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共 465 条记录，以下是171-180 订阅

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Applications of non-uniform multi-gabor expansions to time-frequency analysis

Applications of non-uniform multi-gabor expansions to time-f...

引用

Conference on advanced signal processing algorithms architectures and implementations XiiI

作者： Hoffman, M Li, SD San Francisco State Univ Dept Math San Francisco CA USA

ISBN: (纸本)0819450782

We present a non-uniform multi-Gabor expansion (MGE) algorithm in which multiple windows and their corresponding translations and modulations are used for signal analysis. Analysis windows of varying supports, each corresponding to a chosen. scale of detail, decompose a signal using different translation and modulation parameters for each scale. Structural analysis of dual synthesis waveforms is provided. We show that synthesis waveforms can still be formed from translations and modulations of a set of basic dual windows at each scale. The use of different translation and modulation parameters at each scale allows for a more refined and concise time-frequency representation of the signal, while retaining the versatility of uniform MGEs in representing signal dynamics at many different scales. Examples of implementation and practical application will be presented.

关键词： Modulation Magnesium Matrices Time-frequency analysis Thulium Mathematics signal analysis Structural analysis Astronomy Physics

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A sharpness metric implementation for image processing applications with feedback

A sharpness metric implementation for image processing appli...

引用

Conference on advanced signal processing algorithms, architectures, and Implementantions XViiI

作者： Lam, Eric P. Thales Rayheon Syst Battlefield Radar Fullerton CA USA

ISBN: (纸本)9780819472946

Some image processing applications require an image meet a quality metric before processing it. If an image is so degraded that it is difficult or impossible to reconstruct, the input image may be discarded. In this paper, we present a metric that measures the relative sharpness with respect to a reference image frame. The reference frame may be a previous input image or an output frame from the system. The sharpness metric is based on analyzing edges. The assumption of this problem is that input images are similar to each other in terms of observation angle and time.

关键词： image processing system closed-loop system sharpness metric edge frame

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Interleaver design for high speed turbo decoders

Interleaver design for high speed turbo decoders

引用

Conference on advanced signal processing algorithms architectures and implementations XiiI

作者： Abbasfar, A Yao, K Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90024 USA

ISBN: (纸本)0819450782

Recently some efficient parallel architectures for turbo decoder have been proposed. In these architectures the bottleneck for the parallelization of the decoder is the interleaver. On the other hand, turbo codes achieve a very impressive near Shannon-capacity performance in which the interleaver plays a crucial role. Therefore, it is of great interest to design interleavers that are good from both performance and parallelization point of views. In this paper we have proposed an interleaver structure that is suitable for parallelization of turbo decoders. It is shown that such an interleaver can be designed to have good BER performance as well. By this structure not only fast decoders with very low latency can be built, but also the regularity of the decoder and the simplicity of the interleaver structure make them promising for VLSI implementation. We also present a fast algorithm to design such an interleaver, which can be used to design S-random interleavers as well. Such interleavers have been designed and the performances are compared to that of S-random interleavers by simulations.

关键词： Turbo Code interleaver design parallel processing high speed Turbo decoder

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PARAMETRIC METHODS FOR NONSTATIONARY SEISMIC DATA-ANALYSIS 4

PARAMETRIC METHODS FOR NONSTATIONARY SEISMIC DATA-ANALYSIS

引用

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

作者： MAIWALD, D MOLLE, JWD BOHME, JF Ruhr-Univ. Bochum (Germany) Imperial College of Science Technology and Medicine (United Kingdom)

ISBN: (纸本)0819412767

We investigate the estimation of both the number of waves and the wave parameters for transient wavefields in a geophysical application. Models of the earth have to be verified by seismogram analysis. We present two nonparametric methods for the estimation of wave parameters where one is based on the first-order stationary spectrum and the other one is based on the second-order cumulant spectrum. We also investigate a parametric method for wave parameter estimation which allows us to determine the number of incident waves. The algorithms are applied to synthetic seismic data.

关键词： Sensors Data modeling Phased arrays signal detection Algorithm development Data analysis Fourier transforms Statistical analysis Earthquakes Wave propagation

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Two-dimensional signal gating for low power in high-performance multipliers

Two-dimensional signal gating for low power in high-performa...

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Conference on advanced signal processing algorithms architectures and implementations XiiI

作者： Huang, ZJ Ercegovac, MD Univ Calif Los Angeles Dept Comp Sci Los Angeles CA 90095 USA

ISBN: (纸本)0819450782

We propose two-dimensional signal gating for high-performance multipliers including tree multipliers and array multipliers with an upper/lower left-to-right leapfrog (ULLRLF) structure. In ULLRLF array multipliers, the G-Y gating line follows the boundary of existing upper/lower partitioning. The G-X gating line goes through the upper and lower LRLF arrays. In tree multipliers, the G-Y gating line follows the existing partitioning of tree branches. The G-X line goes through all carry-save adders for partial product reduction. Because of the irregularity of the tree reduction structure, signal gating in tree multipliers is more complex than that in array multipliers. Experimental results indicate that two-dimensional gating is quite efficient in high-performance multipliers, with 65% power reduction under test data with large dynamic range.

关键词： signal gating low-power design high-performance multiplier

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CMOS PROCESSOR ELEMENT FOR A FAULT-TOLERANT SVD ARRAY 4

CMOS PROCESSOR ELEMENT FOR A FAULT-TOLERANT SVD ARRAY

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

作者： KOTA, K CAVALLARO, JR Rice Univ. (United States)

ISBN: (纸本)0819412767

This paper describes the VLSI implementation of a CORDIC based processor element for use in a fault-reconfigurable systolic array to compute the singular value decomposition (SVD) of a matrix. The chip implements a time redundant fault tolerance scheme, which allows processors adjacent to a faulty processor to act as computation backup during the systolic idle time. Also, processors around a fault collaborate to reroute data around the faulty processor. This form of time redundancy is attractive when tolerance to a few faults needs to be achieved with little hardware overhead.

关键词： Computer aided design Array processing Tolerancing Very large scale integration Data backup Data communications Control systems Logic Matrices Photography

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Matrix approach for fast implementations of logarithmic MAP decoding of turbo codes

Matrix approach for fast implementations of logarithmic MAP ...

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IEEE Pacific Rim Conference on Communications, Computers and signal processing (PACRIM 2001)

作者： Wang, DY Kobayashi, H Princeton Univ Dept Elect Engn Princeton NJ 08544 USA

ISBN: (纸本)0780370805

This paper describes two new matrix transform algorithms for the Max-Log-MAP decoding of turbo codes. In the proposed algorithms, the successive decoding procedures carried out in the conventional Max-Log-MAP algorithm are performed in parallel, and well formulated into a set of simple and regular matrix operations, which can therefore considerably speed up the decoding operations and reduce the computational complexity. The matrix Max-Log-MAP algorithms also maintain the advantage of the general logarithmic MAP like algorithms in avoiding complex numerical representation problems. They particularly facilitate the implementations of the logarithmic MAP like algorithms in special-purpose parallel processing VLSI hardware architectures. The matrix algorithms also allow simple implementations by using shift registers. The proposed implementation architectures for the matrix Max-Log-MAP decoding can effectively reduce the memory capacity and simplify the data accesses and transfers required by the conventional Max-Log-MAP as well as MAP algorithms.

关键词： turbo codes MAP algorithm Max-Log-MAP algorithm matrix transform VLSI

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A flexible arithmetic and logic unit for multimedia processing

A flexible arithmetic and logic unit for multimedia processi...

引用

Conference on advanced signal processing algorithms architectures and implementations XiiI

作者： Senthilvelan, M Schulte, MJ Univ Wisconsin Dept Elect & Comp Engn Madison WI 53706 USA

ISBN: (纸本)0819450782

Novel arithmetic units are needed to achieve the cost, performance, power, and functionality requirements of emerging multimedia systems. This paper presents the design and implementation of a 64-bit arithmetic and logic unit (ALU) for multimedia processing. The 64-bit ALU supports subword-parallel processing by allowing one 64-bit, two 32-bit, four 16-bit, or eight 8-bit operations to be performed in parallel. In addition to conventional ALU operations, the ALU also supports several operations for enhanced multimedia processing including parallel compare, parallel average, parallel minimum, parallel maximum, and parallel shift and add. To efficiently implement a variety of multimedia applications, the ALU supports saturating and wrap-around arithmetic operations on unsigned and two's complement operands. This paper compares the area and delay of the 64-bit multimedia ALU to those of a more conventional 64-bit ALU.

关键词： ALU adder saturating multimedia computer arithmetic DSP

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VHDL token-based performance modeling for 2D and 3D infrared search and track processing

VHDL token-based performance modeling for 2D and 3D infrared...

引用

SPIE Conference on advanced signal processing algorithms, architectures, and implementations ViiI

作者： Pauer, EK Pettigrew, MN Myers, CS Madisetti, VK Signal Proc Ctr Nashua NH 03061 USA

ISBN: (纸本)0819429163

This study develops and evaluates a new VHDL-based performance modeling capability for multiprocessor systems.* The framework for this methodology involved modeling the following system aspects: processor characterization, task modeling, network characterization, and data set size. Initially, all aspects are specified at an abstract) level, and eventually become specified at a detailed level through the process of verification and refinement of design assumptions. Processor characterization involves modeling the processor's speed, instruction set, and memory hierarchy. Task modeling is concerned with the execution time and instruction mix of software tasks within the system. Network characterization models bus protocols, topology, and bandwidths. Data set size refers to how much data is represented by the tokens used in the models. In this study, we applied and evaluated this methodology using both two-dimensional (2D) and three-dimensional (3D) infrared search and track (IRST) algorithms. Two different candidate processors were investigated: IBM PowerPC 604 and Texas Instruments TMS320C80. For the 2D IRST algorithm, the abstract and detailed performance modeling results were obtained far both processors using partitioned data and pipelined algorithmic approaches. For the 3D IRST algorithm, abstract performance models for pipelined and parallelized implementations on the PowerPC were developed. These models examined the feasibility of the implementations, the potential risk areas, and laid the groundwork for detailed performance modeling.

关键词： performance modeling VHDL IRST architectures simulation

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Invertible time-frequency representations

Invertible time-frequency representations

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SPIE Conference on advanced signal processing algorithms, architectures, and implementations ViiI

作者： Nelson, DJ Kenny, OP US Dept Def Ft George G Meade MD 20755 USA

ISBN: (纸本)0819429163

In this paper, we present a new class of representations of signals in the time-frequency (TF) plane. These representations are complex valued, linear, and satisfy reconstruction conditions in which the signal and its complex spectrum may be uniquely reconstructed from their TF representation. These surfaces are generalizations of one-dimensional linear transforms with which they share many properties.. The primary advantage of these representations is that the phase of the surface may be used to recover signal information which is not contained in real TF surfaces. Linearity guarantees that cross-terms normally associated with TF distributions do not exist in these representations. Several examples of invertible surfaces are presented, and it is demonstrated that these surfaces agree with normal intuition. Finally, a method, based on the phase gradient, is proposed as a method of modifying Fourier surfaces to produce representations which are more focused or more concentrated in time and frequency.

关键词： Time-Frequency signal reconstruction Fourier transform spectral phase instantaneous frequency group delay phase gradient

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