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6.2-4 For baseband modulation, each bit duration is Th. If the pulse shape is

P2(t) = π(t/Tb)

(a) Find PSDs for the polar, on-off, and bipolar signaling.

(b) Sketch these PSDs and find their bandwidths. For each case, compare the bandwidth to the PSD obtained in Prob. 6.2-3.