What is "noise power"

n. The power of the noise in a signal.

In telecommunication, the term noise power has the following meanings:

1. The measured total noise per bandwidth unit at the input or output of a device when the signal is not present.
2. The power generated by a random electromagnetic process.
3. Interfering and unwanted power in an electrical device or system.
4. In the acceptance testing of radio transmitters, the mean power supplied to the antenna transmission line by a radio transmitter when loaded with noise having a Gaussian amplitude-vs.- frequency distribution.