Frequency analysis of amplitude-modulated discrete-time signal The discrete-time sig...

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.