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How to generate an AM signal using sampled signal using Matlab
Time and frequency domain representation of signals are concepts that is essential in understanding the characteristics of amplitude and frequency modulated signals. Many electrical engineering technology communications text books do not convey some of the important characteristics of complex signals [1], [2], [3]. The ability to modify parameters and immediately see their effect on the time and frequency representation of a signal is invaluable in understanding communication signals.
Sampling a Time Signal
Time domain representation of signals in MATLAB is analogous to a discrete time signal. Each increment of time represents a sample of a continuous waveform. The size the of time increments, nT, determines the maximum unambiguous frequency of the sampled signal. The Nyquist rate is the sampling frequency required to unambiguously sample a signal of maximum frequency content fmax [5]. The Nyquist rate is defined below:
fs 2fmax
The time increment is T=1/fs. In these simulations, the carrier is displayed at the center of the plot, therefore the sampling rate will be:
f s 4 f c
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