# Upsampling and pulse duration

• How does upsampling factor relate to pulse duration?

• If I want to do pulse shaping and I have rcosdesign(beta,span=8,sps=4) should I upsample by 8, 4 or 33(8*4+1) and why?

• I've seen you'd normally upsample by 4 and I can't see why.

• Like, that way you're not using the whole pulse to shape a symbol, shouldn't it be 33?

I'd appreciate very much someone explained this to me. Thanks!