I'm a bit confused. What exactly are you trying to do? On Thu, Jun 23, 2011 at 9:17 AM, Songsong Gee <gee.songs...@gmail.com>wrote:
> Continueing with http://www.ruby-forum.com/topic/1983866, > > I have planned to append a preamble before an actual signal and turn RX on > earlier than TX. > > Then RX will receive a signal like below: > > |---RX turn on------|---TX turn on----------------------------- > (---trash signal---)(---preamble---)(---actual signal---) > > And this signal is demodulated and stored into a sink file. > After that, I run a program that extracts an actual data only and compare > it to the original. > > My concern is that this preamble should be assumed to be perfect i.e. no > errors > Of course, there isn't no error. However if I set an amplitude to maximum > value, it can be said to be no error. > I have a pre-defined preamble sequence with length n (n = around 100-200, > can be changed) > > Thus, I am trying to change amplitude of modulated signal for preamble and > actual signal > But I have problem with some quadrature modulation. Flow graphs are in > below: > > http://dl.dropbox.com/u/11382666/for_gnuradio_mailinglist/M-DPSK.png > http://dl.dropbox.com/u/11382666/for_gnuradio_mailinglist/M-FSK.png > > My question is that, how many samples after DPSK mod or frequency mod block > corresponds to each sample from file source? > I have to solve this problem in order to figure out how many samples are > generated from preamble with length n. > If I know that information, I can set a duration for Multiply const block > having large value for preamble and normal value for actual signal > > And second question is that, although I know that information, I don't know > how I can control value. > For example, preamble with length 200, then I want to set large value for > duration 200 * x (number of samples generated after DPSK, Frequency mod), > and after that I want to set normal value for remaining duration. > > Is it too complex for gnuradio-companion flow graph to make? And is python > hard coding possible? > > -- > Seokseong Jeon (aka Songsong Gee) > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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