Signals in Natural Domain
Chapter 2 : Simple Operations and properties of Sequences
 
Power of a signal:
If {x[n]} is a signal whose energy is not finite, we define power of the signal as
$\displaystyle P_x=\lim\limits_{N\rightarrow \infty}\frac{1}{(2N+1)}\sum\limits_{n=-N}^{N}\vert x[n]\vert^2$
A signal is referred to as a power signal if the power Px satisfies the condition
$\displaystyle 0 < P_x < \infty $
An energy signal has a zero power and a power signal has infinite energy. There are signals which are neither energy signals nor power signals. For example {x[n]} defined by  x[n] = n  does not have finite power or energy.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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