What does noise power is assumed to be the same at all nodes

1. What is meant by noise power?
2. How do you calculate noise power?
3. What is signal power and noise power?

What is meant by noise power?

In telecommunication, the term noise power has the following meanings: The measured total noise in a given bandwidth at the input or output of a device when the signal is not present; the integral of noise spectral density over the bandwidth. The power generated by a random electromagnetic process.

How do you calculate noise power?

At the system output the power of this noise is measured in the channel under test. The noise generator spectrum is then notched at the frequency of the channel under test. At the system output, the residual noise power is measured in the channel under test. The ratio of these two readings is the Noise Power Ratio.

What is signal power and noise power?

Signal-to-noise ratio is defined as the ratio of the power of a signal (meaningful input) to the power of background noise (meaningless or unwanted input): where P is average power. Both signal and noise power must be measured at the same or equivalent points in a system, and within the same system bandwidth.