>>> Hi, >>> >>> I am having trouble the the DBPSK mod and demod blocks. My flow graph is: >>> file source -> DBPSKmod -> DBPSKdemod -> file sink >>> >>> If anyone knows why the output file of the whole graph would be 13 bytes >>> or if I am missing something please let me know. >>> >>> Thanks, >>> Dave On Wed, Apr 21, 2010 at 9:46 PM, marcin_w <mwie9...@uni.sydney.edu.au> wrote: > > My mistake, i didn't realise you were using the available DBPSK block. The > Packed to Unpacked block is already part of this Modulator, so disregard my > comment.
Does the bpsk block you're using have some form of timing correction in it? More than likely the data is being run through some sort of filter (either explicitly or effectively) and the zeros at the beginning are a warm up from the padding. If you'd like the output to be 'nice' from a mathematical point of view you will have to deconstruct the mod/demod blocks a little bit and remove the timing correction stages and make sure that your simulated channel does not introduce any timing corrections. Jason _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
