Noise spectral density

Noise spectral density

In communications, noise spectral density No 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 or joules. If the noise is white noise, i.e., constant with frequency, then the total noise power N in a bandwidth B is BNo. This is utilized in signal-to-noise ratio calculations.

The thermal noise density is given by No = kT, where k is Boltzmann's constant in joules per kelvin, and T is the receiver system noise temperature in kelvins.

No is commonly used in link budgets as the denominator of the important figure-of-merit ratios Eb/N0 and Es/N0.

v · d · eNoise (in physics and telecommunications)
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Noise in...
Class of noise
Engineering terms
Ratios
Carrier-to-noise ratio (C/N) · Carrier-to-receiver noise density (C/kT) · dBrnC · Eb/N0 (energy per bit to noise density) · Es/N0 (energy per symbol to noise density) · Modulation error ratio (MER) · Signal, noise and distortion (SINAD) · Signal-to-interference ratio (S/I) · Signal-to-noise ratio (S/N, SNR) · Signal to noise ratio (imaging) · Signal-to-noise plus interference (SNIR) · Signal-to-quantization-noise ratio (SQNR)
Related topics

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