Thanks Stephan, that was a very good point to make. I have reduce the number of taps in my equalizer.
Unfortunately, this hasn't fixed the issue I spoke of (surprisingly). I am seeing dropped packets at sample rates of 200k, on and off, and HUGE latency between making a change at the transmitter and seeing it at the receiver. I am beginning to suspect an underlying network issue. My setup is an old cheap gigabit switch which connects two N210's to my laptop. I think something in that domain isn't performing as it should. I will dig further. v/r, Rich On Thu, Feb 19, 2015 at 12:01 AM, Ludwig Stephan (CR/AEH4) < stephan.ludw...@de.bosch.com> wrote: > Hello Rich, > > > > although Ed commented on the latency issue, regarding your performance > issue my 2 pence: From my experience, using a time domain equalizer with > 100 taps is a huge computational burden. Imagine: You are expecting > significant echos (to be equalized) of 100*4/250kHz=1,6 ms. I do not know > your application, but for wireless this is a whole lot. > > > > BTW: I am about to use exactly your computer USRP setup. > > > > Best regards > > > *Stephan Ludwig * > Robert Bosch GmbH > Corporate Sector Research & Advance Engineering, Communication Technology > (CR/AEH4) > Renningen > 70465 Stuttgart > GERMANY > www.bosch.com > > Tel. +49(711)811-8809 > Fax +49(711)811-1052 > Mobile +49(172)5630639 > stephan.ludw...@de.bosch.com > > Registered Office: Stuttgart, Registration Court: Amtsgericht Stuttgart, > HRB 14000; > Chairman of the Supervisory Board: Franz Fehrenbach; Managing Directors: > Dr. Volkmar Denner, > Dr. Stefan Asenkerschbaumer, Dr. Rolf Bulander, Dr. Stefan Hartung, Dr. > Dirk Hoheisel, Christoph Kübel, > Uwe Raschke, Wolf-Henning Scheider, Dr. Werner Struth, Peter Tyroller > > *Von:* discuss-gnuradio-bounces+stephan.ludwig2=de.bosch....@gnu.org > [mailto:discuss-gnuradio-bounces+stephan.ludwig2=de.bosch....@gnu.org] *Im > Auftrag von *Richard Bell > *Gesendet:* Donnerstag, 19. Februar 2015 00:45 > *An:* discuss-gnuradio@gnu.org > *Betreff:* [Discuss-gnuradio] QPSK Receiver and Processing Power > > > > Hello all, > > My question is, looking at my receiver flowgraph, would you think this > design should push the limits of a good laptop? Would you believe I could > be constrained to near the lowest sample rate limit with this design? > > Laptop Specs: HP Elitebook 8570w, Core i7, 16 GB RAM, Ubuntu 14.04 > > > > I would be interested in hearing what sample rates other peoples QPSK > radios run at with a USRP N210 and similar computer. > > Thanks, > Rich >
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
