Matt Ettus wrote:

> On the other hand, since it is differential, you usually don't use a
> costas loop with pi/4-DQPSK.

Is there a different way to assure frequency/phase lock, or are they not
needed?  I know for differential detection constellation doesn't need to
be locked in the correct absolute phase, but is it the case it can be
left to rotate as well?

-Johnathan


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