FFT, Phase Shift Keying.

Cuthbert Nyack
A PSK signal consisting a sinusoidal carrier at w1 whose phase is switched between 0° and f° at a rate w2.

When f° = 180° then the frequency spectrum consists of the 2 sided spectra of a square pulse train without a component at the carrier frequency. For f° different from 180°, the carrier is present.
This spectrum is narrower than that of an FSK signal.

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COPYRIGHT 2007 Cuthbert Nyack.