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Implementing Cisco Networking Solutions by Harpreet Singh

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Signal to Noise Ratio (SNR)

There are multiple sources of radiation around us. These include electronic devices, a spark in electrical circuits or clouds, thermal devices, and even signals from the stars and clouds. These unwanted signals are called noise and they distort the original modulated signal that was transmitted by the RF source. Noise causes the signal to degrade and makes it difficult for the receiver to decipher the information from the modulated wave once it is received.

The ratio of ambient noise is typically measured as a ratio of the signal power received at a point to the power of the noise signals. The signal to noise ratio, also known as SNR, is also expressed in dB as a unit, as follows:

Figure 2: Calculating SNR

SNR ...

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