Glossary Definition for QPSK

Definition

QPSK Symbol Constellation

Quadrature Phase Shift Keying (QPSK) is a form of Phase Shift Keying in which two bits are modulated at once, selecting one of four possible carrier phase shifts (0, 90, 180, or 270 degrees). QPSK allows the signal to carry twice as much information as ordinary PSK using the same bandwidth. QPSK is used for satellite transmission of MPEG2 video, cable modems, videoconferencing, cellular phone systems, and other forms of digital communication over an RF carrier.

See our QPSK tutorial: QPSK Modulation Demystified.

Synonyms

• Quaternary Phase Shift Keying
• 4-PSK
• Quadrature Phase Shift Keying
• Quadriphase Phase Shift Keying

Keywords

QPSK, Quaternary Phase Shift Keying, 4-PSK, Quadrature Phase Shift Keying, Quadriphase Phase Shift Keying

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