[40p)-1. Single side band (SSB) modulation is applied to a message MO signal m(t) to generate single side band modulated signal Ssse(t) for the lower side band. The carrier is c(t) = cos(2000007 t) and amplitude spectrum of the message signal M(f) is depicted in Fig.1. -1 0 1 Fig. 1 (a) Find the single side band modulated signal Sssb(t). (b) Find and draw frequency spectrum of the single side band modulated signal Ssse(f) (c) Design and sketch block diagram of a coherent demodulator to obtain the m(t). (d) Show that with the demodulator designed in 1(c), m(t) can be fully obtained.