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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