In the system in Figure E-15

and let the lowpass filter (LPF) be ideal with a frequency response magnitude of one in its passband.



(a) Find the signal power of yt(t).

(b) Find the signal power of yd(t).

(c) Find the signal power of yf(t) if the cutoff frequency of the lowpass filter is 1 kHz.

(d) Find the signal power of yf(t) if the cutoff frequency of the lowpass filter is 100 Hz.




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