# Noise Spectral Density(N0),Carrier to Noise Spectral Density Ratio(C/N0)

This page describes Noise Spectral Density(N0) vs Carrier to Noise Spectral Density Ratio(C/N0). It mentions basic difference between N0 (Noise Spectral Density) and C/N0(Carrier to Noise Spectral Density Ratio).

## Noise Spectral Density( N0 )

• It is defined as amount of (white) noise energy per bandwidth unit (Hz).

➤ N0 = N/B

• It can also be expressed as follows.

➤ N0 = K*T

Where,

K = Boltzmann's constant in J/K

T = Receiver system noise temperature in K

• Units of No are Joules (J) or Watts/Hz or Watts*s.

## Carrier to Noise Spectral Density Ratio( C/N0 )

• It is the ratio of power level to noise power spectral density (i.e. normalized noise
level relative to 1 Hz) in a system.

• C/N0 is similar to C/N but it does not factor the actual noise bandwidth.

• It simplifies analysis of systems where variation of (utilized) BW may apply.

• Both C/N ratio and C/N0 are determined using BER plots or BER meters.

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