In Figure P8.38(a), a communication system is shown that transmits a band-limited signal...

In Figure P8.38(a), a communication system is shown that transmits a band-limited signal x(t) as periodic bursts of high-frequency energy. Assume that X(jω) = 0 for . Two possible choices, , are considered for the moduli signal is a periodic train of sinusoidal pulses, each of duraticnirf shown in Figure P8.38(b). That is,