(Solved): Let you are given a periodic rectangular wave with period T=0.2 seconds as the message signal m(t) ...

Let you are given a periodic rectangular wave with period $$T=0.2$$ seconds as the message signal $$m(t)$$ shown below, a) (5 pts) For a suitable carrier frequency $$\left(f_c?\frac{1}{r}\right)$$, roughly sketch the AM signal if the AM index is equal to $$0.25$$. b) (15 pts) Determine the power efficiency of the AM signal if the AM index is equal to $$0.25$$. c) (10 pts) Let the carrier frequency is $$f_c=1\mathrm{kHz}$$ and $$K_f=400?$$, roughly sketch the $$\mathrm{FM}$$ waveform, indicate the important frequencies. d) (10 pts) Let the carrier frequency is $$f_c=1\mathrm{kHz}$$ and $$K_p=?/4$$, roughly sketch the PM waveform, indicate the important frequencies.