By frequency-domain analysis one generally means an analysis of systems based on representing input and output as linear combinations of sinusoidal functions. Such an analysis is most useful for studying the steady-state behavior of linear and time-invariant systems. In terms of noise analysis, the frequency-domain approach is especially useful in communication problems, where the steady-state behavior is generally the main thing of interest. In control problems the dynamical or transient behavior of the systems is of greater importance. There, frequency-domain analysis loses some of its effectiveness. We take up the dynamical approach in Chapter 6.
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