Problem4) The lowpass equivalent representation of a PAM signal is u(t) = Ing(t – nT) Suppose g(t) is a rectangular pulse and I, = a, – an-2 where (a,} is a sequence of uncorrelated binary-valued (1,...

Extracted text: Problem4) The lowpass equivalent representation of a PAM signal is u(t) = Ing(t – nT) Suppose g(t) is a rectangular pulse and I, = a, – an-2 where (a,} is a sequence of uncorrelated binary-valued (1, -1) random variables that occur with equal probability. 1. Determine the autocorrelation function of the sequence {I,}. 2. Determine the power density spectrum of u(t). 3. Repeat (2) if the possible values of the a, are (0, 1).