Could the "decay" you are seeing actually be the phase changing due to offsets in the carrier frequency? Unless you are doing some kind of phase-locking on the RX signal to correct for frequency differences between the transmitter and receiver, the apparent phase will drift a bit. Especially over a 200microsecond step.
(Consider that you're symbol time is about 0.8 mSec... Now assume that the accuracy of your carrier is 100 ppb. That says you could be off by 200Hz or so. In 1 mS you will have drifted (seen a phase shift) of 0.4pi radians. Does that make sense? matt
_______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
