New answers tagged pulse
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Nyquist says that you can send up to twice as many pulses (symbols) per second as the channel bandwidth $B$ with zero ISI, so you need $R_s \leq 2B$. That is all there is to it. The sinc pulse has zero excess bandwidth so the bandwidth of the signal is equal to the symbol rate, $B_s = R_s$.
About sampling, Nyquist says that you need to sample at least twice ...
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You can & should window your signal. Choice of window depends on the specific requirements of your application. Wikipedia has a really good overview on properties and trade-offs: https://en.wikipedia.org/wiki/Window_function
Keep in mind that you already ARE windowing: your finite length window is simply an infinite length signal multiplied with a ...
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