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In communications, noise spectral density … In communications, noise spectral density (NSD), noise power density, noise power spectral density, or simply noise density (N0) is the power spectral density of noise or the noise power per unit of bandwidth. It has dimension of power over frequency, whose SI unit is watt per hertz (equivalent to watt-second or joule). It is commonly used in link budgets as the denominator of the important figure-of-merit ratios, such as carrier-to-noise-density ratio as well as Eb/N0 and Es/N0. If the noise is one-sided white noise, i.e., constant with frequency, then the total noise power N integrated over a bandwidth B is N = BN0 (for double-sided white noise, the bandwidth is doubled, so N is BN0/2). This is utilized in signal-to-noise ratio calculations. For thermal noise, its spectral density is given by N0 = kT, where k is the Boltzmann constant in joules per kelvin, and T is the receiver system noise temperature in kelvins. The noise amplitude spectral density is the square root of the noise power spectral density, and is given in units such as .l density, and is given in units such as .
, En télécommunications et en électronique, … En télécommunications et en électronique, la densité spectrale de bruit se définit comme la densité de bruit présente dans un signal, rapporté à une bande passante de 1 Hz. On distingue la densité de puissance, exprimée en V²/Hz, de la densité de tension, exprimée en V/√Hz. La densité spectrale de bruit est généralement utilisée pour spécifier les exigences de bruit d'un composant ou d'un système électronique.un composant ou d'un système électronique.
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En télécommunications et en électronique, … En télécommunications et en électronique, la densité spectrale de bruit se définit comme la densité de bruit présente dans un signal, rapporté à une bande passante de 1 Hz. On distingue la densité de puissance, exprimée en V²/Hz, de la densité de tension, exprimée en V/√Hz. La densité spectrale de bruit est généralement utilisée pour spécifier les exigences de bruit d'un composant ou d'un système électronique.un composant ou d'un système électronique.
, In communications, noise spectral density … In communications, noise spectral density (NSD), noise power density, noise power spectral density, or simply noise density (N0) is the power spectral density of noise or the noise power per unit of bandwidth. It has dimension of power over frequency, whose SI unit is watt per hertz (equivalent to watt-second or joule). It is commonly used in link budgets as the denominator of the important figure-of-merit ratios, such as carrier-to-noise-density ratio as well as Eb/N0 and Es/N0.-density ratio as well as Eb/N0 and Es/N0.
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Densité spectrale de bruit
, Noise spectral density
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