Question
Which probability distribution is most widely used to
model channel noise in pulse code modulation?Solution
In PCM systems, the channel noise mainly comes from thermal noise, which is the result of random motion of electrons in conductors and electronic devices. By the central limit theorem, the sum of many small random effects tends to follow a Gaussian (normal) distribution. That’s why Gaussian distribution is the most accurate and widely used model for channel noise in digital communication systems.
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