Examine why noise temperature is a useful concept in communication receiver

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Noise temperature is a measure of the noise entering a receiver through antenna. Noise temperature provides a way of determining how much thermal noise is generated by active and passive devices in the receiving system.

Generally, at the receiver side, the noise temperature should be maintained as low as possible, Front-end amplifier is immersed in liquid helium to maintain its physical temperature around 4 K. It is practiced in large earth stations. 

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