How do you calculate the minimum discernable signal?

The minimum discernable signal (MDS) can be calculated using the formula ( MDS = \text{noise level} + \text{signal-to-noise ratio (SNR)} ). The noise level represents the baseline level of noise in the system, while SNR is the ratio of the desired signal's power to the noise power. By ensuring that the signal power exceeds the noise level by a certain SNR threshold, you can determine the smallest signal that can be reliably detected. Typically, a minimum SNR of about 1 (or 0 dB) is needed for a signal to be discernible.