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Unformatted text preview: ECEN 455: Assignment 8 Problems: 1. (CSE: 8.3) In a binary PAM system, the clock that specifies the sampling of the correlator output is offset from the optimum sampling time by 10%. (a) If the signal pulse used is rectangular, determine the loss in SNR due to mistiming. (b) Determine the amount of intersymbol interference introduced by the mistiming and determine its effect on performance. 2. (CSE: 8.7) Consider a fourphase PSK signal that is represented by the equivalent lowpass signal v ( t ) = summationdisplay n a n g ( t nT ) , where a n takes on one of the four possible values ± 1 ± j √ 2 with equal probability. The sequence of information symbols { a n } is statistically independent. (a) Determine and sketch the powerspectral density of v ( t ) when g ( t ) = braceleftbigg A, ≤ t ≤ T , otherwise (b) Repeat part (a) when g ( t ) = braceleftbigg A sin πt 2 , ≤ t ≤ T , otherwise (c) Compare the spectra obtained in parts (a) and (b) in terms of the 3dB bandwidth and the band width to the first spectral null....
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This note was uploaded on 11/13/2011 for the course ECEN 455 taught by Professor Staff during the Spring '08 term at Texas A&M.
 Spring '08
 Staff

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