I think I fixed the one hier block error. Also I set the default int/dec rate to 4 and spb to 25. This should give 1 MBaud/sec after despreading. Maybe this will work with 802.11 chipset? Im not sure if the sinc shaping has the right bandwidth (barker code smoothing) after these changes.
--Colby On Mon, Jun 15, 2009 at 10:48 AM, Douglas Geiger < doug.gei...@bioradiation.net> wrote: > If I get some free time (probably next week), I'll try it out between my > USRP2's. Thanks! > Doug > > On Sun, Jun 14, 2009 at 10:45 PM, Colby Boyer <colby.bo...@gmail.com>wrote: > >> Hey All, >> >> I fixed the code in the pkt.py file so that DSSS with the barker code now >> works. The main issue was the length of the barker interpolation filter was >> way too short (like 8). I changed it so that it is now sample per baud * >> 11. Additionally the barker sequence needs to be time reversed on the >> receive side so that the correct match filter is formed. Otherwise the nice >> autocorrelation properties of barker will go away. >> >> I am only able to test it using the test script with a channel filter and >> gaussian noise and so far it has been a success there with both 1 and 2 Mbps >> modulation rates. Can someone test with USRP2? Also the BER seems to be >> much better as compared to just the RRC filter. Hopefully this will make >> TX/RX much more robust. >> >> The code is uploaded to the CGRAN svn under the branch/usrp2_version in >> the bbn project directory. >> >> Cheers, >> Colby Boyer >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > > -- > Doug Geiger > doug.gei...@bioradiation.net >
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