Revision as of 04:23, 13 January 2011 by Rgieseck (Talk | contribs)

Compute the energy $ E_\infty $ and the power $ P_\infty $ of the following discrete-time signal

$ x[n]= j  $

What properties of the complex magnitude can you use to check your answer?


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Answer 1

$ \begin{align} E_{\infty}&=\lim_{T\rightarrow \infty}\sum_{n=-T}^T |j|^2 &= \lim_{T\rightarrow \infty}\sum_{n=-T}^T {(\sqrt{jj*})}^2 &= \lim_{T\rightarrow \infty}\sum_{n=-T}^T {(\sqrt{-j^2})}^2 & = \lim_{T\rightarrow \infty}\sum_{n=-T}^T 1 &=\infty. \end{align} $

So $ E_{\infty} = \infty $.


--Rgieseck 21:35, 12 January 2011

Answer 2

write it here.

Answer 3

write it here.


Back to ECE301 Spring 2011 Prof. Boutin

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