Hi,
The rrc filter parameters in the new modulation scheme in dbpsk2
confuses
me. Why is the symbol rate in dbpsk2 equal to "
1.0/float(self._samples_per_symbol) " whereas, in dbpsk it was 1.0?
Thanks,
Mir
On Thu, Nov 11, 2010 at 8:02 PM, John A. [email protected]
wrote:
Hi,
The rrc filter parameters in the new modulation scheme in dbpsk2 confuses
me. Why is the symbol rate in dbpsk2 equal to "
1.0/float(self._samples_per_symbol) " whereas, in dbpsk it was 1.0?Thanks,
Mir
It’s because we are now using a polyphase filterbank clock recovery
scheme. The PFB takes in a filter prototype and distributes it over
the N-arms of the filterbank. Since we’re doing filtering here, I
figured we might as well do the RRC filtering at the same time. So, to
get the prototype set up for the filterbank, you have to rethink how
you structure it. This change is part of that.
Tom