# phase-shift keying

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## phase-shift keying

[′fāz ¦shift ‚kē·iŋ]
(communications)
A form of phase modulation in which the modulating function shifts the instantaneous phase of the modulated wave between predetermined discrete values. Abbreviated PSK.

## 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.
References in periodicals archive ?
The function of BPSK block is binary phase shift keying modulating of the output stream from the previous stage.
The phase shift keying appears to be very resistant against nonlinear effects, because the envelope of signal is constant.
Quadrature phase shift keying (QPSK), however, uses four phase values spaced at [pi]/2 intervals to encode two bits per symbol.
This process is basically independent of the modulation content of the desired carrier; analog amplitude modulated (AM), frequency modulated (FM), digital frequency shift keying (FSK) or quadrature phase shift keying (QPSK).
The most practical and desirable breakthrough technology was the multi-level digital coherent technology with quadrature phase shift keying (QPSK) and quadrature amplitude modulation (QAM).
In the system's first channel optical signal is transmitted for which modulation differential phase shift keying with non-return-to-zero encoding technique is used (NRZ-DPSK).
One example is the use of dual-polarization differential quadrature phase shift keying (DP-DQPSK) modulation.
The black dots indicate the four nominal quadrature phase shift keying (QPSK) symbol positions resulting from progressive 90-degree phase shifts.
The joint research will enable ultra-high-speed 400Gbps-class optical transmissions through the use of dual-polarization quadrature phase shift keying (DP-QPSK)(3), which is currently in use for 100Gbps transmissions, together with dual-polarization 16 quadrature amplitude modulation (DP-16QAM)(4), which takes advantage of an even greater number of quadrature carriers.
The results of simulation of modified synchronous phase detector showed the possibility of an increase of noise immunity of receiving signals with phase shift keying and the ability of the modified PLL for detecting OQPSK signals even when signal strength is less than the capacity of obstacles.
Xtera said its NXT Submarine Line Terminal Equipment (SLTE) with advanced 20Gb/s Differential Phase Shift Keying (DPSK) technology has been selected for the Americas I North and Columbus 2b upgrade.

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