This feels like a real basic question but I'm struggling to find a clear answer.

I have PSK signal that subjected to a fixed phase shift noise, introduced between the transmitter and receiver - so the received signal has a constant phase shift from the expected signal without noise.

The question is how to compensate for this - on the constellation diagram in Matlab the constellations are rotated, but in the physical system I understand that there will be a Phase Locked Loop in the receiver. Won't this simply lock onto the zero crossings in the phase shifted signal, effectively removing the phase offset noise.

What am I missing?

What other options are there for removing the fixed phase offset noise?


  • $\begingroup$ Isn't this purely a synchronization issue? A spurious constant phase offset is the same as a delay mismatch. And synchronization of receiver to the transmitter is how we deal with a delay or phase mismatch. I had always thunked that sync'ing can be done with frame sync words, sometimes called "preambles". $\endgroup$ Dec 5, 2023 at 19:52
  • 1
    $\begingroup$ Thanks - that makes sense! $\endgroup$
    – Dr_Chris
    Dec 7, 2023 at 10:16


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