Category: analog and digital communication systems
analog and digital communication systems question and answers solved
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Problem 7 Consider a single sideband amplitude modulation suppressed carrier (SSB-SC). Let the message spectrum be that shown in Problem 6 and let a. Sketch a block diagram of the SSB-SC transmitter system showing a mixer, filter, and antenna. Label the signals at the different stages of your transmitter. b. Sketch the frequency response �(�) of the minimum bandwidth filter needed by your transmitter to generate proper SSB-SC. Note you may use an upper side band or lower sideband filter (your choice). c. Sketch the spectrum of the signal at the antenna of your system. Label the spectrum in a manner consistent with your notation in a.
Problem 5 Consider a message signal ,,,,,,,,,,,,,,,,,,,a. Sketch �(�) b. Use MATLAB to validate your sketch from a. c. Sketch �(�) d. Sketch the power spectral density (PSD), ��(�), and specify units. Recall that if a frequency spectrum is made of Dirac deltas, the corresponding PSD is found by squaring the areas of the deltas (same basic plot). e. What is the modulation index? f. What is the efficiency � (ratio of side band power to total power).