Hi Mason,
... The amplitude of the receiver output seems to spray out pretty
widely from the constellation point intended.
It could be an AGC issue---is the AGC time constant long compared with a
symbol?
Is the distribution of constellation points uniform (each is picked with
equal
probability)?
One thing you could try, if the channel permits, is to temporarily hold
the AGC
fixed to see if that gives a better constellation (perhaps at the wrong
size;
or if you're using decision feedback, try to get it to the right size :-) ).
Cheers,
Peter Monta
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