QPSK， quadrature phase shift keying

QPSK Quaternary Phase Shift Keying

QPRSquadrature phase shift keying

QDPSK Quadrature Differential Phase – Shift Keying

QAquadrature phase shift keying

PLL-QPSK， phased-locked loop quadrature phase shift keying

phase shift keying rule

phase shift keying PSK

phase shift keying modulator demodulator

phase shift keying

phase reversal keying

phase frequency spectrum

Phase frequency response

phase frequency distortion

phase frequency detector

phase frequency detecter

phase frequency characteristics