Im a total newbie to GNURadio. So my plan was to simply test a digital
modulation path, without channel. Then compare input file and output
file.
The input file was a previously captured random file through GNURadio.
But
the problem is, that the output file is about 8 times bigger and clearly
not
the same!
Any help :)? http://gnuradio.4.n7.nabble.com/file/n38857/grc.png
The output of the demod is unpacked, that is, only one bit in each
byte is used. Place an unpacked_to_packed block before the sink and
you will have more luck, however you will still get an offset in the
byte boundaries between the input and output.
Thanks! I see now what you mean, but how can i get rid of these boundary
mistakes? The Result is similar to the original, but the bytes are kind
of
“shifted”. So from a “FF 00” results a “FE 01”…
Take a look at the packet_encoder and packet_decoder blocks. The
encoder adds a header to the packet, so that the decoder can
synchronise to it, and get the correct byte boundary. The
implementation (in the current master branch) is found at
gnuradio/grc/grc_gnuradio/blks2/packet.py.
This is actually what i would like to do later by hand. Isnt there a
possibity how i can fetch the raw bits or bytes directly after
receiving?
Sorry if its a stupid question…
I don’t understand you’re question. What do you mean by fetch the raw
bits or bytes? It seems that you are already doing that fine with
your file outputs.
This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.
