2011/12/9 John Malsbury
<address@hidden>
Domenic,
Whenever you are transferring data from a transmitter to a
receiver it is reasonable to use some sort of framing. If
you want a quick test, use a packet encoder and decoder on
your transmitter and receiver, respectively. This will
packetize the data and eliminate the continuous flow of
"garbage" data to your file since the decoder will only
output data from valid packets(w/ header + crc are
removed). Bit errors will manifest themselves as a "short
file", since bad packets will be discarded. If you run the
block in verbose mode there may also be reporting for when
packets are discarded.
Set the payload length number in the encoder so you have a
known relationship between the number of bytes missing from
the file and the number of packet errors.
There are numerous ways to improve this simple test, but
this is a start for you. Also, you may want to perform a
more fundamental bit error test. See error rate block.
Just a word of warning:
If you use the package en/decoder and the BER block , it
might just go haywire
The BER block cannot regain from a missing frame (which
would be the case if the framer threw it away)
-J
On 12/09/2011 07:29 AM, Domenic Magazu III wrote:
All,
I was playing around with the DPSK block
provided with GNU Radio. I was able to get my
two USRPs talking to each other. I placed a
file sink on the random source generator (set
to transmit 10 random binary digits) and I'm
able to see what was actually sent from that
file (command: od -d filename.bin). I was
curious how I go about verifying that the
message in my filename.bin is received as
transmitted on the other end? I tried placing
a file sink on the DPSK demod block however
because the receiver is constantly pulling in
information my file becomes extremely large
and it's difficult to determine where the
message would be amongst the other 'noise'.
Does anyone have any ideas on how to verify my
transmitted message is making it to my
receiver?
Thank you
Domenic
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