Hi all,
I've been learning gnu-radio for two-months now.GNURadio mailing-list archives
have been a lot useful to me and now I have a question or two to ask.
When I ran the example benchmark_loopback.py, every parameters with
default-setting, it was fine and I have received 666 packets correctly.
However, when I changed the code so that I'm reading the (pseudo-random) data
from a file (12500 bytes total) and packet-size of 100bytes, I found that I
didn't receive the last packet.
Another thing I changed to the code is that to write the data retreived from
the receive side to a file. I defined an outfile and in rx_callback funcition,
I wrote payload data to the file and looked at the retreived data and confirmed
that I'm shot of the last packet.
I also logged data at various stages for troubleshooting and I found that I'm
getting 16bytes less than what I should after the mpsk_receiver (which I think
leads to the last packet loss at the correlator later?) I was using the
default parameters for the receiver; I tried to study on the workings of it,
and tweaked a few parameters but in vain.
Any pointers will be much appreciated.
(I also checked the queue watcher thread to see how many times rx-callback is
called and it is also one less than it should be.)
Another question I have is on the default_access_code used in the
packet_utils.py. I read somewhere in the mailing list that it has to do with
GSM systems. Can anyone tell me if this access_code is from some IEEE standard
and if so, which one?
Thanks in advance.
NT
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