In a Double Sideband Large Carrier (DSB-LC) modulation scheme, a modulating signal Sm(t) = 3 cos(200t) is used to modulate a carrier signal s(t) = 4 cos(410). The time domain mathematical expression of the modulated signal is s (t) = [4+3 cos(200m)] cos(410 t) . (i) (ii) (iii) Calculate the modulation index. State whether the signal is over-modulated or under-modulated. [2 marks] Plot and label the double-sided amplitude spectrum of the modulated signal Sm(t). Note: The horizontal axis should be in Hz. Calculate the power efficiency of this transmission. [3 marks] [4 marks] Activate Widows