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DTFT question

by l46kok
Tags: dtft
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l46kok
#1
Nov7-07, 12:52 AM
P: 296
1. The problem statement, all variables and given/known data
Compute the DTFT of the following signal.

[tex]x[n] = (0.8)^n u[n][/tex]


2. Relevant equations
Properties of DTFT


3. The attempt at a solution
Well, my professor tells me to use the properties of DTFT to solve this. I'd love to - except I don't know what the DTFT of [tex](0.8)^n[/tex] is. I've tried looking it up on the DTFT table, but couldn't find any, can someone tell me what it is?
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learningphysics
#2
Nov7-07, 11:16 AM
HW Helper
P: 4,124
It's in the DTFT pairs here:

http://www.neng.usu.edu/classes/ece/...transforms.pdf on page 20.

but maybe the prof wants you to derive it from the properties you already have in your text?


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