Chapter 2
Signal and Linear System Theory
2.1 Problem Solutions
Problem 2.1 For the single-sided spectra, write the signal in terms of cosines: x(t) = 10 cos(4t + /8) + 6 sin(8t + 3/4) = 10 cos(4t + /8) + 6 cos(8t + 3/4 - /2) = 10 cos(4t + /8) + 6
Chapter 5
Random Signals and Noise
5.1 Problem Solutions
Problem 5.1 The various sample functions are as follows. Sample functions for case (a) are horizontal lines at levels A, 0, -A, each case of which occurs equally often (with probability 1/3).
Chapter 4
Probability and Random Variables
4.1 Problem Solutions
Problem 4.1 S = sample space is the collection of the 25 parts. Let Ai = event that the pointer stops on the ith part, i = 1, 2, ., 25. These events are exhaustive and mutually exclus
Chapter 3
Basic Modulation Techniques
3.1 Problems
Problem 3.1 The demodulated output, in general, is yD (t) = Lp{xc (t) 2 cos[ c t + (t)]} where Lp {} denotes the lowpass portion of the argument. With xc (t) = Ac m (t) cos [ c t + 0 ] the demodul