Hello!
I am trying to use 2 N210's connected by a MIMO cable to execute the uhd example program txrx_loopback_to_file. I have one host machine and would like one SDR to transmit the signal and the other SDR to receive it to a file. I would like to eventually modify the code so that I can make a bit error rate tester between the two N210's, but I was trying to get the threading to work first. I have the args: --tx-args="addr=192.168.10.2" --rx-args="addr=192.168.10.3" --type="float" --nsamps=1e6 --tx-rate=5e6 --rx-rate=5e6 --tx-freq=900e6 --rx-freq=900e6 --tx-ant="TX/RX" --rx-ant="TX/RX" --ref="mimo" --wave-type="SINE" --wave-freq="2000" I am using matlab to convert the binary file "usrp_samples.dat" into a complex array and I plot the results. I have attached the plot. The results I get from the receive function do not resemble a sine wave; it looks more like noise. I have 50 db (50 ohm) attenuation inline with the cable that is connecting the two usrps (I am not actually transmitting over the air). However when I run the code, I see that LED's indicating that they are transmitting and receiving as they should, but the results are not what is expected. I am fairly new to usrp and C++, so any help or direction as to what could be the problem would be greatly appreciated. Thank you for your time! -Sarah Leony Electrical Engineer
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