Signal power refers to the strength or magnitude of the desired signal in a system, while noise power refers to the unwanted interference or random fluctuations present in the system.
To calculate signal power, you can use the formula P = V^2/R, where P is the power in watts, V is the voltage in volts, and R is the resistance in ohms. You can also use a power meter to measure the power directly.
Noise power can be measured using a spectrum analyzer or a noise power meter. These devices measure the power of the noise in a specific frequency range.
The signal-to-noise ratio is the ratio of the signal power to the noise power. It is used to measure the quality of a signal and is often expressed in decibels (dB).
The SNR can be calculated using the formula SNR = 10log(Psignal/Pnoise), where Psignal is the signal power and Pnoise is the noise power. This calculation is based on the logarithmic scale of decibels.