资料介绍
70539_06fPrevious Page
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
我要上传