An AM signal has the form u(t) = [20 + 2cos3000πt + 10cos6000πt]cos2πfct where fc = 105 Hz. 1. Sketch the spectrum of u(t). 2. Determine the power in each of the frequency components. 3. Determine the modulation index. 4. Determine the power in the sidebands, the total power, and the ratio of the sidebands power to the total power.
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