Quadrature phase shift keying (quadrature phase shift keyin, QPSK) is a digital modulation. It is divided into absolute and relative phase shift of the phase shift of two. Because of the absolute phase shift way of phase ambiguity, so in practice mainly uses the relative phase shift dqpsk. has been widely used in wireless communication, a a very important way of modulation and demodulation in modern communication.

qpsk.m
T2F.m

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