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A discrete signal or discrete-time signal is a time series consisting of a sequence of quantities.

1
vote
Well, for a signal $x[k]$, the energy is: \begin{equation} E=dt*\sum_{k=-\infty}^{\infty}x^2[k] \end{equation} You want the energy to be one by dividing $x[k]$ through a value $a$, hence: \begin{equa …
answered Jun 21 '14 by jan
11
votes
Depends on what you are controlling. For DC-motors it is the inertia of the device that acts as a low-pass filter of the PWM modulated signal resulting in a continuous motion. For most LEDs it is the …
answered Jul 22 '13 by jan
1
vote
No, that is not true. It is \begin{equation} |a+b| \leq |a| + |b| \end{equation} Edit: This is not true for the power which was asked for by the OP (see the comments). I over-read the re-definition …
answered Feb 12 '14 by jan
4
votes
There is no general formula to calculate time constants for all signals. Time constants are defined for some signals. For your exponential signal \begin{equation} e^{-a \cdot t} = e^{-t / c} \end{equ …
answered Nov 20 '13 by jan
6
votes
Unfortunately you did not mention what your channel is so I assume that merely AWGN is present. Furthermore I assume symbol-by-symbol detection is desired since a decoder for the Hammingcode is follow …
answered Aug 7 '13 by jan