On Mon, May 30, 2011 at 5:05 AM, vanITA1082 <vanessa.gardel...@iit.cnr.it>wrote:
> > Dear Tom, > > Do you mind sharing your code for usrp n210 ? > > I am new on gnuradio and usrp and I am not able to find a python example to > perform packet transmission. > > > Thank you > > Vanessa > You can find lots of examples from my gr_apps github repo: github.com/trondeau/gr_apps For direct cloning: git://github.com/trondeau/gr_apps.git Note, some of these are just basic utilities while others are more "works-in-progress" type projects. Tom > Tom Rondeau wrote: > > > > On Mon, Jan 17, 2011 at 2:48 PM, Josh Blum <j...@ettus.com> wrote: > >> > >> > >> On 01/17/2011 11:31 AM, Veljko Pejovic wrote: > >>> Hi, > >>> > >>> I updated the OFDM example. You can find it at > >>> http://www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz > >>> > >>> It supports both USRPs and the UHD driver. I get pretty bad > >>> performance with UHD receiver for some reason. Any ideas? > >>> > >> > >> For the UHD performance issue, which model usrp? The following applies > >> to usrp2: > >> > >> Was the bad performance on a transmit + receive application? There was > >> an issue where if receive was not keeping up, the transmit flow control > >> could be hampered; this is fixed on next branch. > >> > >> Or was it receive only? And in any case did UHD print and warnings about > >> buffer sizes? Because it needs sysctl permission to allocate a large > >> enough receive buffer. > >> > >> -josh > > > > > > I found issues with the UHD code in setting the sample rates. When you > > set the sample rate, the best thing to do is ask the UHD device what > > the real sample rate it was actually set to. I then use a PFB arb > > resampler to adjust to the actual sample rate that I want. > > > > I was playing around with some FM signals and found that I couldn't > > get anything clean out until I did this, even though I was setting > > what I thought was a standard sample rate (that is, an integer > > decimation of the clock) to my N210. What I asked for and what I set > > were only off by a little bit, but it makes a huge difference in > > performance for FM signals. > > > > That said, we should be adjusting for this in the OFDM code, but it's > > something to keep in mind. > > > > Tom > > > > > >>> > >>> Cheers, > >>> > >>> > >>> Veljko > >>> > >>> > >>> On Tue, Jan 11, 2011 at 9:26 PM, Guanbo <gbzh...@gmail.com> wrote: > >>>> > >>>> Hi, > >>>> > >>>> I was looking for the source codes through the list. > >>>> And I got one from Veljko from UCSB, who are very nice to share his > >>>> codes, > >>>> "ofdm_example.tar.gz" > >>>> The codes are attached. > >>>> Given the enough gain in TX and RX, you can see the output result at > >>>> RX. > >>>> > >>>> Guanbo > >>>> http://old.nabble.com/file/p30650478/ofdm_example.zipofdm_example.zip > >>>> > >>>> > >>>> mrahaim wrote: > >>>>> > >>>>> > >>>>> Hi all, > >>>>> > >>>>> Does anyone know of any updated OFDM benchmark code that is modified > >>>>> to > >>>>> be run on a USRP2? I have seen previous posts of this, however the > >>>>> link to the updated code is no longer available. > >>>>> > >>>>> Thanks, > >>>>> > >>>>> Michael Rahaim > >>>>> Graduate Research Assistant > >>>>> Smart Lighting Engineering Research Center > >>>>> Boston University > >>>>> mrah...@bu.edu > >>>>> > >>>>> > >>>>> _______________________________________________ > >>>>> Discuss-gnuradio mailing list > >>>>> Discuss-gnuradio@gnu.org > >>>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >>>>> > >>>>> > >>>> > >>>> -- > >>>> View this message in context: > >>>> http://old.nabble.com/OFDM-on-USRP2-tp30638994p30650478.html > >>>> Sent from the GnuRadio mailing list archive at Nabble.com. > >>>> > >>>> > >>>> _______________________________________________ > >>>> Discuss-gnuradio mailing list > >>>> Discuss-gnuradio@gnu.org > >>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >>>> > >>> > >>> _______________________________________________ > >>> Discuss-gnuradio mailing list > >>> Discuss-gnuradio@gnu.org > >>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > >> _______________________________________________ > >> Discuss-gnuradio mailing list > >> Discuss-gnuradio@gnu.org > >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > > -- > View this message in context: > http://old.nabble.com/OFDM-on-USRP2-tp30638994p31715444.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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