|Subject:||Re: [Discuss-gnuradio] Rectangular Pulse Shape w/ PFB Clock Sync|
|Date:||Wed, 28 Sep 2016 09:41:39 -0400|
I haven’t tried it myself, but wouldn’t using a raised cosine or Gaussian filter for your taps still provide some pulse shaping for the PFB clock sync to track? You’re essentially leap-frogging the RRC matched filters at transmitter and receiver, and placing the entire burden at the receiver, but at the decision point of the clock synch the end result should be the same.
I have tried to use PFB clock sync without success on rectangular pulses as well. Presumably you've seen the documentation  on nfilts and taps. I tried making the filter a rectangular pulse with x sps upsampled by nfilts. One theory I have is that the polyphase clock sync may not work with rectangular pulses. If you read the paper, the derivative of the pulse is required. Perhaps that's a problem since for typical RRC pulses the derivative is well defined but for a rectangular pulse the derivative is 0.
Description: S/MIME cryptographic signature
|[Prev in Thread]||Current Thread||[Next in Thread]|