Re: [Discuss-gnuradio] Observation concerning decimation with CIC

[Christoph Thein]

Hi Matt,

the new image seems to solve the problem. Thank you!

What did you change in the code? 

Cheers,

Christoph & Hanwen



> Gentlemen,
>
> Could you please program your SD card with the attached FPGA image and
> let me know if it solves your problem?
>
> Thanks,
> Matt
>
> Christoph Thein wrote:
> > Hello,
> >
> > we have implemented synchronized reception with two USRP2's using a
> > common clock and the 1PPS signal to be able to use the two ethernet
> > interfaces. This works quite good but we observed one thing.
> >
> > When we set the decimation rate to an odd number (5 in our case), the
> > samples are aligned perfectly. When we use an even numbered decimation
> > rate, we could detect unalignments in some of our test runs with the same
> > setup.
> >
> > We have the idea that this is related to the way the decimation is
> > performed (refer to "Re: [Discuss-gnuradio] USRP2 Filtering/Decimation
> > Question" for more details) i.e. if only the CIC is involved it works
> > fine otherwise there are some troubles.
> >
> > Does anybody have made similar observations or is able to tell more about
> > the problem?
> >
> > Thanks,
> >
> > Hanwen  & Christoph
> >
> >
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio