2015 Spring: The Second Midterm of Digital Communications
The total points of this exam is 110.
1.
The above figure shows an equivalent channel model with channel transfer function C` (f ) bandlimited to W and random, and zW (t) bandlimited white noise. I

2015 Spring: The Second Midterm of Digital Communications
The total points of this exam is 130.
1. Suppose the complex-valued baseband output r ` is equal to the sum of channel input sm,`
and noise n` , and suppose there are M possible channel inputs to b

2015 Spring: The Second Midterm of Digital Communications
The total points of this exam is 110.
1.
The above figure shows an equivalent channel model with channel transfer function C` (f ) bandlimited to W and random, and zW (t) bandlimited white noise. I

2015 Spring: The First Midterm of Digital Communications
The total points of this exam is 112.
1. For a given x` (t), define x(t) = Re x` (t)e 2f0 t and x(t) = Im x` (t)e 2f0 t . Assume the
Fourier transform of x` (t) is the figure shown below, where

2015 Spring: The First Midterm of Digital Communications
The total points of this exam is 112.
1. For a given x` (t), define x(t) = Re x` (t)e 2f0 t and x(t) = Im x` (t)e 2f0 t . Assume the
Fourier transform of x` (t) is the figure shown below, where

2015 Spring: The Second Midterm of Digital Communications
The total points of this exam is 130.
1. Suppose the complex-valued baseband output r ` is equal to the sum of channel input sm,`
and noise n` , and suppose there are M possible channel inputs to b