You'll need to figure out how to flush the filter state and send actual 0+0j samples through. Maybe you can set a flag and multiply the samples coming out by 1 or 0 depending if you are flushing or not?
Brian On Wed, Dec 5, 2012 at 12:11 AM, George Sklivanitis < george.sklivani...@gmail.com> wrote: > The filter is consisted of 55 taps. > I tried by sending zeros. Though zeros are interpreted in -1's from the > modulation mapping block. > Moreover, the zeros will be taken into account as symbols to be shaped, > therefore, the same thing will happen. > > -George > > > On 12/5/12 12:07 AM, Brian Padalino wrote: > > Have you taken into account the group delay of the filter? How long is > your filter? Try sending zeroes at the end to flush your filter state? > > Brian > > > On Tue, Dec 4, 2012 at 11:35 PM, George Sklivanitis < > george.sklivani...@gmail.com> wrote: > >> Hello all, >> >> I have a question applying to everybody that have tried transmitting >> symbols in different kinds of modulation (BPSK, QPSK, GMSK etc). >> I am using the following configuration in GNU Radio ( random source block >> -> bytes to symbols -> SRRC block -> file sink) >> >> The attached figure plots the generated symbols (+1,-1) with red color >> along with the upsampled SRRC waveform (blue) >> For some reason that I am not able to understand the last 8-bits do not >> have a correspondence with the waveform created. In other words >> the waveform is "cut" at the last byte. >> Can anyone help me with the above. >> >> Thanks, >> -George >> >> -- >> Sklivanitis Georgios >> PhD Student >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > > -- > Sklivanitis Georgios > Ph.D Student > Communications Division, > Department of Electronics and Electrical Engineering > University at Buffalo, The State University of New York > North Campus, Office 205, Furnas Hall > Buffalo, NY 14260www.acsu.buffalo.edu/~gsklivan > >
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