I have two USRP N210 devices connected by an attenuator cable. I set up
– BEGIN EXPERIMENT 1
Step 1) Use benchmark_tx on one of the USRPs and send 100 packets. At
receiver, I simply record the incoming samples and save them into a file
called samples1.dat. This file is static and does not change from now
Step 2) Run benchmark_rx with the --from-file=samples1.dat option. The
other parameters (modulation, fft-length, occupied-tones, etc) are
identical to those I used at the transmitter in Step 1. Measure the
Step 3) Repeat Step 2 a bunch of times. Sometimes, I notice differences
the packet delivery ratios, even though all runs of the experiment use
identical ‘samples1.dat’ file and an identical set of parameters These
differences are small (1-2 packet difference), but I don’t understand
Is this normal behavior? If so, could someone please let me know what
probable causes are?
– END EXPERIMENT 1
The next experiment does not use either of the USRP devices.
– BEGIN EXPERIMENT 2
Use benchmark_tx to generate 100 packets, and write the samples into
file (samples2.dat) using the --to-file option.
Use benchmark_rx with the --from-file=samples2.dat option and check
packet delivery rate. The parameters used (fft-length, etc) are
identical to those used to generate the samples in Step 1. I observe
the delivery rate is never even close to 100%.
Change to a different parameter set and repeat steps 1 and 2. Across
different runs, I observe that the delivery rate is anywhere between 30%
This cannot be the expected behavior. Any pointers on what I’m doing
would be much appreciated!
– END EXPERIMENT 2