phase shift
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. Source: Internet
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. Source: Internet
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. Source: Internet
Since this scheme depends on the difference between successive phases, it is termed differential phase-shift keying (DPSK). Source: Internet
The chipping code is combined with the data using exclusive or before transmitting using binary phase-shift keying or a similar modulation method. Source: Internet
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. Source: Internet