Quadrature phase shift keying is a kind of digital modulation method. It is divided into two types, the absolute phase shift and the relative phase shift. Because of the phase ambiguity of the absolute phase shift method, the relative phase shift mode is adopted in practice DQPSK. At present, widely used in wireless communication, has become a very important modern communication modulation and demodulation.

qpsk\QpskMod.m
qpsk

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