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lec-sdr/a3.md
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Signal-to-Noise Ratio

is defined as some variation of \frac{P_{signal}}{P_{noise}}. In analog, e.g. radio voice communications, it thus describes how clearly the desired signal is distinguishable from noise/interference.

In digital communications, it determines the maximum possible amount of data that can be reliably transmitted as stated by the Shannon-Hartley theorem.

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