نتایج جستجو برای: digital instantaneous frequency
تعداد نتایج: 789354 فیلتر نتایج به سال:
There is hardly a more pervasive trend in the world today than communications. The momentum towards anytime, anywhere and any-type of communication is fueled by advances in radio frequency technology, near-exponential sales of laptop computers and personal digital assistants (PDAs), as well as new models of business that expect and rely on instantaneous information availability. The commonly ro...
S U M M A R Y We infer shear attenuation in the lower mantle by using the method of instantaneous frequency matching to calculate differential t∗ between core-reflected ScS and direct S (δt∗ScS−S). The instantaneous frequency at the envelope peak of a seismic phase is related to the average Fourier spectral frequency of that phase. To estimate δt∗ScS−S for a given trace, we first calculate the ...
Automatic modulation identification plays an important role in non-cooperative communication systems. An improved approach, based on instantaneous features and binary tree classifier has been proposed for the classification of Medium Frequency (IF) digital signals at low signal-to-noise ratio (SNR) situation. Mean filter was applied to suppress the noise and five new characteristic parameters s...
The aim of this paper is to present a new method for the estimation of the instantaneous frequency of a frequency modulated signal, corrupted by additive noise. Any time-frequency representation of an acquired signal is concentrated around the instantaneous frequency law of its useful component (the projection of the ridges of the time-frequency representation on the time-frequency plane) and r...
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