July 2003
Intermediate to advanced
576 pages
11h 51m
English
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2.3. Noise Model
2.3.1. Noise Power and Power Spectrum Density
The severity of a particular noise can be measured from its power level or its power density level. The magnitude of a noise can be as high as a few tens of microvolts. The noise power is usually expressed in decibels (dbm), which is defined as
Equation 2.48
where v is the average voltage of the noise, R = 100 is the receiver input impedance, and Pm = 0.001 is the reference of 1 milliwatt (mW). The noise power spectrum density (PSD) is usually expressed in decibels per hertz (dBm/Hz), which is defined as
Equation 2.49
where B is the bandwidth of noise of particular interest measured ...
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