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Define noise figure and noise factor

Subject: Priniciples of Communication Engineering

Difficulty : Medium

Marks : 05

1 Answer
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Noise factor (f)

It is defined as ratio of signal to noise ratio at the input to signal to noise ratio at the output of the receiver. Ideally value of F is 1 for a receiver. SNR at the input is always higher than SNR at the output hence practically noise factor will be greater than 1.

Noise factor (f) = SNR at the inputSNR at the output

Noise figure (NF)

If the noise factor is expressed in decibels then it is called noise figure (NF)

NF = 10 log (Noise Factor)

NF = 10 log SNR at the inputSNR at theoutput

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