An amplitude modulated signal AM(t) = 4[1+ m(t)] cos wet and a single sideband plus carrier signal sSB+c(t) = Ac cos wt + m(t) cos wet + m,(t) sin wt are to be envelope- demodulated. The message signal is the same for each modulated signal and is given by m(t) = 2 cos wmt. (a) Determine nAM, the power efficiency for the AM signal. (b) Determine NSSB, the power efficiency for the SSB signal (i) if Ac 20. 3.44 = 4 and (ii) if