# s2 - c Does the pulse in b have a wider or a narrower...

This preview shows pages 1–2. Sign up to view the full content.

Cmpen/EE 362 Asst. 2 Solution Spring 2011 Problem 1 . a) Text, problem 2.22. 4 (Fig. 2-25) or 5 (Fig. 2-23) edition. b) Also answer the bps for th th the 64-QAM system. Modem constellation has points, (1,1), (1,-1),(-1,1).(-1,-1) At 1200 symbols per second, how many bits per second can modem achieve? Solution. a) 2 bits per pulse, so 2*1200 = 2400 bits/second. b) 2 = 64, so 6 bits per pulse, so 7200 bits/second. 6 Problem 2. The Fourier Transform relates a signal’s time shape to its frequency content. The Fourier relation Time function Fourier transform is called the scale change property. a) Draw a triangle pulse, called p(t), versus t, that extends in time from t = -1 to t = 1 and peaks with magnitude 1 at t=0. b) Draw the triangular pulse p(3t) versus t, showing key magnitude and time parameters.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: c) Does the pulse in b) have a wider or a narrower bandwidth than the pulse in a)? Solution. a) Use Ã« for t. A function p( ) defines its value in terms of what is in the parentheses. b) The function p(3t) falls to zero when 3t = Â±1, t = Â±1/3 c) The pulse in b) is 1/3 as wide, and requires 3 times the bandwidth. Problem 3 The theoretical channel capacity C relating to bandwidth H, signal power S, and noise power density N /2 is Suppose that at H = 2 megaherz the capacity is 4 megabits/second. If the bandwidth is doubled with no change in S and N , what is the new capacity? Aid for calculating base 2: Solution....
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business â€˜17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. Itâ€™s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania â€˜17, Course Hero Intern

• The ability to access any universityâ€™s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLAâ€™s materials to help me move forward and get everything together on time.

Jill Tulane University â€˜16, Course Hero Intern