lin Chen Sy-Yen Kuo Department of Electronic Engineering Chung Yuan Christian University Chungli Taiwan Digital Signal Processing Department Computer & Communication Laboratory ITRI Hsinchu Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9780818670398

This paper presents two simple, accurate and efficient delay models, the static delay model and the dynamic delay model, to support performance optimization of VLSI Sea-of-Wires Arrays (SWA). The SWA delay model treats each distributed gate as an attribute-based primitive gate with different internal and external connection wires. Instead of solving differential equations, the SWA model determines delays by lookup from a multi-dimensional table. Only a few microseconds of execution time are needed per gate. The propagation delay along a circuit path is the sum of the delay segments of distributed gates in the path. The critical path of an SWA design can be identified with an O(n) timing analysis algorithm. For most AHPL Benchmarks, the table-lookup method achieves 5 orders of magnitude speedup over SPICE for the same circuits with error margin less than 7%.< >

关键词： SPICE Circuit simulation Wires Signal synthesis Very large scale integration Algorithm design and analysis Timing Equations Delay effects Table lookup

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Temporal frame interpolation for stereoscopic sequences using object-based motion estimation and occlusion detection

Temporal frame interpolation for stereoscopic sequences usin...

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IEEE International Conference on Image processing

作者： N. Grammalidis D. Tzovarns M.G. Strintzis Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Aristotle University of Thessaloniki Thessaloniki GR Inf. Processing Lab. Aristotelian Univ. of Thessaloniki Greece

Temporal frame interpolation techniques are presented, based on an object-based algorithm for 3-D motion estimation. This algorithm uses a joint estimation-segmentation scheme to minimize the displaced frame difference between a frame and its motion compensated prediction from the previous frame. Depth information is estimated beforehand from each stereo pair. Special attention is paid to the exploitation of occlusion information so as to improve the reconstruction quality of the interpolated frames. Experimental results are used to evaluate the performance of the proposed methods and to compare with more conventional frame interpolation techniques.

关键词： Interpolation Motion estimation Pixel Image reconstruction Motion detection Image segmentation Information processing Laboratories Bit rate HDTV

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Synthesis of buried oxide by plasma implantation with oxygen and water plasma

Synthesis of buried oxide by plasma implantation with oxygen...

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IEEE SOI-3D-Subthreshold Microelectronics Technology Unified Conference (S3S)

作者： J.B. Liu S.S.K. Iyer J. Min P.K. Chu R. Gronsky C. Hu N.W. Chueng Plasma Assisted Materials Processing Laboratory Department of Electrical Engineering and Computer sciences University of California Berkeley CA USA Department of Physics and Materials Science City University of Hong Kong Hong Kong China

Separation by plasma implantation of oxygen (SPIMOX) is a novel method for fabricating silicon-on-insulator (SOI) wafers. This method uses plasma immersion ion implantation (PIII) where the desired voltage of implant is applied to a wafer immersed in a plasma. SPIMOX is particularly suited for thin separation by implantation of oxygen (SIMOX) wafer fabrication. High implantation rates can be achieved in SPIMOX. A dose of nearly 10/sup 18/ cm/sup -2/ with an implant current density of 1 mA cm/sup -2/ can be achieved in 3 minutes of implantation time. The short implantation time and the simplicity of the implantation equipment makes it a potentially more economical method for fabricating SIMOX wafers. Moreover, the theoretical time for implantation remains constant in SPIMOX with increase in wafer size.

关键词： Oxygen Plasma immersion ion implantation Implants Plasma materials processing Plasma temperature Annealing Silicon Voltage Nuclear and plasma sciences Physics

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Dynamic real-time focusing of ultrasonic transducer arrays in sequential mode

Dynamic real-time focusing of ultrasonic transducer arrays i...

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IEEE Conference on Aerospace Applications

作者： B.R. Mahafza D.L. Knight M.W. Suits N.F. Audeh KBM Enterprises Inc. Huntsville AL USA Materials and Processing Laboratory NASA Marshall Space Flight Center AL USA Electrical and Computer Engineering Department University of Alabama Huntsville Huntsville AL USA

A technique for dynamic real time focusing of ultrasonic transducer arrays is introduced. This paper assumes a linear transducer array operating in the sequential mode. In this case, the elements are fired sequentially, one at a time, all elements receive in parallel. The returns are integrated coherently on the basis of equal geometric phase to synthesize the echoes of an array twice as large. Dynamic focusing is accomplished at any depth through electronic correction of the dominant quadratic phase terms. For this purpose a second order Taylor series expansion of the phase is used.< >

关键词： Ultrasonic transducer arrays Ultrasonic transducers Focusing Phased arrays Ultrasonic imaging Delay effects Logic Image resolution Signal processing Sampling methods

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Accuracy of filtered traces

Accuracy of filtered traces

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International Phoenix Conference on computers and Communications (IPCCC)

作者： S.K. Das E.E. Johnson Klipsch Dept. of Electr. & Comput. Eng. New Mexico State Univ. Las Cruces NM USA Parallel Architecture Research Laboratory Klipsch Department of Electrical and Computer Engineering New Mexico State University USA

Reducing the size of large address traces by "filtering" them through a small direct-mapped cache is a useful technique for making more efficient use of both secondary storage and processors used for trace-driven simulation. However, when filtered traces are used to drive cache simulators, the distortion introduced by such filtering can produce substantial errors in the miss ratios obtained, despite earlier reports to the contrary. We present the results of a systematic study of such errors, including a model for compensating for some errors.< >

关键词： computer errors Information filtering Information filters Computational modeling computer simulation Cache memory parallel architectures Laboratories Cache storage Drives

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