Wireless Technology Terms, Glossary and Dictionary

QPSK: Quadrature Phase Shift Keying

Quadrature Phase Shift Keying (QPSK) is a digital modulation scheme that conveys data by changing, or modulating, the phase of a reference signal (the carrier wave). Sometimes known as quaternary or quadriphase PSK or 4-PSK, QPSK uses four points on the constellation diagram, equispaced around a circle. With four phases, QPSK can encode two bits per symbol, shown in the diagram with Gray coding to minimize the BER.

Related Terms

QPSK: Quadrature Phase Shift Keying