John, Thanks for replying. The question is, how do I do this? We both agree the zeros need to go. What I'm not sure on is how to do that. I'd rather keep this contained to GRC, because I don't like maintaining python files not connected to grc. Can you explain how you do this or provide an example?
v/r, Rich On Tue, Apr 28, 2015 at 1:41 PM, Johnathan Corgan <johnat...@corganlabs.com> wrote: > On Tue, Apr 28, 2015 at 12:48 PM, Richard Bell <richard.be...@gmail.com> > wrote: > > >> When you mentioned I should remove leading or trailing zeros from the >> Correlation Estimator symbols field, how would you go about doing this if >> you used the modulate vector block as done in the example? I'm stuck on >> this. >> > > The group delay in the pulse shaping filter (in this case, RRC) causes > these leading zeros. This is something I'd like to figure out a "proper" > solution for, but my quick hack that works pretty well is to duplicate the > PN sequence as it goes into modulate_vector, then take only the second half > of the samples of the output for the correlation block. > > This then "pre-fills" the filter with data that is arguably the right > spectral shape, and the resulting second-half vector works much better than > the original way. > > Again, this is a quick hack, but it works well. > > -- > Johnathan Corgan > Corgan Labs - SDR Training and Development Services > http://corganlabs.com >
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