I'm very interested to learn the answer to this. I'm trying to do the same thing right now.
Rich > On Feb 7, 2015, at 10:16 AM, Daniel Franch <dfran...@gmail.com> wrote: > > Hello, > > I have been searching for a simple frame detection scheme for GNURadio > for a while, but everything I've found either doesn't work or it is more > complicated than I expected. > > What I needed was a block that would be searching for a predetermined > sequence used by the transmitter. While it doesn't find this sequence, > it should give no output. Once it is found, it should output everything > that came after the sequence and discard the rest as "garbage". > > I tried using the simple framer and simple correlator. I created a > simple example that just took a random source, created a frame, > converted it to float, added some delay and then the correlator would > try to find the sequence. But this didn't work. I got a constant zero > signal as output. The documentation on these blocks is really poor and I > couldn't find any good example to clarify its usage. > > On the other hand, I found plenty of examples of the header/payload > demux. But it seems more complicated than what I need. I don't quite > understand the tags and streams portion of GNURadio and I am not sure on > what I should use as header data. > > I have been trying to create a block that will try to check for a known > sequence in the incoming stream. Once it is detected, it will read the next L > samples (L will be the message length defined by the user) and create a > frame, which will be sent as a message. Everything before the detection of > the known sequence will be ignored. The message will then be read by further > blocks as the received frame. Unfortunately, creating a message passing block > from scratch is turning out to be way harder than I expected. > > Is there any easier way to do this? > > Thanks in advance, > Dan Franch > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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