On Sun, Nov 21, 2010 at 12:19 PM, Ben Reynwar <[email protected]> wrote: > I just found simple_framer and simple_correlator which were what I was > missing. > > Cheers, > Ben > > On Fri, Nov 19, 2010 at 10:47 PM, Ben Reynwar <[email protected]> wrote: >> Hi all, >> >> I'm playing with gnuradio and am trying to create a simple example >> where I take some data, do a virtual transmission, and then check I >> have the same data at the receiving end. >> >> I've got it successfully working with the following string of blocks: >> vector_source_b, dbpsk_mod, channel_model, dpsk_demod, vector_sink_b >> >> It works but I have to do some messing round in python beforehand and >> afterwards adding on access codes and headers and putting some buffers >> before and after the packet. I expect that blocks already exist to do >> most of this stuff but I haven't managed to find them. >> >> I don't have any background in this kind of stuff so I might be going >> about this in completely the wrong way. I also don't have a good idea >> of what exactly gnuradio's scope is and what I should expect it to be >> able to do. >> >> The following is the list of the steps I would like my simple example >> to do, and what I have or have not been able to find in gnuradio. >> >> 1) Start of with some raw data. >> There are lots of source blocks to choose from, no problem here. >> >> 2) Parcel it into packets. >> gr_message_sink? (puts it into a message queue, all in one message) >> >> 3) Add access codes and headers to packets. >> I couldn't find anything to do this. Seems surprising. >> >> 4) Combine packets into a stream to be transmitted. >> Can't find anything. >> >> 5) Modulation. >> Plenty of options. >> >> 6) Transmit stream. >> gr_channel_model (because I don't have anything real) >> >> 7) Demodulation. >> Plenty of options. >> >> 8) Receive stream, split out packets and remove access codes and headers. >> gr_correlate_access_code_bb/gr_framer_sink_1 (to queue) >> OR >> gr_packet_sink (to queue) >> >> 9) Combine packets to get original raw data. >> Can't find anything. >> >> If anyone could tell me of any blocks I've overlooked, or how I should be >> going >> about it differently I'd appreciate it. >> >> Cheers, >> Ben
Ben, The other place to look is gnuradio-examples/python/digital. The main program you will probably want to look at is benchmark_loopback.py. If you have qtgui installed, I recommend, benchmark_qt_loopback2.py, instead. This will show you how to handle the input/output issues. It's a bit tricky to find your way through the code, I admit, but if you can follow it, it should answer most of your questions. (we will hopefully be able to clean this up at some point.) Tom _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
