Note 1: The carrier-to-receiver noise density ratio is usually expressed in dB.
Note 2: The carrier-to-receiver noise density is given by C /kT , where C is the received carrier power in watts, k is Boltzmann's constant in joules per kelvin, and T is the receiver system noise temperature in kelvins.
Note 3: The receiver noise power density, kT , is the receiver noise power per hertz.
See also
Source: from Federal Standard 1037C and from MIL-STD-188.