SNR represents signal-to-noise (power) ratio. The mathematical relation is given by

\mathrm{SNR} = \frac{P}{N}

where P and I are the signal power and the noise power, respectively. SNR is the key input parameter for the channel capacity. If we consider the interference power, we can use SINR which is give by

\mathrm{SNR} = \frac{P}{I + N}

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