>>1. Still I have to insert a "Packer Encoder" between my code and the GMSK mod? If yes, with which parameters? The GMSK mod is configured with Samples/Sym=50 , BT=0.4. No. U can make custom packet structure and in that case u need not to use Packet-Encoder.
>>2. Can someone explain me how to use the bitrate parameter? I mean, should I "sync" the output of my block with the modulator? If yes, how? Sync is not required because Signal-Processing blocks in GR don’t understand bitrate/sampling-rate. If u have connected Transmitter-FG with USRP, then u can determine the "effective bitrate" of transmitter by calculating it backwards from USRP-sink sampling-rate. symbol-rate = usrp-sampling-rate / samples-per-symbol bit-rate = symbol-rate * modulated_bits_per_symbol -Adeel On Sun, Jul 21, 2013 at 1:44 AM, embyte <emb...@madlab.it> wrote: > Hello list, I would like to transmit some data using gnu-radio. My data is > a binary representation of an ASCII string. > > I wrote my own block that builds the frame (header, payload, CRC, trailer) > as an array of 256 bytes (0s or 1s): > > gr_make_io_signature(0, 0, 0) > gr_make_io_signature(1, 1, sizeof(char)) > > char *out = (char *) output_items[0]; > > [build the frame] > > memcpy (out, frame, 256); > noutput_items = 256; > > My question are: > > 1. Still I have to insert a "Packer Encoder" between my code and the GMSK > mod? If yes, with which parameters? The GMSK mod is configured with > Samples/Sym=50 , BT=0.4. > > 2. Can someone explain me how to use the bitrate parameter? I mean, should > I "sync" the output of my block with the modulator? If yes, how? > > I tried to redirect the transmitted signal to a file, and use a receiver > (that I know working), but without success. The parameters used in the > receiver's GMSK demod are the same configured in the modulator. > > Thanks! > > ______________________________**_________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/**listinfo/discuss-gnuradio<https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >
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