HW5 prob5

Say we set the carrier frequency to fc 12 khz then

This preview shows page 1. Sign up to view the full content.

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

Unformatted text preview: the positive frequency part of the magnitude of the DFT of x vs. CT frequency f, and verify that the signal has CT bandwidth B = 5 kHz. (b) Increasing the sample rate to avoid aliasing: In order to simulate AM we need to use a carrier frequency > 2B = 10 kHz. Say we set the carrier frequency to fc = 12 kHz. Then the highest frequency in the AM signal is 12+5 = 17 kHz, so to avoid aliasing in the AM signal we need a sample rate of at least 34 kHz. But we are going to use an envelope detector receiver. Recall from class that this nonlinear system generates harmonics of the input frequency, so at the envelope detector output we will see terms at center frequencies 0, 12 kHz, 24 kHz, 36 kHz, etc. We have to sample fast enough that the harmonics do not cause significant aliasing in the signal at the receiver output. Harmonics beyond the third (that is, the term with center frequency 36 kHz) are quite small...
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 ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’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 ‘17, Course Hero Intern

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

Jill Tulane University ‘16, Course Hero Intern