# Bandwidth of a modulated signal in analog domain

If i am using QPSK modulation with data rate 4 Mbps with rolloff factor $$0.5$$, then the bandwidth will be symbol $$\rm rate\times (1 + rolloff\ factor)$$. So here it will be $$\rm 2\ MHz\times 1.5 = 3\ MHz$$

This is baseband data bandwidth.

So should I use analog filter of bandwidth $$\rm 3\ MHz$$ or should it be more? or should it be more than that?