Noise

When modelling noise,how do they decide whether additive or multiplicative?

When modelling noise,how do they decide whether additive or multiplicative?
  1. Is noise Multiplicative or additive?
  2. Which noise is termed as multiplicative noise?

Is noise Multiplicative or additive?

In the additive noise case you can increase the signal level and get an improvement in the Signal to Noise Ratio (SNR). In multiplicative noise increase the signal (desired) signal power does get you anything in terms of signal power because the noise power is proportional to the signal power.

Which noise is termed as multiplicative noise?

In signal processing, the term multiplicative noise refers to an unwanted random signal that gets multiplied into some relevant signal during capture, transmission, or other processing. An important example is the speckle noise commonly observed in radar imagery.

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