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Fig. 3 a The time-frequency plane divided by time-frequency cells.

Typically, time-varying channels are characterized by time and frequency dispersions.

(c) time frequency distribution.

polynomial time frequency transform.

b The time-LCD-frequency plane divided by time-LCD-frequency cells.

In the following, we discuss the time and frequency domains followed by the time-frequency domain.

First, by using time-frequency analysis we obtain the energy distribution of signal frequency content in time.

The concept of time-frequency filtering is proposed by Boashash B, and it mainly realizes the filtering in time-frequency domain with the time-frequency filter established [23].

"If it all sounds horribly icky," Stephen Holden wrote in The New York Times, " 'Frequency' gets away with much of its sentimentality simply by piling it on so aggressively".

Short-time frequency transform.

Therefore, the examination of stationarity is performed by using the time-frequency-based instantaneous frequency estimation.