The modulation process of a scheme called vestigial sideband (VSB) modulation is shown in Figure (a) and BPF response is given in Figure (b). Show that the message signal m(t) can be demodulated by the same coherent detector used in DSB-SC. (25 pts)
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The modulation process of a scheme called vestigial sideband (VSB) modulation is shown in Figure (a) and BPF response is given in Figure (b). Show that the message signal can be demodulated by the same coherent detector used in DSB-SC. ( )
![An amplitude modulated wave is given by s(t) = [1 + kam(t)]c(t), where ka is the modulator sensitivity, m(t) is the message wave and c(t) is the carrier wave. Assume that a sinusoidal signal is chosen as the carrier wave; c(t) = cos(2πfct), where fc is the carrier frequency. Let the message signal m(t) be a periodic triangular pulse wave shown in Fig. 1 Figure 1: Message signal m(t) (a). Find ka for 50% modulation. [hint: Percentage modulation is defined as max|kam(t)| × 100% ] (b). Sketch the amplitude modulated signal s(t) for 50% modulation.](https://www.doubtrix.com/uploads/editor/0778063553RLzvMpgLmL.jpeg)
