I am working with GNU Radio Companion 3.6 on CentOS. I want to calculate
BER, so I have been using the “Error rate” block.
First, I send a random QPSK-modulated signal through a simulated noisy
channel (AWGN). I calculate the BER using the function error:
BER=0.5*erfc(sqrt(snr)) and compare it to the output of the “Error rate”
block. I find almost same results.
Second, I send a random QPSK-modulated signal through one USRP and
it with another USRP. Here is the problem: contrary to expections, the
output of “Error rate” block is always 0.5, and it does not vary with
variation of SNR.
You find attached the flowgraph of this second scenario.
I am wondering if this block should not be used with USRPs to calculate
BER. If not, any suggestions?
Any help is appreciated. Thank you.
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