Integration in Frequency Domain

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Homework Help Overview

The discussion revolves around the integration of a complex function in the frequency domain, specifically the integral $$\int_{-0.5}^{0.5} {\bigg({\frac{1}{4-2e^{-j2{\pi}f}}}\bigg)}^2 df$$. Participants are exploring the context of this integral within the framework of discrete-time Fourier transform (DTFT) signals.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the nature of the integral, questioning the integration of a complex function over the real axis. There are mentions of integration techniques, such as integration by parts, and the implications of finding the energy of a DTFT signal. Some participants express confusion about the characteristics of the energy signal and its expected outcome.

Discussion Status

The discussion is ongoing, with participants providing hints and questioning assumptions. There is an exploration of potential substitutions for simplifying the integral, indicating a collaborative effort to understand the problem better. However, no consensus or resolution has been reached yet.

Contextual Notes

Participants note the importance of understanding the problem statement and the context of the DTFT signal, as well as the implications of integrating a complex function. There is an acknowledgment of the need for personal effort in solving the problem, in line with forum guidelines.

yukari1310
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How to integrate $$\int_{-0.5}^{0.5} {\bigg({\frac{1}{4-2e^{-j2{\pi}f}}}\bigg)}^2 df$$
 
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Homework Statement



Homework Equations



The Attempt at a Solution


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Hello again; must be you forgot how PF homework sections work: you are supposed to make an effort yourself.
In the mean time I do wonder where this comes from and what the problem statement really is: you now seem to be wanting to integrate a complex function over a section of the real axis ?
 
I did try it somewhere else using integration by parts but the function to be integrate just got more complicated as I go on.
I am suppose to find the energy signal of a DTFT [ie X(f)] signal. The range defined is over the principal period of the DTFT signal.
 
Isn't the energy a real number ?
 
Yeah? So can you give me some hints on how to integrate the complex function?
 
I would think a rather obvious substitution would be [itex]u= 4- 2e^{j2\pi f}[/itex]. Did you try that? What do you get?
 

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