(i)Noise figure

(ii)Noise temperature

(iii)Noise bandwidth

(iv)Noise voltage

(v)Modulation

Mumbai University > Information Technology > Sem 3 > Principles of analog and digital communication

Marks:- 5M

Year:- May 2016

(i)Noise figure:

• Sometimes the noise factor is expressed in decibels. When noise factor is expressed in decibels it is called noise figure.

• Noise figure = $F_{dB}$=10 $log_{10}$F………..(1)

• Substituting the expression for the noise factor we get

  Noise figure =10 $log_{10}$[(S/Nat the input)/(S/Nat the output) ]

  =10$log_{10}$ $(S/N)_i$ - 10 $log_{10}{(S/N)_o}$ …