phase-shift keying

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phase-shift keying

[′fāz ¦shift ‚kē·iŋ]
A form of phase modulation in which the modulating function shifts the instantaneous phase of the modulated wave between predetermined discrete values. Abbreviated PSK.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

phase modulation

Varying the angle of a wave in a carrier in order to transmit analog or digital data. For digital signals, phase modulation (PM) is widely used in conjunction with amplitude modulation (AM). For example, quadrature amplitude modulation (QAM) uses both phase and amplitude modulation to create different binary states for transmission (see QAM). See modulation and carrier.

Vary the Angle
In PM modulation, the angle of the carrier wave is varied by the incoming signal. In this example, the modulating wave implies an analog signal.

Digital Phase Shift Keying (PSK)
For digital signals, phase shift keying (PSK) uses two phases for 0 and 1 as in this example. See DPSK.
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References in periodicals archive ?
In this study, the chaotic sequence is introduced into the MCPC pulse train so as to design the Chaos_NNS MCPC_I and Chaos_NNS MCPCJI pulse train signal based on chaotic biphase modulation. We compare the ambiguity function of the signal proposed in this paper with that of MCPC pulse train modulated by P4 code and analyze the influences of the subcarrier number, bit number, and period number on the autocorrelation performance of the two signals.
It consists of a very long sequence of pseudorandom binary biphase modulations on the GPS carrier at a chip rate of 10.23 MHz which repeats about every 267 days.