Results 241 to 250 of about 1,952,937 (282)

Variable frequency evolutionary spectrum

1995 International Conference on Acoustics, Speech, and Signal Processing, 2002
Evolutionary spectral theory provides a means for defining a decomposition of signal energy jointly over time and frequency for processes which exhibit an oscillatory behavior. The oscillatory model of behavior effectively assumes that a process is composed sinusoidal components with slowly-varying time-dependent amplitudes.
C. S. Detka, Amro El-Jaroudi
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Evolutionary radiation and the spectrum of consciousness

Consciousness and Cognition, 2009
Evolution is littered with polyphyletic parallelism: many roads lead to functional Romes. We propose consciousness embodies one such example, and represent it here with an equivalence class structure that factors the broad realm of necessary conditions information theoretic realizations of Baars' global workspace model.
Robert G, Wallace, Rodrick, Wallace
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Relating the bilinear distributions and the evolutionary spectrum

IEEE International Conference on Acoustics Speech and Signal Processing, 1993
The authors present the theoretical relationship connecting the short time Fourier transform (STFT), the class of bilinear distributions (BDs) and the evolutionary periodogram to the Wold-Cramer evolutionary spectrum. They show that the STFT and the BD can be viewed as estimators of the evolutionary spectrum, thereby allowing comparison of the various ...
C. S. Detka, Amro El-Jaroudi, Luis F. Chaparro   +2 more
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Location-oriented evolutionary games for spectrum sharing

2014 IEEE Global Communications Conference, 2014
Spectrum sharing between primary users (PUs) and secondary users (SUs) can be realized using economic approaches. In this paper, we propose a method for multiple PUs to share with multiple SUs different idle channels in overlapped licensed areas. Due to the fluctuations of supply and demand in different areas, the SUs are grouped according to their ...
Feixiang Zhang, Xiangwei Zhou
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Evolutionary spectrum estimation by positivity constrained deconvolution

IEEE Transactions on Signal Processing, 1999
We present a deconvolution technique to obtain the evolutionary spectrum (ES) of nonstationary signals by deconvolving the blurring effects of the time-frequency distribution (TFD) kernel from bilinear TFDs. The resulting spectrum is non-negative and has desirable properties such as higher resolution and higher concentration in time frequency.
Mustafa K. Emresoy, Amro El-Jaroudi
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Evolutionary conservation and mutational spectrum of BMPR2 gene

Gene, 2006
A variety of mutations in the bone morphogenetic protein receptor type 2 (BMPR2) have been identified in patients with pulmonary arterial hypertension. In this study, using our BMPR2 mutation database and BMPR-II protein sequences from eight distantly related species, we defined the relationship among evolutionary conservation, mutation frequency and ...
Wai K P, Wong, Jane H, Morse, James A, Knowles   +2 more
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A multidimensional approach to evolutionary spectrum estimation

Proceedings of the 32nd Midwest Symposium on Circuits and Systems, 2003
Smoothing of the Wigner distribution introduces two-dimensional sequences which bring the theory of two-dimensional filter analysis and design to the one-dimensional time-varying spectrum estimation. In this study, the region of support of the two-dimensional filters associated with the commonly used periodogram, averaged periodograms, and Wigner ...
M.G. Amin, M.T. Schiavoni
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Sonar spectrum recognition chip designed by evolutionary algorithm

IJCNN'99. International Joint Conference on Neural Networks. Proceedings (Cat. No.99CH36339), 2003
An evolutionary design methodology for sonar spectrum recognition chip is proposed and the prototype chip is developed. In the design, sonar spectrum data are transformed to truth-tables and the truth-tables are evolved to obtain generalization capability by using genetic algorithms.
Moritoshi Yasunaga, Taro Nakamura, Ikuo Yoshihara   +2 more
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Cognitive Radio, Spectrum, and Evolutionary Heuristics

IEEE Communications Magazine, 2018
Shortage of free spectrum is a critical problem in deploying new wireless systems, and no standard frequency assignment mechanism exists for cognitive radio systems at present. In this tutorial, we treat that problem in a holistic way, as a part of solving a puzzle of selection of changeable characteristics of system devices.
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Adaptive evolutionary spectrum analysis for narrow band signals

ICASSP '87. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005
This paper presents several structures for Adaptive Notch Filters and implementation aspects of constrained ARMA models. These ANF suit very well to evolutionary spectrum analysis for sinusoidal signals in additive noise. colored or white. Several estimation algorithms may be applied with these structures (ELS,RML,RIV) and some special procedures may ...
Nacer K. M'Sirdi, I. D. Landau
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