Run two USRP simultaneously

Hi, All,

I want to run benchmark_tx.py and benchmark_rx.py simultaneously. So I
write a shell script to do that.
#-----------------------run.sh-------------------------------
sudo ./benchmark_tx.py -f 24e8 -w 0 &
sudo ./benchmark_rx.py -f 24e8 -w 1 &

From the output result, sometimes, the first output message from the
receiver is:
.ok = True pktno = 0
it means the first packet that receiver could get, is the first
transmitted packet.
But sometimes, the first output message from the receiver is:
.ok = True pktno = 2
it means the first packet that receiver could get, is only the second
transmitted packet.
Then I run “sudo ./run.sh” again,
.ok = True pktno = 1

It seems like the first received packet number is random. It may be 0,
or 1, or 2. After receiving the first packet, the following received
packet will all be correct.
So the receiver will miss the first or second transmitted packets if I
run benchmark_tx.py and benchmark_rx.py simultaneously.

Has anyone seen the same case before? Why will the receiver lose the
first one or two packets?


Best Regards~
Fengyuan Gong

On Tue, Apr 19, 2011 at 10:04 PM, Fengyuan Gong
[email protected]wrote:

.ok = True pktno = 0
or 1, or 2. After receiving the first packet, the following received

There is a lock-in time associated with all of the synchronization
loops,
which will change depending on the noise in the system. So it might not
synchronize until after the first packet or so. So yes, it’s random
because
you’re dealing with stochastic processes :slight_smile:

I’m a bit surprised that you are sometimes missing the first 2 packets.
Could be due to bad multipath (the benchmark scripts don’t use an
equalizer)
or any of the other random things that happen.

Tom

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