Additive Noise
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Additive white Gaussian noise (AWGN) is a Channel (communications)|channel model in which the only impairment to communication is a linear addition of wideband or white noise with a constant spectral density (expressed as watts per hertz of Bandwidth (signal processing)|bandwidth) and a Gaussian distribution of amplitude. The model does not account for fading, frequency selectivity, Interference (communication)|interference, nonlinearity or Dispersion (optics)|dispersion. However, it produces simple and tractable mathematical models which are useful for gaining insight into the underlying behavior of a system before these other phenomena are considered.Wideband Gaussian noise comes from many natural sources, such as the thermal vibrations of atoms in conductors (referred to as thermal noise or Johnson-Nyquist noise), shot noise, Black body|black body radiation from the earth and other warm objects, and from celestial sources such as the Sun. The AWGN channel is a good model for many...
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