Using the message signal, for the modulated wave under each modulation scheme shown below, find the time-domain expression and its Fourier transform. Furthermore, using MATLAB, plot the time-domain signal of each modulated signal by a carrier with a frequency of 50 Hz for a duration of 10 seconds.
(a) Amplitude modulation with 50% modulation.
(b) Double sideband-suppressed carrier modulation.
(c) Single-sideband modulation with only the upper carrier transmitted.