Wednesday, April 5, 2017

filters - Why do we do oversampling in raised cosine?


I would like to do know why do we need to do oversampling in a raise cosine filter. There is already a question like this but the answer is very confusing and not sufficient.



  • I need to know what this oversampling factor does?

  • The higher is better or the lower?





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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...