Good evening, I attach three captures to show you the problem, one with the reference signal i transmit, one with the received samples when using the same device for TX and RX and one with the received samples of the one device, when the second one transmits. I also attach the flowgraph i used for this capture. The sampling rate i use is 1MHz. The specific captures are done with the USRPs over USB-2 ports, but i have also tried over USB-3 and observed the same behavior.
Thank you for your time same_tx_rx_device.dat <https://drive.google.com/file/d/0BxyASy57xNmqV2pLd2xUVWRRRU0/view?usp=drive_web> refference.dat <https://drive.google.com/file/d/0BxyASy57xNmqT1JQd2xfWjF6SjQ/view?usp=drive_web> different_tx_rx_device.dat <https://drive.google.com/file/d/0BxyASy57xNmqMVhqd29NTmdiMDA/view?usp=drive_web> On Tue, Jun 13, 2017 at 12:04 AM, Marcus D. Leech <mle...@ripnet.com> wrote: > On 06/12/2017 03:53 PM, George Vardakis wrote: > > Hello all, > > I have two USRP B210 devices which i use in my MIMO application. When i > use the two of them concurrently in a flowgraph - or different flowgraphs - > i notice that the signal received by the streams of one of the devices (the > one whose serial number is last in lexicographical order) is distorted. > Because i transmit a known training sequence, i know what to expect, and i > observe that sometimes the real or imaginary part of the signal has flipped > its sign (i see the signal mirrored compared to the known one), or other > times it is completely distorted. When i use each device separately, > everything works fine. The UHD driver i use is the v3.9.5 one.Any ideas > about it? > > Thank you! > > > _______________________________________________ > Discuss-gnuradio mailing > listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > COuld you perhaps share a very-simple flow-graph that shows the issue? > > What sample-rate are you using? Is this over USB-2 or USB-3? > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
test.grc
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