I am using a Costas loop for carrier recovery with QAM16 data. The carrier is
only 2khz. The I/Q output of the Costas loop seems to track (the original
sin/cos of the modulating carrier's Frequency & Phase) steadily for a long
period (minutes) and then the Phase moves off, normally in +/- 45 or 90
degrees in one or both of the phases. Any thoughts on why this occurs or how I
can fix this issue?
Thanks...Tom
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