The phase of the output signal gets shifted depending upon the input. These are mainly of two types, namely Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK), according to the number of phase shifts. The other one is Differential Phase Shift Keying (DPSK) which changes the phase according to the previous value.

Digital Modulation Techniques Basic Concepts
Digital Modulation Techniques Basic Concepts\Basic Concepts of Digital Modulation [23Sep2017].zip

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