5.4 Phase Shift Keying (PSK)

Principle of PSK

With Phase Shift Keying (PSK), the information is contained in the instantaneous phase of the modulated carrier. Usually this phase is imposed and measured with respect to a fixed carrier of known phase – coherent PSK. For binary PSK, phase states of 0o and 180o are used.

It is also possible to transmit data encoded as the phase change (phase difference) between consecutive symbols. This method is classified as  Differentially Coherent PSK (DSPK).

There is no non-coherent detection equivalent for PSK.