answer question number 4 and 5 and show answer step by step ENS432 Final Exam 5/
ID: 2293240 • Letter: A
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answer question number 4 and 5 and show answer step by step
ENS432 Final Exam 5/22/18 True D or Falsc) (20 points total) correlation function of a power signal is the inverse Fourier transform of the power spectral PLEASE WA FASE WRITE YOUR ANSWERS TO ALL QUESTIONS IN T IN THE BLUE BOOK (not on this page) Identify each statement below as either True or False(F) (20. 1. A periodic signal can never be an energy signal. 2. A trigonometric Fourier series cannot be us umetric Fourier series cannot be used to express a complex-valued sina density of that signal. 4. An envelope detector cannot be successfully used to d detector cannot be successfumy to demodulate AM signals with modulation index> 5. Using SSB techniques, it is possible to send separaten same carrier. le messages in the upper and lower sidebands of the 6. In the superheterodyne receiver, the center frequency of the le channels. the IF filters is adjusted to select different radio 7A Costas lan can recover carrier frequency and phase but is subiect to a sien ambiguity error (phase shift of it). 8. Delta modulation is a form of PAM in which the pulse shapes are triangular 9 Alias distortion results from a non-flat passband shape in the reconstruction Cilter 10. Pulses can exist that are both band-limited and ISI-free. Long-answer problems. Complete any of the 6 problems below for a total of up to 80 points. When giving a numerical answer, specify units if any apply. 11. (a) Find the correlation coefficient between the reference pulse g.(t) and each of the other pulses g (b) If g(/) and one of the other pulses are to be used in a binary communication system, which pulse should be chosen to obtain the best noise immunity? Explain your choice . 8.0 8.0Explanation / Answer
4). True
Explanation: For over modulated (modulation index > 1) signal, the envelop detector fails to follow the orignal message siganl at the zero crossing, as a result the output will be distorted message
5). False, because the content in the two sidebands is of the same single message signal
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