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Unformatted text preview: ECE 562 Fall 2011 November 16, 2011 PRACTICE EXAM 2 1. 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) A binary DPSK system in AWGN has P b = 10 4 . It is possible to use the same power and achieve a P b 10 6 by cutting the bit rate in half. (b) The pulse x ( t ) = e t  sinc t T satisfies the Nyquist criterion for zero ISI with symbol period T . (c) The zeroforcing equalizer always maximizes the SINR at its output. (d) The Viterbi algorithm for equalization produces the MPE estimate of the trans mitted symbol sequence even when the symbols are correlated in time. (e) Z z exp z 2 4 I ( z ) dz = 2 e 2. Biorthogonal signaling. Consider the signal set with M = 2 N signals given by: s m ( t ) = E g m ( t ) m = 1 ,...,N E g m N ( t ) m = N + 1 ,...,M. where { g k ( t ) } N k =1 are orthonormal functions....
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