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《射频微波工程百科全书 》(Encyclopedia of ...

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FREQUENCY MODULATION 1691

FREQUENCY MODULATION
L. B. FERTIG J. H. MCCLELLAN
Georgia Institute of Technology

Frequency-modulated waveforms are commonly utilized for information transmission in radiocommunications, as well as for environmental sensing in radar, sonar, and bioengineering. In many of these situations, the desired information is extracted from the received signal by monitoring one or more dominant frequencies in the signal and examining their variation as a function of time. The process by which a local approximation to a signal’s frequency is obtained is known as instantaneous frequency estimation (IFE). In this article, concepts relating to instantaneous frequency, along with algorithms for its computation, are reviewed. First, several means by which instantan……
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