from Part II - DPD and CFR
Published online by Cambridge University Press: 07 October 2011
Introduction
Signal-to-noise ratio (SNR) is the principal figure of merit for any electronic system. The relation between the signal power and the noise power has been the main challenge for electronic engineers.
In order to study and optimize this type of system, the system design engineers have looked mainly to the noise optimization, that is, to the minimization of all sorts of noise in communication systems. This noise arises mainly from thermal noise [1], nonlinear distortion noise [2], and/or quantization noise in digital systems [3].
Thus the correct identification of the noise contributions is of fundamental importance to the calculation of the noise budget. This is one of the reasons why most of the communication engineers start by worrying about the time domain waveform characteristics of electronic systems. Mainly what they have called the peak of the signal versus its average value, or what is normally known as the peak-to-average ratio (PAR) [4] or crest factor (CF) [5].
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