Here’s a brief write-up on the tests I ran for the AGC loops. It looks
the feedforward has a slight advantage over most of the test cases.
I thought I’d email this to the listserv in case anyone is interested in
digital modulations. Basically, we’re working on getting stable DBPSK
DQPSK modulators into the code base. The AGC loops seems to be producing
problems, much of which is caused by driving the Costas loop crazy at
next stage of the receiver. Future work will include creating a
receiver for the differential modulations to take out the Costas loop.