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Problem 8 Consider a superheterodyne receiver for standard AM radio. a. Sketch a block diagram of the superheterodyne receiver showing the major blocks. b. If you wish to receive a radio station at 1600 ���, what local oscillator frequency is needed? (Let ��� = 455 ���) c. What is the “image station” we need to watch out for using this local oscillator frequency? d. Sketch example spectra to illustrate how the local oscillator effectively shifts a transmitted signal spectrum centered at 1600 ��� to on that is centered at 455 ���.
See lessProblem 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.
See lessProblem 6 Consider a carrier, , that is periodic with period 0 = 100 and Fourier series coefficients of
See lessProblem 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).
See lessProblem 4 Consider a message signal m(t) with the spectrum shown as follows. The message bandwidth W = 1 Khz This signal is applied to a product modulator, together with a carrier wave
See lessProblem 3 Using the message signal ,,,,,,,,,1. determine and sketch the modulated wave for amplitude modulation (DSB-LC) whose percentage modulation equals a. 50 percent b. 100 percent c. 125 percent
See lessProblem 2 Consider the message signal m(t) = 20 cos(2) volts, and carrier c(t) = 50 cos(100��) volts. a. Sketch the resulting AM wave for 75 percent modulation (DSB-LC). b. Find the power developed across a load of 100 ohm due to this AM wave.
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