Frequency analysis of amplitude-modulated discrete-time signal The discrete-time signal
where modulates the amplitude of the carrier
where The resulting amplitude-modulated signal is
(a) Sketch the signals
(b) Compute and sketch the 128-point DFT of the signal
(c) Compute and sketch the 128-point DFT of the signal
(d) Compute and sketch the 256-point DFT of the signal
(e) Explain the results obtained in parts (b) through (d), by deriving the spectrum of the amplitude-modulated signal and comparing it with the experimental results.
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