On Sun, Jul 01, 2012 at 04:01:48PM -0400, Andrew Davis wrote: > > So my plan is to somehow remove at least one stage of filtering from > the FPGA so I can sample at ~4MSPS and have all out of band signals > aliased into that bandwidth. My questions is can this be done and is > my DSP info correct ( Can this work? ).
I used that trick to sniff all Bluetooth channels with a single USRP2 a few years back. I described the technique in this talk at ShmooCon 2009 (179 MB): http://shmoocon.org/2009/videos/Bluetooth-Ossman.m4v I don't think you'll have to hack a daughterboard like I did, so you'll only need to work on the FPGA. My old FPGA mod is here: http://gr-bluetooth.git.sourceforge.net/git/gitweb.cgi?p=gr-bluetooth/gr-bluetooth;a=blob_plain;f=doc/usrp2_alias.patch;hb=HEAD It is out of date, but you should be able to get the idea. I just had to zero out some filter coefficients. _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
