Hello Roohollah Parvizi: -There could be many reasons, but first, you want to check the link speed that you are getting from the switch (requires 1000Mbps connection - 100Mbps won't work).
-rx_samples_to_file is part of UHD (not GNURadio application, although somewhat related). I believe it is not capable of MIMO synchronization without modifications (please correct me if I am wrong). You can download its source code from the UHD Github project and adapt it if you want. -It is probably easier to use GNURadio. I am actually not sure if you have GNURadio on your system, since that rx_samples_to_file is bundled with UHD, not with GNURadio. Anyway, if you have it installed on your PC, you should be able to use GNURadio Companion to write a short program out of it. On GNURadio Compaion, you should add a "UHD: USRP Source" block and set "Num Mboards" = 2 and match settings with your configurations (Will have to set device address, Mb0/1 Clock/Time source, etc). Regards, Kyeong Su Shin On Tue, Feb 14, 2017 at 3:01 PM, Roohollah Parvizi <rparv...@hawk.iit.edu> wrote: > Hello all, > > > I am using the two USRP N210 with the SBX daughter board for the MIMO > system. first, I changed the IP address of the second USRP to > “ip-addrs=192.168.10.3” and the name of both USRP’s as well. > > I have these issues for setting the MIMO system, > > · I connected both USRP’s via the Netgear switch to the host > computer. Unfortunately, I did not get any respond from the USRPs (none of > them). I checked “uhd_find_devices” and the output was “ no USRP devices > found “ Even I tried the single USRP using the switch I had the same issue. > > · After I was unsuccessful using the switch, I tested the MIMO > cable without the switch (I mean I connected device 1 to the device 0 via > the MIMO cable and then connected device 0 to the host computer), it > worked. So, I started collecting the sample data using the > “rx_samples_to_file_.exe” command. For getting sample data from both USRPs > simultaneously I used the “ rx_samples_to_file --args=”addr=192.168.10.2” > --freq 1575.42e6 --gain 30 --rate 10e6 --duration 30 > usrp_dir_G30_samples.dat addr=192.168.10.3 --freq 1575.42e6 --gain 30 > --rate 10e6 --duration 30 usrp_reflect_G30__samples.dat “ ( the brief > version of command ). However, it failed. Therefore, I executed those > commands individually. Since I wanted to acquire signals simultaneously, I > executed those commands separately at the different windows command prompt. > My question is that is there any way to execute those commands as a block? > Or is there a single command to force both USRP to start getting data? > > Could you please help me with those issues? > > > > Thanks in advance, > > RP > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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