phase-shift
Alternative names
phase shift
Synonyms
Examples
Differential phase-shift keying (DPSK) Differential encoding main Differential phase shift keying (DPSK) is a common form of phase modulation that conveys data by changing the phase of the carrier wave.
In the constellation diagram shown on the right, it can be seen that this will limit the phase-shift to no more than 90° at a time.
Manchester encoding as phase-shift keying Manchester encoding is a special case of binary phase-shift keying (BPSK), where the data controls the phase of a square wave carrier whose frequency is the data rate.
Since this scheme depends on the difference between successive phases, it is termed differential phase-shift keying (DPSK).
The chipping code is combined with the data using exclusive or before transmitting using binary phase-shift keying or a similar modulation method.
The first image below is the eye pattern for a binary phase-shift keying (PSK) system in which a one is represented by an amplitude of -1 and a zero by an amplitude of +1.