quadrature phase-shift keying


Also found in: Acronyms.

quadrature phase-shift keying

[¦kwäd·rə·chər ′fāz‚shift ‚kē·iŋ]
(communications)
Phase-shift keying in which four different phase angles are used, usually spaced 90° apart. Abbreviated QPSK. Also known as quadriphase; quaternary phase-shift keying.
References in periodicals archive ?
Complex modulation formats such as binary phase-shift keying, quadrature phase-shift keying and 64 quadrature amplitude modulation required for testing RF digital communications systems may be accomplished by driving the I/Q inputs with analog signals.
Alternatively, a parallel for MSK modulation can be derived that is equivalent to offset quadrature phase-shift keying modulation with sinusoidal baseband pulse shaping.[9]
Another example is channel sounders that employ a spread spectrum technique to study the amplitude and phase characteristics of a propagation channel.[2] The channel sounder is usually a pair of devices: a transmitter that outputs a is channel sounders that employ a spread spectrum technique to study the amplitude and phase characteristics of a propagation channel.[2] The channel sounder is usually a pair of devices: a transmitter that outputs a spread spectrum biphase-shift keying or quadrature phase-shift keying modulated RF signal and a correlating receiver that monitors the distortions of a correlation peak due to multipaths and fading.
For example, a quadrature phase-shift keying (QPSK) signal can be examined to determine how different values of a affect the vector diagram.
The digital communication formats include spread spectrum, quadrature amplitude modulation, AM and quadrature phase-shift keying modulation schemes.
The model BAFL-28000G.d Ka-band linearizer decreases the spectral regrowth of single-carrier quadrature phase-shift keying and digitally modulated signals.
A second data modulation format, offset quadrature phase-shift keying (OQPSK), is favored due to its ease of implementation and relatively constant carrier envelope.
Figure 3 shows the display of [Pi]/4-digital quadrature phase-shift keying (DQPSK) modulation error in the form of a constellation diagram.

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