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Question: how did they get the average power of st and...

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(b) Expanding Eq. (1) into its individual frequency components, we may write s(I)-Accos (2nfc1 ) + β4, cos(2n(f, t.fmW)- The average power of s(t) is therefore β4,.cos (2n(fc-fmW) The average power of the unmodulated carrier is

How did they get the average power of s(t)? And why is the average power of the unmodulated carrier 1/2Ac^2?

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