On Wed, Dec 1, 2010 at 5:02 PM, Nick Foster <n...@ettus.com> wrote: > On Wed, 2010-12-01 at 13:53 -0800, Vladutzzz wrote: >> The problem is that I am in the middle of a project, time is of the essence >> and I don't have time to start stumbling around with UHD, right now I have >> to use Simulink, hence UDP. GnuRadio Companion still doesn't work with UHD, >> right (I am very new to python)? > > GRC has always worked with UHD. You might try downloading the latest UHD > and giving it a shot. > >> So no chance of UDP working with 2 USRPs at once, huh?! > > No. > >> Let me ask you something else then, if I manage to synchronize 2 USRPs >> working on separate computers to start sensing a band of 16MHz each, and >> their central frequency being 16MHz apart, saving those two bands in a file >> , what block (system of blocks) can I use to compose a 32MHz band (and I >> mean the whole band not just their power measurements) from the two 16MHz >> halfbands originating from the "From File" blocks? >> Naturally the samplerate of the new signal should be the double of that of >> the halfbands. >> If I just use a 2:1 multiplex the halfbands appear superimposed and the >> resulting signal band still occupies 16MHz. > > Assuming your signals are mixed to baseband you can interpolate both to > 32Msps and mix one sideband up and the other down so they sit where they > are supposed to, and then add the signals together. There's probably a > smarter (faster) way to do it. > > --n
There's the pfb_synthesis_filterbank that could do this, too, but it's probably not faster than your way if you are just doing two "channels." This code also needs a bit of a SIMD burst for the internal filters, and there's another tweak that I will be making so that you can more easily upsample and smash the channels together for perfect reconstruction (that is, if you're using a real Nyquist filter). But yeah, for right now, I'd do it the way Nick suggested. Tom >> Any ideas? >> Your help is really appreciated, >> >> Vlad. >> >> >> >> Marcus D. Leech wrote: >> > >> > On 12/01/2010 05:49 AM, Vladutzzz wrote: >> >> Thank you Marcus, for the very prompt and exhaustive reply! >> >> Mostly it's what I expected, but I am a wee bit worried about the IP >> >> addressing process: >> >> I need to change the IP of one of the USRP2 modules, how do I do that, >> >> considering I use an UDP FPGA image and not UHD? >> >> Also, what IPs should I use in the USPR2 source blocks, now that there's >> >> 2 >> >> of them? >> >> Thanks! >> >> >> >> Vlad. >> >> >> > My advice would be to screw up your courage, bite the bullet, and >> > convert to UHD. >> > >> > Theres a UHD utility, usrp2_addr_burner that can be used to change the >> > IP address. >> > >> > The factory address is: 192.168.10.2, you'll need to change it to an >> > address on a different >> > subnet, like 192.168.20.2 or some such. The idea is that you have >> > two GiGE ethernet ports, >> > and you configure your system with the appropriate subnet on each >> > ethernet port, and program your >> > USRP2 addresses accordingly. >> > >> > >> > >> > -- >> > Principal Investigator >> > Shirleys Bay Radio Astronomy Consortium >> > http://www.sbrac.org >> > >> > >> > >> > _______________________________________________ >> > 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
