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Unformatted text preview: ECE 562 Fall 2011 October 12, 2011 EXAM 1 – 50 pts total (7:00 – 8:30 PM) Instructions : This is a closed book exam, but you are allowed to use 1 sheet of notes (8.5” × 11”; both sides). Don’t forget to put your name on the exam book. Good luck! 1. (15 pts total) True or False. Determine if the following statements are True or False. You need to provide a brief justification for your answer to get credit. (a) The complex baseband representation of √ 2 cos( πt ) sin(2 πf c t ) is cos( πt ). (b) If X and Y are zeromean proper complex random variables, then Z = X + Y is also proper complex. (c) In a linear modulation constellation, if three nearest neighbors form an equilateral triangle, it is impossible to Gray code the constellation. (d) For linear pulse amplitude modulation (PAM) on an AWGN channel, the Nearest Neighbor Approximation always gives the exact probability of error....
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 Fall '09
 pts, Quadrature amplitude modulation, V.V. Veeravalli

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