Hi Martin, Thanks for your answer, actionnally I don't have a code yet because I am trying to run simulation from the flowgraph directly. The problem is in the polyphase clock sync, in this block i should define several parameters even the filter taps. Normally, I should add coefficients values or provide a function able to calculate them. in the tutorial http://www.trondeau.com/storage/grcon12/rondeau-mpsk_tutorial.pdf , Tom used this command *firdes.root_raised...* which i think that's firdes.root_raised_cosine and maybe I missed something, therefore it still red so the block cannot be functional. The question is how can i obtain the filter taps on my polyphase clock sync by using firdes.root_raised_cosine? Any proposition is appreciate Zakaria
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