Digital Communications
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Noise in Communication Systems
Noise in communication systems limits transmission rates and makes signals harder to decode. This article explains thermal noise, Gaussian and white noise models, and signal-to-noise ratio (SNR).
The term noise refers to unwanted electrical signal in electrical systems. This unwanted signal masks the information signal, limiting the transmission rate and affecting the receivers ability to make the correct symbol decision.
In communication systems noise arises due to different sources, these sources can be classified in two categories:
- Natural noise:
- Atmospheric noise.
- Noise from the sun.
- Other galactic radiation sources.
- Man-made noise:
- Ignition noise.
- Radiating electromagnetic signals.