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PIPELINED ADAPTIVE DFE architectures 4

PIPELINED ADAPTIVE DFE ARCHITECTURES

引用

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

作者： SHANBHAG, NR PARHI, KK Univ. of Minnesota/Twin Cities (United States)

ISBN: (纸本)0819412767

Fine-grain pipelined adaptive decision-feedback equalizer (ADFE) architectures are developed using the relaxed look-ahead technique. This technique, which is an approximation to the conventional look-ahead computation, maintains functionality of the algorithm rather than the input-output behavior. Thus, it results in substantial hardware savings as compared to either parallel processing or look-ahead techniques. The delay relaxation, delay transfer relaxation, and sum relaxation are introduced for purposes of pipelining. Both the conventional and the predictor form of ADFE have been pipelined. The performance of the pipelined algorithms for the equalization of a magnetic recording channel is studied. It is demonstrated via simulations that, for a byte error rate of 10^-7 or less, speed-ups of up to 8 can be easily achieved with the conventional ADFE. The predictor form of ADFE allows much higher speed-ups (up to 32) for less than 1 dB of SNR degradation.

关键词： signal to noise ratio Magnetism Algorithm development Error analysis Optical filters Digital filtering Finite impulse response filters Nonlinear filtering Parallel processing Transform theory

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advanced signal processing: algorithms, architectures, and implementations V

Advanced Signal Processing: Algorithms, Architectures, and I...

引用

advanced signal processing: algorithms, architectures, and implementations V

The topics discussed are cumulants;time frequency signal analysis;mobile communications;nonlinear dynamics and signal processing;subspace tracking;array processing;fast solvers for structured systems;regularization me... 详细信息

ISBN: (纸本)0819416207

关键词： signal processing

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An efficient high-resolution time-frequency representation

An efficient high-resolution time-frequency representation

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conference on advanced signal processing algorithms, architectures, and implementations xVI

作者： Nelson, D. J. Smith, D. C. US Dept Def R61 Ft George G Meade MD 20755 USA

ISBN: (纸本)0819463922

We address the problem of efficient resolution, detection and estimation of weak tones in a potentially massive amount of data. Our goal is to produce a relatively small reduced data set characterizing the signals in the environment in time and frequency. The requirements for this problem are that the process must be computationally efficient, high gain and able to resolve signals and efficiently compress the signal information into a form that may be easily displayed and further processed. We base our process on the cross spectral representation we have previously applied to other problems. In selecting this method, we have considered other representations and estimation methods such as the Wigner distribution and Welch's method. We compare our method to these methods. The spectral estimation method we propose is a variation of Welch's method and the cross-power spectral (CPS) estimator which was first applied to signal estimation and detection in the mid 1980's. The CPS algorithm and the method we present here are based on the principles first described by Kodera et at. now frequently called the reassignment principle.

关键词： signal detection signal estimation transient signals time-frequency representations

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DECOMPOSITION OF TIME-FREQUENCY DISTRIBUTION KERNELS

DECOMPOSITION OF TIME-FREQUENCY DISTRIBUTION KERNELS

引用

CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： CUNNINGHAM, GS WILLIAMS, WJ Univ. of Michigan (United States)

ISBN: (纸本)081940943X

Cohen's class of time-frequency distributions has been recognized to have significant potential for the analysis of complicated signals. The spectrogram, though it offers comparatively lower time-frequency resolution than other, more recently investigated members of Cohen's class, is still the most broadly used TFD today. Packages are available which perform SP evaluation and offer signal synthesis from the closely related short-time Fourier transform. These packages allow the SP to be the widely accessible signal processing tool that it is. In this paper, we introduce two decompositions of TFDs, the SP decomposition and the weighted reversal correlator decomposition. The decompositions are useful for TFD interpretation, fast implementations using SP building blocks and related high-resolution, linear signal synthesis method using STFT signal synthesis building blocks. It is hoped that these decompositions will facilitate the development of TFD signal analysis/synthesis packages (using existing SP analysis/synthesis packages), and that these packages will make TFDs other than the SP accessible to a broad audience.

关键词： Surface plasmons Time-frequency analysis signal analyzers Fourier transforms Optical correlators Spectral resolution signal processing Analytical research Computer science Electrical engineering

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Progressive image decoding based on the inverse discrete cosine transform

Progressive image decoding based on the inverse discrete cos...

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conference on advanced signal processing - algorithms, architectures, and implementations VII

作者： Winograd, JM Nawab, SH Boston Univ. (United States)

ISBN: (纸本)0819425842

A new architecture is presented for incremental computation of the two-dimensional inverse discrete cosine transform (2D-IDCT) in the context of progressive image decoding. This architecture offers advantages over existing DCT inversion techniques for systems used in conjunction with progressive image coding schemes or those that must operate in environments with severe and/or time-varying resource constraints (e.g. real-time and low-power systems). The use of a bit-serial distributed arithmetic approach comprised of parallel input-pruned 2D-IDCT processing elements enables low-quality image reconstructions to be quickly and efficiently obtained using only a subset of the DCT coefficient bit stream. Initial approximate reconstructions can be improved in subsequent stages of incremental refinement according to the availability of processing resources or DCT coefficient data. Analysis is presented of image degradation at successive stages, illustrating uniform improvement according to quantitative and perceptual criteria.

关键词： progressive image decoding discrete cosine transform incremental refinement approximate processing

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TREE-STRUCTURED WAVELET TRANSFORM FOR TExTURED IMAGE SEGMENTATION

TREE-STRUCTURED WAVELET TRANSFORM FOR TEXTURED IMAGE SEGMENT...

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CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： CHANG, TH KUO, CCJ Univ. of Southern California (United States)

ISBN: (纸本)081940943X

A tree-structured wavelet transform has been developed for texture classification in our previous work. The new transform, which offers a non-redundant representation, is able to zoom into dominant frequency channels containing significant information of textures and can be interpreted as the decomposition of a 2-D function with the wavelet packet basis. In this research, we extend our work to the texture segmentation problem. A new multiscale texture segmentation algorithm based on the tree-structured wavelet transform and hierarchical fuzzy clustering technique is proposed. Numerical experiments are given to demonstrate the performance of our new algorithm.

关键词： Image segmentation Wavelet transforms Fuzzy logic Composites Digital filtering Wavelets Spatial frequencies Image processing algorithms and systems Electronic filtering Image classification

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An efficient array processor for accurate downdating of ULV decomposition

An efficient array processor for accurate downdating of ULV ...

引用

conference on advanced signal processing algorithms, architectures, and implementations xI

作者： Yoon, PA Sibul, LH Trinity Coll Dept Comp Sci Hartford CT 06106 USA

ISBN: (纸本)0819441880

We present an efficient array processor for downdating the ULVD. The array processor exploits the block structure of the decomposition to determine the effective rank at every step of modification and maintains the rank-revealing nature of the decomposition throughout the steps by tracking exact quantities of Frobenius norms of all three blocks of the lower triangular factor in the decomposition. Thus. a deflation step that is necessary to compute its numerical rank can be often avoided. This feature of the algorithm is particularly attractive to its array processor implementation because the deflation steps usually require some condition estimation. and most of good condition estimators are not well pipelined.

关键词： signal processing null space rank detection array processors

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Some effects of mutual coupling and noise on channel capacity between antenna arrays

Some effects of mutual coupling and noise on channel capacit...

引用

advanced signal processing algorithms, architectures, and implementations xV

作者： Gans, M.J. Air Force Research Laboratories IFGC 525 Brooks Road Rome NY 13441 United States

No abstract available

关键词： Antennas Amplifiers Interference (communication) Scattering Transmitters Polarization Receivers Wave propagation Radio propagation signal to noise ratio

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Time-varying frequencies of a signal

Time-varying frequencies of a signal

引用

conference on advanced signal processing - algorithms, architectures, and implementations VII

作者： Loughlin, PJ Univ. of Pittsburgh (United States)

ISBN: (纸本)0819425842

We consider the definition and interpretation of instantaneous frequency and other time-varying frequencies of a signal, and related concepts of instantaneous amplitude, instantaneous bandwidth and the time-varying spectrum of a signal. A definition for the average frequency at each time is given, and we show that spectrograms and Cohen-Posch time-frequency distributions can yield this result for the first conditional moment in frequency. For some signals this result equals the instantaneous frequency, but generally instantaneous frequency is not the average frequency at each time in the signal. We discuss monocomponent versus multicomponent signals, and give an estimate of the time-varying spectrum given the instantaneous frequencies and bandwidths of the components. We also consider the role of the complex signal in defining instantaneous amplitude, frequency and bandwidth, and ways to obtain a complex signal satisfying certain physical properties, given a real signal (or its time-varying spectrum). Depending upon the physical properties desired (e.g., the instantaneous amplitude of a magnitude-bounded signal should itself be bounded), one obtains different complex representations - and hence different instantaneous amplitudes, frequencies and bandwidths - of the given signal.

关键词： instantaneous frequency, bandwidth Hilbert transform analytic signal time-frequency conditional moments maximum entropy density

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SEGMENTATION AND CLASSIFICATION OF NASAL PHONEMES BASED ON THEIR TIME-FREQUENCY REPRESENTATION

SEGMENTATION AND CLASSIFICATION OF NASAL PHONEMES BASED ON T...

引用

CONF ON advanced signal-processing algorithms, architectures, AND implementations

作者： VELEZ, E ABSHER, R Simon Fraser Univ. (Canada) Univ. of Vermont (United States)

ISBN: (纸本)0819404098

Time-frequency analysis of speech provides detailed information which may be used for the study of its production mechanisms and for recognition purposes. The smoothed Wigner-Ville distribution can be used as an effective speech analysis tool when a high temporal resolution is required. Smoothing demands a careful balance between resolution and suppression of interferences in the distribution while taking into account the characteristics of the speech signal. The resulting representation is applied to analyze nasal phonemes and transitions in continuous speech and shown to unveil important transitory features not revealed by the spectrogram and to result in accurate segmentation and discrimination of their place of articulation.

关键词： Smoothing Time-frequency analysis Temporal resolution signal analyzers Analytical research Image segmentation signal attenuation Spectral resolution Shape analysis Statistical analysis

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