The message signal m(t) is defined as
This message DSB-AM modulates the carrier and the resulting modulated signal is denoted by ( t) . It is assumed that to = 0 .15 s and ƒc = 250Hz
1. Obtain the expression for ( t) .
2. Derive the spectra of m ( t) and ( t) .
3. Assuming that the message signal is periodic with period To = to, determine the power in the modulated signal.
4. If a noise is added to the modulated signal in part 3 such that the resulting SNR is 10 dB, find the noise power