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PSK is embedding info in the phase of transmitted signal. DPSK sends the phase differences between BPSK info symbols in order to allow for incoherent demodulation (the phase is not needed but only phase differences needed).
Differential phase shift keying is a non coherent form of phase shift keying which avoids the need for a coherent reference signal at the receiver. Further PSK needs coherent detection due to its phase shift with a refrence signal. you should keep in mind that no coherent receivers are easy and cheap to build.
the reason behind non-coherent detection of DPSK is because its phase changes with its own delayed signal,nd we generally use this technnique.