Synchronization problems with benchmark_ofdm_tx.py and benchmark_ofdm_rx.py?

GNU Radio
1

Hello everybody,

I’m trying to check the GNU RADIO OFDM implementation but I have a
problem.
When I made, for first time, the benchmark_ofdm_tx.py and
benchmark_ofdm_rx.py, everything was ok, but then, many times the RX
seems
not receive nothing or it print “ok:false pktno:65471 n_rcvd:1
n_rigth:0”.

I have powered off the usrps and I’ve restarted pc’s but the problem
persist, so what is the problem? Synchronization problems between RX and
TX?
I don’t have idea.

Cheers, Chris.

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2

Hi Chris,

I have found that increasing the packet size helps, add “-s 32” and for
the
tx amplitude, add “–tx-amplitude=5000” to the command line
for benchmark_ofdm_tx.py.

“ok:false pktno:65471 n_rcvd:1 n_rigth:0” or similar means that it
thinks a
packet was received but it didn’t pass the crc check. the pktno when
‘ok:false’ should be ignored. I get these when nothing is transmitting
so
it’s falsely triggering somewhere.

Mike