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SNR (signal power)/(noise power)
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Noise: thermal noise
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SIR (Signal-to-Interference)
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(signal power)/(interference power)
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Sometimes known as C/I (carrier-to-interference ratio)
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Interference: signals from other simultaneous
communications
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SINR ( Signal-to-Interference-Plus-Noise ratio)
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(signal power)/(interference power+noise power)
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