PSK

Phase-Shift Keying

Modulation is done by varying the pĥase.

There are several types of PSK modulations based on how many phases are used:

BPSK

Binary Phase-Shift Keying. A PSK modulation with only two phases.

Operation	Constellation Diagram

DPSK

DPSK is a phase modulation that uses the previous symbol’s phase to encode the current symbol.

QPSK

Quadrature Phase-Shift Keying (also called 4-PSK).

A PSK modulation with four different phases.

Operation	Constellation Diagram