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Other Considerations
Receive Sensitivity - the minimum received energy before a receiver can process the signal at a given rate, a typical number might be -80dBm to -89dBm (-80dBm is .00000001 Watt)
Noise Floor - The level of background noise and interference from other sources in the same or adjacent frequency ranges.
SNR – Signal to Noise Ratio. Typically this comes into play when you measure the difference between the received signal and the noise floor. If the Noise floor is below the minimum receive sensitivity the SNR is not a significant concern. SNR is normally expressed as the difference between the received signal and the noise floor in dB rather than as a fraction since it's easier to use in link budge calculations.