Definitions for "Phase shift keying"
A modem digitally modulates the phase of a signal's RF carrier for the purpose of transmitting information.
In digital transmission, angle modulation in which the phase of the carrier is discretely varied in relation either to a reference phase or to the phase of the immediately preceding signal element, in accordance with data being transmitted
A digital modulation technique whereby the phase of a carrier frequency is shifted to represent a digital "1" or "0" state. In "Quadri-phase-shift keying" systems, the phase angle locations of 0°, ±90°, and 180° are used as reference points to represent sixteen possible digital states (24).