This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "Additive white Gaussian noise" – news · newspapers · books · scholar · JSTOR(February 2020)
Additive white Gaussian noise (AWGN) is a basic noise model used in information theory to mimic the effect of many random processes that occur in nature. The modifiers denote specific characteristics:
Additive because it is added to any noise that might be intrinsic to the information system.
White refers to the idea that it has uniform power spectral density across the frequency band for the information system. It is an analogy to the color white which may be realized by uniform emissions at all frequencies in the visible spectrum.
Gaussian because it has a normal distribution in the time domain with an average time domain value of zero (Gaussian process).
Wideband noise comes from many natural noise sources, such as the thermal vibrations of atoms in conductors (referred to as thermal noise or Johnson–Nyquist noise), shot noise, black-body radiation from the earth and other warm objects, and from celestial sources such as the Sun. The central limit theorem of probability theory indicates that the summation of many random processes will tend to have distribution called Gaussian or Normal.
AWGN is often used as a 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) and a Gaussian distribution of amplitude. The model does not account for fading, frequency selectivity, interference, nonlinearity or 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.
The AWGN channel is a good model for many satellite and deep space communication links. It is not a good model for most terrestrial links because of multipath, terrain blocking, interference, etc. However, for terrestrial path modeling, AWGN is commonly used to simulate background noise of the channel under study, in addition to multipath, terrain blocking, interference, ground clutter and self interference that modern radio systems encounter in terrestrial operation.
and 20 Related for: Additive white Gaussian noise information
AdditivewhiteGaussiannoise (AWGN) is a basic noise model used in information theory to mimic the effect of many random processes that occur in nature...
representation of whitenoise). In particular, if each sample has a normal distribution with zero mean, the signal is said to be additivewhiteGaussiannoise. The...
channel testing and modelling, Gaussiannoise is used as additivewhitenoise to generate additivewhiteGaussiannoise. In telecommunications and computer...
that consists of an unknown constant A {\displaystyle A} with additivewhiteGaussiannoise (AWGN) w [ n ] {\displaystyle w[n]} with zero mean and known...
Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition...
make them susceptible to noise. Noise can be random with an even frequency distribution (whitenoise), or frequency-dependent noise introduced by a device's...
of intensity values from nearby pixels. This weight can be based on a Gaussian distribution. Crucially, the weights depend not only on Euclidean distance...
constant. Then denoising algorithms designed for the framework of additivewhiteGaussiannoise are used; the final estimate is then obtained by applying an...
small to moderate levels of Gaussiannoise, the median filter is demonstrably better than Gaussian blur at removing noise whilst preserving edges for...
non-spread-spectrum system with the same modulation format. Thus, on an additivewhiteGaussiannoise (AWGN) channel without interference, a spread system requires...
structure Non-systematic convolutional codes are more popular due to better noise immunity. It relates to the free distance of the convolutional code. A short...
symbols to match the channel. In a channel corrupted by an additivewhiteGaussiannoise (AWGN), this implies transmitting low-energy signals more frequently...
channel impairments: Noise model, for example AdditivewhiteGaussiannoise (AWGN) channel, a linear continuous memoryless model Phase noise model Interference...
until 1953 Shaoyang Wugang Airport, IATA code WGN WhiteGaussiannoiseAdditivewhiteGaussiannoise The ICAO airline designator for Western Global Airlines...
the channel capacity concept to an additivewhiteGaussiannoise (AWGN) channel with B Hz bandwidth and signal-to-noise ratio S/N is the Shannon–Hartley...
A noise barrier (also called a soundwall, noise wall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect inhabitants...
Noise pollution, or sound pollution, is the propagation of noise or sound with ranging impacts on the activity of human or animal life, most of which are...
Noise health effects are the physical and psychological health consequences of regular exposure to consistent elevated sound levels. Noise from traffic...
increasing the distance between source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping...
transmission channel) AdditivewhiteGaussiannoise (AWGN) channel without fading. A worst-case scenario is a completely random channel, where noise totally dominates...
Global Information