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noise spectral density
In communications, noise spectral density ''N''0 is the noise power per unit of bandwidth; that is, it is the power spectral density of the noise. It has dimension of power/frequency (see dimensional analysis), whose SI coherent unit is watts per hertz, which is equivalent to watt-seconds. If the noise is one-sided white noise, i.e., constant with frequency, then the total noise power ''N'' in a bandwidth ''B'' is ''BN''0. For double-sided white noise, this is doubled, so ''N'' is ''BN''0/2. This is utilized in signal-to-noise ratio calculations.
The thermal noise density is given by ''N''0 = ''kT'', where k is Boltzmann's constant in joules per kelvin, and ''T'' is the receiver system noise temperature in kelvins.
''N0'' is commonly used in link budgets as the denominator of the important figure-of-merit ratios ''E''''b''/''N''0 and ''E''''s''/''N''0.
==References==
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