## 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.

### Links to useful Measurements

Following are the links to other useful measurements available on Test and Measurement World website.

Difference between EVM vs subcarriers and EVM vs symbols

Current measurement vs Voltage measurement

Inductance measurement vs Capacitance measurement

Difference between Power and Energy measurements

EMC measurement vs EMI measurement

Electric and Magnetic Field Measurements

### What is difference between or comparison between

Following links mention difference or comparison between various equipments and terms:

comparison between SPI and I2C

difference between PXI and PCI

Microscope vs Telescope

Amplitude Modulation vs Angle Modulation

difference between modem and router

Air Fuel Ratio Sensor vs O2 Sensor

Radiometer vs Spectrometer vs Spectroradiometer

Clamp meter vs digital multimeter

Colorimeter vs Spectrophotometer

difference between Prism and Grating

difference between Venturi meter and Orifice meter

difference between Lux and Lumens