Hint think about the amplitude spectra of the signals

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Unformatted text preview: (fc + fm )t] where 0 ≤ β ≤ 1. [Hint: think about the amplitude spectra of the signals] (a) [5] When β = 0, determine the type of the resulting AM modulation. (b) [5] When β = 1, determine the type of the resulting AM modulation. (c) [5] When β = 0.5, determine the type of the resulting AM modulation. (d) [5] When β = 0.1, determine the type of the resulting AM modulation. 1 3. A lower sideband SSB signal and a uppper side band SSB signal are created by modulating a carrier signal c(t) = cos(2000πt) using a message signal m(t) = cos(200πt) + 2 cos(400πt) (a) [6] Determine the Hilbert transform of m(t). (b) [8] Determine the time domain expressions of the lower and upper sideband SSB signals. (c) [8] Sketch the amplitude spectra of the lower and upper sideband SSB signals. (d) [6] To demodulate the upper sideband SSB signal, we multiply it by 2 cos(2000πt) and then apply an ideal lowpass filter with unit gain. Determine the minimal and maximal bandwidths of the ideal lowpass filter such...
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This document was uploaded on 02/28/2014 for the course ECE 318 at University of Waterloo, Waterloo.

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