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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