On Jul 24, 2015, at 14:47, Anderson, Douglas J. <dander...@its.bldrdoc.gov> wrote:
> Hi all, > > I'm taking a read through Kristian Maier's thesis document on the gr-lte repo > (and by read I mean looking at the pictures because I don't know German). > > Looks like he was piping his Coarse PSS Sync block into a "Decimating FIR > Filter" block, but I can't seem to find that (I don't use GRC or even have it > built, so I'm just googling and looking through gnuradio.filter for the name > I would use via Python). The decimating filter is the “normal” FIR filter. The corresponding Python name is gnuradio.filter.fir_filter_xxx. (Replace xxx with input, output, taps types, of course.) I knew this already, but confirmed it by searching my copy of the GNU Radio sources, which turned up "Decimating FIR Filter" in gnuradio/gr-filter/grc/filter_fir_filter_xxx.xml. > Alternately, I read through Tom's blob post on using fft_filter in place of > FIR filters: > http://www.trondeau.com/blog/2014/2/27/to-use-or-not-to-use-fft-filters.html, > and it seems like there may be some benefit to using it instead of the FIR > for the ~50 taps in Kristians filter. fft_filter is a drop-in replacement for fir_filter, so feel free to try it out and see if it improves performance. The last machine I tested on, it was potentially helpful for anything over 10 taps. -- Kevin Reid <http://switchb.org/kpreid/> _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
