Thanks for adding to the discussion Paul. I should have made it clear
that testing w/ the packets should have been independent from the
"streaming" BER test.
-John
On 12/9/2011 9:48 AM, Paul M. Bendixen wrote:
2011/12/9 John Malsbury <john.malsb...@ettus.com
<mailto:john.malsb...@ettus.com>>
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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Best
Paul
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