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In abs. PSK only instant phase for the incoming bits are considered.

For DPSK, the difference between previous phase and the present phase is considered.

Example: If BPSK is used, then for 0 if phase if pi and for 1 it is 0, then

for abs. BPSK the phase states for the bit stream 1010 will be 0,pi,0,pi

for DPSK, we assume initial phase is zero and a rule that , if incoming bit is zero, then phase difference is 0 and if it is 1 then, phase difference is pi.

So, phase difference will be--pi,0,pi,0

Instant phase will be, pi,pi,0,0....Easy!!

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Q: Difference between absolute PSK and differential PSK?
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