Power signal
In a power signal is in the signal theory to a real- or complex-valued signal s (t) with infinite signal energy , but finite average power . Formally this means:
The asterisk means the complex conjugation of the function s (t).
In the case of real-valued signals, this corresponds to the requirement
The instantaneous power of real signals at time t is calculated as follows:
Typical power signals are periodically continued energy signals such as a sine signal or a cosine signal and stochastic signals ( noise ).
No power signals are, for example, all energy signals, signals that grow exponentially over all limits or even the function .
literature
- Hans Dieter Lüke: Signal transmission . 6th edition. Springer Verlag, 1995, ISBN 3-540-54824-6 .
- Werner Rupprecht: Signals and transmission systems. Models and processes for information technology, Springer Verlag, Berlin / Heidelberg 1993, ISBN 978-3-540-56853-7 .
- Karl Steinbuch, Werner Rupprecht: communications engineering. Volume II Communication, 3rd edition, Springer Verlag, Berlin / Heidelberg 1982, ISBN 978-3-540-11352-2 .
- Uwe Kiencke, Michael Schwarz, Thomas Weickert: Signal processing. Time-frequency analysis and estimation method, Oldenbourg Verlag, Munich 2008, ISBN 978-3-486-58668-8 .
Web links
- Energy signals and power signals (accessed July 20, 2018)
- Discrete-time signals (accessed July 20, 2018)
- Signals and Systems (accessed July 20, 2018)