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

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signal arrival times

Signal arrival times

引用

conference on advanced signal processing algorithms Architectures and Implementations XIII

作者： Hughes, DH USAF Res Lab Ctr Integrated Transmiss & Exploitat Rome NY 13441 USA

ISBN: (纸本)0819450782

A femtosecond electromagnetic pulse propagating in a linear dispersive medium is analyzed in phase spaces of (space, wave number) and (time, frequency). First moment densities are computed as eigenvalues of differential operators acting on Hilbert ray representations of the pulse in relevant domains. These moment densities are used as metrics in the relevant phase spaces to measure the local mean values and their deviations in position and wavenumber, and in time and frequency. For example, arrival times of the pulse over its spectral content are computed as the mean arrival time at a particular frequency to within one half the local deviation at that frequency. These metrics on the pulse are compared to the relevant phase space Wigner distribution.

关键词： space-time signal analysis local moments Wigner distribution time-frequency dispersion wave propagation FDTD moment densities instantaneous frequency

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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...

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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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Time-frequency analysis for the study of phase synchrony in the brain

Time-frequency analysis for the study of phase synchrony in ...

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conference on advanced signal processing algorithms, Architectures, and Implementantions XVIII

作者： Aviyente, Selin Evans, Westley Michigan State Univ E Lansing MI 48824 USA

ISBN: (纸本)9780819472946

The quantification of synchrony is important for the study of large-scale interactions in the brain. Current synchrony measures depend on the energy of the signals rather than the phase, and cannot be reliably used as measures of neural synchrony. Moreover, the current methods are insufficient since they are limited to pairs of signals. These approaches cannot quantify the synchrony across a group of electrodes and over time-varying frequency regions. In this paper, we propose two new measures for quantifying the synchrony between both pairs and groups of electrodes using time-frequency analysis. The proposed measures are applied to electroencephalogram (EEG) data to quantify neural synchrony.

关键词： Phase measurement Time-frequency analysis Brain Electrodes Electroencephalography Mode locking Wavelets Iterated function systems signal analyzers Wavelet transforms

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Application of time-frequency analysis methods to speaker verification

Application of time-frequency analysis methods to speaker ve...

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conference on advanced signal processing algorithms, Architectures, and Implementations XVI

作者： Williams, W. J. Bossemeyer, R. W. Quantum Signal LLC Ann Arbor MI 48176 USA Univ Michigan EECS Ann Arbor MI 48109 USA Speech Technol Appl Res Inc St Charles IL USA

ISBN: (纸本)0819463922

Time-Frequency Analysis has previously been successfully applied to characterize and quantify a variety of acoustic signals, including marine mammal sounds. In this research, Time-Frequency analysis is applied to human speech signals in an effort to reveal signal structure salient to the biometric speaker verification challenge. Prior approaches to speaker verification have relied upon signal processing analysis such as linear prediction or weighted Cepstrum spectral representations of segments of speech and classification techniques based on stochastic pattern matching. The authors believe that the classification of identity of a speaker based on time-frequency representation of short time events occurring in speech could have substantial advantages. Using these ideas, a speaker verification algorithm was developed(1) and has been refined over the past several years. In this presentation, the authors describe the testing of the algorithm using a large speech database, the results obtained, and recommendations for further improvements.

关键词： time-frequency speaker verification multimodal biometrics homeland security pattern recognition

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Performance of coherent adaptation algorithms for the WCDMA smart antenna system in Rayleigh flat-fading channel

Performance of coherent adaptation algorithms for the WCDMA ...

引用

conference on advanced signal processing algorithms, Architectures, and Implementations XI

作者： Kong, DG Lee, K Chun, J Choi, P Yun, JC Lee, SJ Lee, JH Samsung Adv Inst Technol Human Comp Interact Lab Suwon South Korea

ISBN: (纸本)0819441880

Coherent adaptation algorithms are proposed for a beamformer in the WCDMA reverse link. The coherent adaptation algorithm improves the convergence speed by constraining the desired signal component of the filtered output to be always coherent in phase with the reference signal at each iteration. With the coherent constraint, the performance of coherent methods is significantly improved. We present the simulation results that show the various desirable characteristics of coherent methods such as a fast convergence speed. insensitiveness to fading parameters over conventional methods.

关键词： coherent adaptation algorithm smart antenna WCDMA array signal processing

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Modern microphone array for hearing aid and speech processing 6

Modern microphone array for hearing aid and speech processin...

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conference on advanced signal processing algorithms, Architectures, and Implementations VI

作者： Wang, A Yao, K Hudson, RE Korompis, D Lorenzelli, F Soli, SD Gao, S UNIV CALIF LOS ANGELES DEPT ELECT ENGNLOS ANGELESCA 90095

ISBN: (纸本)0819422347

For various audio, teleconference, hearing aid, and voice recognition applications, a microphone array is known to be an effective method to enhance the SNR in noisy environments resulting in significant improvement of speech intelligibility or recognition. We propose an novel electronically steerable microphone array based on the Maximum Energy concentration criterion to form a focused beam toward the desired speech source, attenuating background noises and rejecting discrete spatial interferers. The design and implementation of a prototype DSP-based microphone array system are described. Some details on microphone measurement, calibration, and optimization needed to achieve a high performance microphone array are discussed. Computer simulated and measured array performances are presented to show the effectiveness of the array system.

关键词： Sensors Calibration signal to noise ratio Digital signal processing Computer simulations Near field Acoustics Computing systems signal processing Speaker recognition

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Distributed On-Demand Routing for LEO Mega-Constellations: A Starlink Case Study 11

Distributed On-Demand Routing for LEO Mega-Constellations: A...

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11th advanced Satellite Multimedia Systems conference / 17th signal processing for Space Communications Workshop (ASMS/SPSC)

作者： Stock, Gregory Fraire, Juan A. Hermanns, Holger Univ Saarland Comp Sci Saarland Informatics Campus D-66123 Saarbrucken Germany

ISBN: (数字)9781665473774

ISBN: (纸本)9781665473774

The design and launch of large-scale satellite networks create an imminent demand for efficient and delay-minimising routing methods. With the rising number of satellites in such constellations, pre-computing all shortest routes between all satellites and for all times becomes more and more infeasible due to space and time limitations. Even though distributed on-demand routing methods were developed for specific LEO satellite network configurations, they are not suited for increasingly popular mega-constellations based on Walker Delta formations. The contributions of this paper are twofold. First, we introduce a formal model that mathematically captures the time-evolving locations of satellites in a Walker Delta constellation and use it to establish a formula to compute the minimum number of ISL hops between two given satellites. In the second part, we present an on-demand hop-count-based routing algorithm that approximates the optimal path while achieving superior performance compared to classical shortest-path algorithms like ***.

关键词： Satellites Space communications Multimedia systems conferences signal processing algorithms Low earth orbit satellites signal processing

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MULTI-CORE PLATFORMS FOR signal processing: SOURCE AND CHANNEL CODING

MULTI-CORE PLATFORMS FOR SIGNAL PROCESSING: SOURCE AND CHANN...

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IEEE International conference on Multimedia and Expo

作者： Sousa, Leonel Momcilovic, Svetislav Silva, Vitor Falcao, Gabriel Univ Tecn Lisboa INESC ID ISTElect & Comp Engn Dept Lisbon Portugal Univ Coimbra Dept Elect & Comp Engn P-3000 Coimbra Portugal

ISBN: (纸本)9781424442904

In this paper we propose to show how signal processing algorithm designers can understand the nuances of multi-core computing engines in order to conveniently exploit these powerful devices. This is illustrated by presenting source and channel coding, two fundamental operations in multimedia signal processing. We describe methods and principles to develop parallel signal processing algorithms to compute motion estimation for advanced Video Coding, and Low-Density Parity-Check code decoding for forward error correction in the channel coding context. The paper will consider general purpose multi-core architectures and accelerators such as the Cell/B.E. and graphics processing units. Experimental evaluation of the multi-core systems allows their performance for signal processing applications to be compared side by side with previous hardware dedicated solutions.

关键词： Multi-core signal processing coding

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Space-time adaptive processing and subband array implementations

Space-time adaptive processing and subband array implementat...

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conference on advanced signal processing algorithms Architectures and Implementations XIII

作者： Zhang, YM Yang, KH Amin, MG Villanova Univ Ctr Adv Commun Villanova PA 19085 USA

ISBN: (纸本)0819450782

Inter-symbol interference (ISI) and co-channel interference (CCI) are two major sources to signal impairment in mobile communications. To suppress both ISI and CCI, space-time adaptive processing (STAP) systems are shown to be effective, leading to increased capacity and improved quality of service. The high complexity and slow convergence, however, are often the hurdles in practical implementation of the STAP systems. Several subband array implementations have been proposed for STAP over the past a few years. These methods are to provide optimal or sub-optimal steady state performance with reduced implementation complexity and improved convergence performance. The purpose of this paper is to investigate the steady state performance of subband arrays with different decimation rates and to derive analytical expressions of the minimum mean square error (MMSE). The discrete Fourier transform (DFT) based subband arrays and both unconstrained and constrained weight adaptations are considered.

关键词： space-time adaptive processing subband array filter banks array processing mobile communication inter-symbol interference co-channel interference

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A High-Performance signal processing System for Monopulse Tracking Radar

A High-Performance Signal Processing System for Monopulse Tr...

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International conference on Manufacturing Science and Technology (ICMST 2011)

作者： Hong, Yong-bin Xu, Cheng-fa Gao, Mei-guo Zhao, Li-zhi Beijing Inst Technol Dept Elect Engn Beijing 100081 Peoples R China

ISBN: (纸本)9783037852958

A radar signal processing system characterizing high instantaneous dynamic range and low system latency is designed based on a specifically developed signal processing platform. Instantaneous dynamic range loss is a critical problem when digital signal processing is performed on fixed-point FPGAs. In this paper, the problem is well resolved by increasing the wordlength according to signal-to-noise ratio (SNR) gain of the algorithms through the data path. The distinctive software structure featuring parallel pipelined processing and "data flow drive" reduces the system latency to one coherent processing interval (CPI), which significantly improves the maximum tracking angular velocity of the monopulse tracking radar. Additionally, some important electronic counter-countermeasures (ECCM) are incorporated into this signal processing system.

关键词： Monopulse instantaneous dynamic range system latency ECCM

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