In satellite communications, carrier-to-receiver noise density (C/kT) is the ratio of the power by received carrier to the density of the noise power of the receiver. It determines whether a receiver can lock on to the carrier and if the information encoded in the signal can be retrieved, given the amount of noise present in the received signal. The carrier-to-receiver noise density ratio is usually expressed in dBHz.
The carrier-to-receiver noise density is given by
where C is the received carrier power in watts, k is Boltzmann constant in joules per kelvin, and T is the receiver system noise temperature in kelvins. The receiver noise power density, kT, is the receiver noise power per hertz.
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