Which two measurements are required to compute signal‑to‑noise ratio (SNR)?
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Correct answer: noise floor, RSSI.
Why this is the answer
Signal-to-noise ratio (SNR) is a measure used to compare the level of a desired signal to the level of background noise. It is calculated by subtracting the noise floor from the Received Signal Strength Indicator (RSSI). Therefore, both RSSI and the noise floor are required measurements. RSSI indicates the strength of the received signal, which includes both the desired signal and any noise. The noise floor represents the power level of the ambient background noise. Transmit power and Equivalent Isotropically Radiated Power (EIRP) relate to the signal's strength at the source or after antenna gain, not the received signal or noise at the receiver. Antenna gain is a component of EIRP but doesn't directly measure the received signal or noise.
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