3. (3 points) An AM modulator outputs the following signal CAM (t) = • [a+b £ ¤ (² Σπ ] t-3n x 10-3 10-3 cos(1000000πt) n=-∞ If the modulation index is 0.3 and the average power of the modulated signal is 2.5 W, find a, b, and the modulation power efficiency.
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